Changelog

All notable changes to this project will be documented in this file.

This project adheres to Semantic Versioning.

For Helidon 1.x releases please see Helidon 1.x CHANGELOG.md

2.4.1-SNAPSHOT

This is a bugfix release of Helidon.

Compatibility

2.4.1 is API compatible with 2.3.0.

CHANGES

2.4.0

This is a minor release of Helidon. It contains bug fixes and enhancements. Some key new features:

MicroProfile Long Running Actions (LRA) (experimental)
Configuration profiles
MicroStream Integration: thanks to the MicroStream team for this contribution!
OCI ATP integration and OCI service health checks
Oracle UCP 21.3 native image support
JEP 290 serialization filtering checks
Open IdConnect improvements
Java 17 support
Numerous dependency upgrades

Compatibility

2.4.0 is API compatible with 2.3.0. There has been a change that might impact a small number of our users:

YamlMpConfigSource has been moved to module io.helidon.config:helidon-config-yaml-mp. This is due to wrong JPMS definition where we could not provide a service of an optional dependency. To fix the dependency graph (so we do not depend on MP config from SE config), we had to create a new module. If you use this class directly, please update your dependencies (this may not be required, as it is on classpath of all MP applications), and change the package to io.helidon.config.yaml.mp.

Thanks!

Thanks to the following community members for contributing fixes or enhancements to this release:

@MicroStream
@Captain1653
@duplexsystem
@zimmi

CHANGES

WebSocket: Remove use of synchronized Tyrus integration 3566
WebServer: add io_uring support (experimental) 3460
WebServer: Support wildcard in path template. 3559
WebServer: Request correlation 3426
WebServer: Removes compiler warnings (that can be removed) from the webserver project 3424
WebServer: Introduces a Transport implementation for epoll (experimental) 2732
WebServer: Fluent headers. 3399
WebServer: Fix race condition when analysing whether entity is fully read when … 3425
WebServer: Fix issue when Netty server hangs when under load. 3430
WebServer: Fix for prematurely closed connections blocking threads indefinitely 3365
WebServer: Correctly handling custom reason phrase of status 3464
WebServer: Close connection with ServerRequest 3380
WebServer: Bad request handler. 3553
WebServer: Adds maxShutdownTimeout and shutdownQuietPeriod parameters to WebServer and associated classes 3422
WebServer and WebClient race conditions fixed 3264
WebClient: WebClient now throws WebClientException when channel gets closed 3427
WebClient: Set HTTP as default proxy type when specified via config in WebClient 3551
WebClient: OCI Rest API fix security service in webclient 3352
WebClient: Also relativize request URI if host is in no-host list 3442
WebClient HTTP to HTTPS request hang fix 3305
Upgrades Eclipselink to 2.7.9 3429
Tracing: Zipkin span can now be registered as active span. 3346
Tracing: Using Jersey context rather then Helidon context. 3403
Tracing: Modified Jaeger logic to not close scopes before switching threads 3207
Tests: smoketest: enable native-image tests. Minor tweaks. 3237
Tests: Updated tests to use @HelidonTest 3262
Tests: PrematureConnectionCutTest MacOS fix 3408
Tests: Jaeger metrics test 3190
Tests: Improve async test checking KPI metrics 3347
Tests: Handle potential connection reset conditions in test 3360
Tests: Fix scheduling test RC 3308
Tests: Fix micrometer test 3234
Tests: Bookstore test: use new port number each time application is run 3555
Tests: Added logging to test to debug failures in our pipeline 3312
Tests: Add test-native-image.sh 3386
Tests: Add JUnit profiles #3115 3391
Test: Intermittent issue fix 3471
Serailization: JEP-290, SerialConfig support 3201
Security: OIDC redirect host 3584
Security: Signed JWT should use base64 with no-padding when creating a token. 3419
Security: OIDC logout 3456
Security: OIDC config Refactoring 3277
Security: Integration test and doc update for optional flag support on auth providers 3191
Security: Gracefully handle case where JsonWebToken is injected and JwtAuth pro… 3326
Security: Fix NPE in outbound of JWT provider. 3295
Reactive: Single.onCompleteResumeWithSingle 3329
Reactive: Single.log operator 3544
Reactive: Multi ifEmpty 3470
Reactive: Multi flatMapOptional 3387
Reactive: Multi flatMapCompletionStage 3339
Reactive: Fix await duration nanos conversion 3366
Reactive: BEP refactor ver2 3232
Reactive: BEP - defensive copy of onRequest callback 3376
Reactive: Await with duration 3335
OCI: OCI ATP Integration 3236 3369 3439 3477
OCI: Health check for OCI vaults 3299
OCI: Enhancements to OCI health checks 3404
Native image: Sse injection native-image compatible 3343
Native image: Replace reflect-config.json with @Reflected in examples 3576
Native image: Fix lock condition in initalization when building native image. 3432
Native image update 3208
Microstream: Microstream integration - contributed 3355
MicroProfile: Fix "Startup logging refactoring #2660" 3356
Metrics: Use FQCN instead of simple names when registering annotated types explicitly 3415
Metrics: Set correct metric type in metadata for the Hikari metrics 3445
Metrics: Native-image regression fix 3342
Metrics: Improve some interceptor code paths in metrics 3251
Metrics: Fixes an edge-case issue with possible duplicate bean registrations in MP metrics 3410
Metrics: Fix bad warning message during PeriodicExecutor shutdown 3406
Metrics: Fix Prometheus formatting errors 3453
Metrics: Fix Issue: Implement toString in each concrete metric implementation 3349
Metrics: Defer creation of current-time-in-seconds thread until runtime 3385
Metrics: Declare correct metric type in DbClient metrics classes 3446
Metrics: Change Micrometer integration to use MP config and use runtime, not build-time, config 3311
Metrics: Avoid exemplar labels such as {} 3266
Metrics: Allow metrics-capable components to work in absence of full-featured metrics 3441
Metrics: Allow HelidonConcurrentGauge to use a Clock; update test to avoid real waits 3348
Metrics: Allow disabling of metrics by registry type and/or name patterns 3573
Metrics: Adds MicroProfile Metrics to Hikari CP 2826
Metrics: Add the KPI metrics handler (with no qualifying path) exactly once to each routing 3255
Metrics and routings 3260
Messaging: SE Messaging log unhandled errors 3271
Messaging: 3287 SE Messaging doesn't create default config 3337
MP: Use MP config instead of Config.create() in MP components. 3290
MP Server: Print https when TLS is enabled in MP. 3322
MP LRA: remove synchronized 3561
MP FT: Replaced synchronized by reentrant locks in MP FT 3565
Loom (experimental): Support for newer Loom builds 3467
LRA: MicroProfile Long Running Actions (experimental) 3016
Java 17: Fix tests and other for Java 17 3416
Java 17: Fix TCK tests to run with Java 17 3421
JAX-RS: New injection manager for Helidon 3245
JAX-RS: Avoid double caching by calling Application methods in ResourceConfig 3340
JAX-RS: Automated discovery of JAX-RS method entities. 3358
Health: Make sure our built-in MP health checks are marked as built in 3315
GraphQL: Enable DataFetchingEnvironment as part of @GraphQLApi @Query methods 3204
FT: Propagate supplier exceptions even on a timeout in FT 3449
FT: Migration of CDI contextual beans into new threads 3332
FT: Explicitly destroy bean instance obtained from CDI object 3214
Examples: Use try-with-resources with Response's in examples and quickstarts 3259
Examples: Upgrade jquery to 3.5.0 in todo example 3221
Examples: Update GraphQL MP Example to include metrics 3196
Examples: Race condition in Microstream example. 3420
Examples: Example reactive code usage update. 3213
Examples: Cover todo app with tests 2784
Docs: Update metrics typo 3229
Docs: Uncommented external links. 3321
Docs: OpenTracing add missing documentation 3368
Docs: New section describing Helidon/JAX-RS integration 3554
Docs: Minor config doc update 3293
Docs: Javadoc update: external links and package-list/element-list updates 3333
Docs: JavaDoc lint warning cleanup 3336
Docs: Helidon config documentation updates 3187
Docs: Guide for Testing with JUnit5 3005
Docs: Documentation for OCI Object Storage health checks 3181
Docs: Documentation MP: OIDC Postman extension 3179
Docs: Doc fix to address adding long running code in hooks 3226
Docs: Doc Fix for Issue 3175- OCI Vault image error 3224
Docs: Added prereqs to each guide se/mp 3168
Dependencies: Use MP OpenAPI 1.2 and adapt to SmallRye OpenAPI 2.0.26 which supports it 3294
Dependencies: Uptake ojdbc 21.3 drivers with native image support 3384
Dependencies: Upgrading to the latest Jersey 2.35 3397
Dependencies: Upgrades Narayana to 5.12.0.Final and deprecates now-redundant classes for removal 3296
Dependencies: Upgrades HikariCP to version 5.0.0. 3257
Dependencies: Upgraded Jandex to 2.3.1.Final and jandex-maven-plugin to 1.1.0 3270
Dependencies: Upgraded Hibernate to 5.5.7.Final. 3417
Dependencies: Upgraded H2 to 1.4.200 3256
Dependencies: Upgrade typesafe-config to 1.4.1 3253
Dependencies: Upgrade slf4j to 1.7.32 3560
Dependencies: Upgrade jaeger-client to 1.6.0 3233
Dependencies: Upgrade google-api-client to 1.32.2 3563
Dependencies: Upgrade brave-opentracing to 1.0.0 3252
Dependencies: Upgrade GraalVM to 21.3.0 3578
Dependencies: Removes duplicate JTA API jars where appropriate 3317
Dependencies: Remove bad javax.injects exclusion 3325
Dependencies: Moved some dependencies into test scope only in helidon-webserver-tyrus 3412
Dependencies: Micronaut upgrade 3548
Dependencies: Kafka client 2.8.1 bump up 3538
Dependencies: Direct dependency for reactive streams api 3268
DependencieS: Upgrades Jedis to 3.6.3 3302
DependencieS: Upgrade org.glassfish:jakarta.el to 3.0.4 3330
DataSource: Permits datasources to be arbitrarily customized before becoming beans, following the practice of other extensions 3390
DataSource: Adds support for the limited customization and configuration permitted by the UCP 3450
DataSource: Adds integrations for pseudo-XA datasources 3089
DBClient: relax named parameter identifier rules and fix #2922 3473
Config: SE Config Profiles 3113
Config: Fix JPMS and Maven dependency issue with MP Config in YAML module 3117
Config: Configuration annotation processor. 3250
Config: Added support for multiple URIs to Config Etcd API 3381
Config now registered before container initialization. 3292
Common: Using StandartCharsets and removing UnsupportedEncodingException 3479
Common: Remove uses of SecurityManager and AccessController dependencies 3440
CORS: Fix missing CORS headers if response has 404 status 3206
Build: Specifies the explicit version of the JDK in the Helidon build pipelines 3267

2.3.4

This is a bug fix release of Helidon. It contains bug fixes. We recommend all Helidon 2.x users upgrade to this release.

Compatibility

2.3.4 is API compatible with 2.3.0.

CHANGES

WebServer: Fix issue when Netty server hangs when under load. 3435
WebServer: Fix race condition when analysing whether entity is fully read 3434
Webclient: Relativize request URI if host is in no-host list, in addition to the no-proxy case. 3442
Tracing: Using Jersey context rather then Helidon context. 3436
Metrics: PeriodicExecutor can incorrectly log warning message; and warning text can be wrong 3433
Metrics: native-image build fails due to metrics performance optimization 3433
Grpc: Enable DataFetchingEnvironment as part of @GraphQLApi @Query methods 3428
Build-tools: upgrade to build-tools 2.2.4: fixes issues with jlink, devloop, maven 3.8 and Windows 3465

2.3.3

This is a bug fix release of Helidon. It contains bug and performance fixes. We recommend all Helidon 2.x users upgrade to this release.

Compatibility

2.3.3 is API compatible with 2.3.0.

CHANGES

WebServer and WebClient race conditions fixed 3351
WebServer: Fix missing CORS headers if response has 404 status (#3206) 3280
WebClient: HTTP to HTTPS request hang fix 3351
Tracing: Modified Jaeger logic to not close scopes before switching threads 3274
Security: Fix NPE in outbound of JWT provider. (#3295) 3297
Reactive: 3129 3216 BEP refactor backport 3327
MicroProfile: Use MP config instead of Config.create() in MP components. 3291
Metrics: Performance: Improve some interceptor code paths in metrics (#3251) 3328
Metrics: Metrics and routings fixes (#3260) 3324
Metrics: Add the KPI metrics handler (with no qualifying path) exactly once each routing (#3255) 3282
Metrics: Suppress empty labels in exemplars which result in {}; yield a truly empty string instead 3281
Fault Tolerance: Explicitly destroy bean instance obtained from CDI object 3274
Docs: Helidon config documentation updates (#3187) 3284
Dependencies: Upgrade org.glassfish:jakarta.el to 3.0.4 3331
Dependencies: Upgrade helidon-build-tools to 2.2.3. to fix issues with Maven 3.8 and JDK 11.0.11+ 3362 3370

2.3.2

This is a bug fix release of Helidon. It contains bug fixes and minor enhancements. We recommend all Helidon 2.x users upgrade to this release.

Compatibility

2.3.2 is API compatible with 2.3.0.

CHANGES

Health: Health check for OCI ObjectStorage that works in SE and MP 3157
Logging: Fix Bug #3032 with SLF4J dependancy 3047
Metrics: Correct the reported Prometheus metric type for ConcurrentGauge metrics 3160
Metrics: Fix incorrect handling of omitted display name (and description) revealed by gRPC 3178
Security: Allowed cipher suite can now be specified for WebServer and WebClient 3144
Security: Audit does not format message if not loggable. 3156 3162
Tests: Fixed failing mp-graphql integration test when using JDK17 (#3100) 3176
Tracing: Improved handling of Jaeger spans/scopes across threads 3134
Utils: Loom support moved to ThreadPoolSupplier 3164
Vault: Custom path for Vault auth methods 3161
WebServer: Reactive streams compliant BareResponseImpl 3153
WebServer: Set content-length to 0 if empty response 3135
Docs: Fixed typos in link 3167
Docs: New note about the generation of passphrase protected PKCS#1 keys 3145
Documentation SE : OIDC Postman extension 2740
Examples: Fix for exec:java to exec:exec 3148
Examples: Remove jakarta.activation dependency from examples and archetypes 3155

2.3.1

2.3.1 is a bug fix release of Helidon. It also includes some minor enhancements.

MP Config Updates

Features from MP Config 2.0 that are backward compatible were added in this release:

Configuration profiles were added. You can now define a configuration profile (such as dev) using configuration property mp.config.profile. If such is defined, config will load default properties microprofile-config-${profile}.properties, and it will look for properties prefixed with %${profile}- first.
OptionalInt, OptionalLong, and OptionalDouble were added as supported types

Compatibility

2.3.1 is API compatible with 2.3.0.

There has been one minor package change. Base64Value has been moved from Helidon Integrations Common REST module to the module Helidon Common. Due to that action, import has changed from io.helidon.integrations.common.rest.Base64Value to io.helidon.common.Base64Value, but the class is the same.

CHANGES

WebServer: Introduce backpressure to webserver 3108
WebServer: support colons in passwords 3045
WebServer: Ignore path parameters when matching routes 3097
WebServer: Honor bind address and host in configuration 3105
WebServer: Encode paths returned as part of 404 responses 3048
WebServer: A few more cases of HTML encoding in error messages 3051
WebServer: Adds convenience method to clear/invalidate a cookie 3037
WebServer: 3086: Fix SSE event sending 3087
WebClient: Host IPv6 matching is now cached 3028
Tracing: Publish internal Jaeger tracing metrics via Helidon's metrics system 3000
Test: Add support for YAML configuration in Helidon Junit 5 testing 3025
Security: Helidon crypto module 2989
Security: Add optional support to security providers 3039
Reactive: Fix Intermittent MultiFlatMapPublisherTest#multi 3068
MicroProfile Server: Reactive routing via cdi provider 3050
Metrics: Adjust JSON timer histogram output using the units (if any) that were set on the timer 3132
Metrics: Add extended key performance indicators metrics support 3021
Messaging: Messaging connector type check 3044
JPA: Ensure container-managed EntityManagerFactory contextual references are eagerly inflated 3018
JDBC: Allow underscores in JDBC param names 3023
JAX-RS: Single injection manager in use, we can only shut it down once. 3101
JAX-RS: Allow sharing of same Jersey's injection manager across multiple JAX-RS applications 2988
GraphQL: Upgrade GraphQL to support mp-graphql spec 1.1.0 3065
GraphQL: Minor update to README and add missing @NonNull on TaskApi 3091
Examples: Silence Weld's INFO logging on quickstart examples 3131
Docs: Upgrade javadoc-plugin. Silence error for org.jboss.logging.annotations.Message$Format 3077
Docs: Update Config Guide to describe how to change pom for custom main class 3083
Docs: Fix various formatting and processing errors in doc files 3036
Docs: Add missing javadoc to module-info files 3020
Docs: added attribute for javadoc-base-url-api to fix broken links 3034
Dependencies: Upgrade jgit to 5.11.1.202105131744-r 3040
Dependencies: Upgrade jboss classfilewriter 3074
Dependencies: Upgrade etcd4j to 2.18.0 3043
Dependencies: Update SmallRye OpenAPI to 1.2.3 for Helidon 2.x 3080
Dependencies: Updates Eclipselink to 2.7.8 3042
Dependencies: Suppress jgit false positive 3015
Config: MP Config profiles 3096
Config: Deprecated classes made public on oversight 3038

2.3.0

2.3.0 is a minor release of Helidon that contains bug fixes and enhancements. Notable enhancements:

HashiCorp Vault support (Experimental)
Oracle OCI Vault support (Experimental)
Oracle OCI Object Storage support (Experimental)
Neo4J support (Experimental)
Micrometer metrics support (Experimental)
gRPC native image support
Reloadable WebServer TLS certificates
New metric: Exemplars
Scheduling feature to schedule periodic tasks
Performance improvements for JAX-RS applications with large number of concurrent connections

Experimental features are tested, supported and ready for use. But their APIs are subject to change.

Users of the current OCI Object Storage extension (helidon-integrations-cdi-oci-objectstorage) are encouraged to look at the new OCI Object Storage support (helidon-integrations-oci-objectstorage). The old OCI object storage support will be deprecated in a future release.

Compatibility

2.3.0 is API compatible with 2.2.0.

There is a behavior change related to Java marshalling in gRPC. io.helidon.grpc.core.JavaMarshaller has been deprecated and disabled by default. It's use is not recommended for production and it will be removed in Helidon 3.0. If you need to use the JavaMarshaller you can re-enable it by setting the grpc.marshaller.java.enabled configuration property to true.

CHANGES

Config: Meta-Configuration support for Helidon MP. 2767
Config: Support for custom default config file suffixes 2717
DBClient: Removed query parameter check that is too strict. 2693
DBClient: DB Client unwrap support for JDBC and MongoDB internals 2970
Fault Tolerance: Fix delay computation in Retry policies 2938
GraphQL: Support java.util.Date 2706
JAX-RS: Fix NPE with async Jersey resource 2911
JAX-RS: Handle startups with request scopes available from CDI 2933
Media Support: Improve exception message and javadoc for MediaSupport. 2888
Metrics: Add exemplar support to histogram (and histogram part of timer) Prometheus output 2912
Metrics: Add missing metrics coverage and ensure proper coverage of future metrics in gRPC 2818
Metrics: Allow use of config to set up built-in disk space and heap memory health checks 2934
Metrics: Implement Micrometer integration, with some new abstractions for interceptors and retrofit to MP metrics 2873 2930
Metrics: Redesign of how MP metrics interceptors work; support async JAX-RS endpoints for additional metrics 2868
Messaging: JMS: duable consumer support 3007
Misc: Fixed all service providers to be consistent 2926
Native Image: ClassCastException during Graal native image and ReST Client 2917
Native Image: Fix for Jersey native image. 2811
Native Image: Fix for native image. 2753
Native Image: Fix injection of metrics registry in native image 2916
Native Image: Substitute JAAS Subject context lookup in native image 2782
Native Image: Weld feature disconnected from runtime. 2906
Native Image: gRPC native image support in SE 2733
Neo4j integration 2692
OCI Integration: Common classes for JSON based REST APIs for integration. 2879
OCI Instgance Principal Authentication 3001
OpenAPI: Remove need to instantiate Application classes twice for OpenAPI support 2829
Performance: Implementation of ResponseWriter using pooled Netty buffers 2805
Performance: New implementation of WorkQueue that allows concurrent enqueuing of tasks 2859
Reactive: Multi to ByteChannel 2864
Scheduled tasks 2301
Security: HTTP Signature fix to work according to specification. 2884
Security: HTTP Basic auth Hash equals robustness 2871
Vault/Config: Add encryption, digest and secret 2872
Vault: Hashicorp vault integration 2895
Vault/Object Storage: Oracle OCI integration for Vault and Object Storage 2894 2973
WebClient: Content-length set to 0 for PUT and POST if no entity has been sent 2924
WebClient: Using an interface instead of an enum implementing it. 2875
WebClient: URI handling improved 3004)
WebServer: Correctly handling content type of icons. 2905
WebServer: Ensure that the context is set throughout the request lifecycle 2898
WebServer: Fixes problems with HTTP/2 connections 2920
WebServer: Reloadable WebServer TLS during runtime 2900
WebServer: Static content support module. 2705
gRPC: Add support for gRPC reflection 2822
gRPC: JavaMarshaller deprecation 2975
Build: Add plugin to spotbugs-maven-plugin 2878
Build: Checkstyle now checks class javadocs. 2935
Build: Faster license filtering 2749
Build: Remove the Helidon specific info from application effective pom 2783
Build: New copyright checker, enforcer plugin, service file generator 2993
Dependencies: Graalvm upgrade (Merge do not squash) 2710
Dependencies: Upgrade Hibernate and jaxb-runtime used by maven-jaxb2-plugin. For JD… 2862
Dependencies: Upgrade Jersey and MP Rest client 2971
Dependencies: Upgrade Netty to 4.1.63.Final 2915
Examples: Fixes and cleanup 2891 2768 2931 2858
Examples: More fixes and cleanup 2830 2936 2901 2656
Examples: WebServer Threadpool example 2836
Examples: multiple ports 2834
Docs: Fix #2809: h2 dependency in DB Client doc 2832
Docs: Fixed Javadoc links in document 2819
Docs: New section in docs for bean validation 2792
Docs: OCI and Vault documentation 2979
Docs: consitently document maven coordinates 2921 2974
Docs: various updates 2958 2960 3003
Tests: Fix imports to use Hamcrest and Junit5 instead of Junit4 2902
Tests: Fixed interfering tests in MP config. 2714
Tests: Move Multi reactive streams tck to standalone test project 2762
Tests: MultiByteChannel test RC fix 2843

Thanks!

Thanks to community members dansiviter and martin-sladecek for helping to make this release possible.

2.2.2

2.2.2 is a bugfix release of Helidon. In addition to fixing various bugs it contains a security fix for an issue concerning the use of security annotations (such as @Denyall, @RolesAllowed) on JAX-RS Applications and sub-resource locators that are discovered by CDI. See issue 2903 for more details.

This upgrade is recommended for all users of Helidon 2.

Compatibility

2.2.2 is API compatible with 2.2.0.

CHANGES

WebClient: keep-alive minor improvements 2882
WebClient: Keep alive default value changed to true 2775
Security: Obtain the actual class when instance is injected by the CDI 2897
MicroProfile Server: Remove standard output. 2780
Metrics: Avoid NaN values causing problems in metrics output 2812
Logging: Slf4j MDC context propagation with null MDC map fixed 2861
JAX-RS: Use one of Jersey's implementations of PropertiesDelegate 2756
Fault Tolerance: New RequestScopeHelper class to track request scopes across threads 2856
Dependencies: Upgrade Netty to 4.1.59.Final 2793

2.2.1

2.2.1 is a bugfix release of Helidon. It contains bug fixes, performance fixes and dependency upgrades.

Compatibility

2.2.1 is API compatible with 2.2.0.

CHANGES

Config: Fix issue with null value in JSON. 2723
Config: Fix null array values in HOCON/JSON config parser. 2731
Dependencies: Re-organize dependencyManagement 2646
Dependencies: Update Jackson to 2.12.1 2690
Dependencies: Upgrade Netty to 4.1.58 2678
Dependencies: Upgrade Weld 2668
Dependencies: Upgrade grpc to v1.35.0 2713
Dependencies: Upgrade to Jersey 2.33 and set of client property 2727
Dependencies: Upgrades OCI SDK to version 1.31.0 2699
Examples: Fix TODO application: 2708
Examples: Fix WebServer Basics example 2634
Examples: Fixed different output in DbClient SE archetype 2703
Examples: PokemonService template fixed in SE Database Archetype. 2701
Fault Tolerance: Do not attempt to access the request context in Fallback callback 2748
Jersey: Allow override of Jersey property via config 2737
K8s: Update k8s descriptors to avoid using deprecated APIs 2719
Metrics: Support async invocations using optional synthetic SimplyTimed behavior 2745
Micronaut extensions: micronaut data with ucp 2572
Performance: New implementation of LazyValue 2738
Performance: Properly release underlying buffer before passing it to WebSocket handler 2715
Performance: improvements to queue(s) management in Webserver 2704
Reactive: Concat array enhancement 2508
Rest Client: Rest client async header propagation with usage of Helidon Context 2735
Security: Added overall timeout to evictable cache 2659
Testing: Proves that environment variable overrides work with our MicroProfile Config implementation 2648
Testing: Separate execution of DataChunkReleaseTest in its own VM 2716
WebServer: Lays the groundwork for permitting other Netty transports 2478
Build: Manage versions of version plugin and helidon-maven-plugin 2626

2.2.0

2.2.0 is a minor release of Helidon. It contains bug fixes and enhancements. Notable enhancements:

Experimental: Micronaut extension support 2467
Experimental: Graph QL Support 2504
Experimental: Loom (VirtualThread) support in Helidon MP 2417

Experimental features are ready for use, but their APIs should be considered unstable and subject to change.

Compatibility

2.2.0 is API compatible with 2.1.0.

CHANGES

WebServer: Support for a max payload limit on client requests 2491
WebServer: Add a shutdown hook to executor service in JerseySupport 2505
WebServer: Fix Request chunks emitted after response is completed are not released 2605
WebServer: Support for HTTP pipelining 2591
WebClient: Methods contentLength and transferEncoding added 2490
WebClient: Double query escaping in WebClient fixed 2513
Tracing: add tags before span start in jersey ClientTracingFilter #1942 2512
Tracing: Make sure span.finish() is not called twice 2466
Tests: Fix pom.xml of helidon-microprofile-tests-junit5 2485
Tests: Convert tests to use the new infrastructure 2498
Tests: Adds a unit test proving that multiple persistence units can be injected 2503
Tests: Address intermittent test failures 2517
Security: Using the default keystore type instead of JKS 2536
Security: Support for overriding configuration of security providers 2511
Security: Global context and its use in Security 2549
Security: Fixed docs and impl - outbound security 2538
Security: Honoring disabled security through configuration for OIDC support 2577
Micronaut integration 2467 2602
Metrics: Add vetoed-bean support to metrics CDI extension 2507
Messaging: Messaging discrepancies 2453
Messaging: Make JmsMessage builder methods accessible 2617
Messaging: JMS Reactive Messaging connector 2282
Messaging: AQ acknowledgement propagation fix 2623
Messaging: Native image compatible Kafka connector #2346 2555
Messaging: Jms connector SE api 2543
Media: Json stream writers 2523
Loom: Initial stab at incorporating some Loom features into Helidon in a way that will work under JDK 11 or 16-loom-ea 2417
Logging: MDC logging support 2479
Logging: Examples of logging with Helidon 2533
JPA: PostgreSQL driver support for JPA/Hibernate in native image 2596
JPA: MySQL driver support for JPA/Hibernate in native image 2557
Health: Add messaging health dependency to bom 2556
Fault Tolerance: Revised logic for handling request scopes and contexts in Jersey/HK2 2534
Fault Tolerance: Request scope propagation for non-async calls in FT 2495
Fault Tolerance: Do not create and cache handlers for fallbacks 2546
GraphQL: Experimental Graph QL Support 2504
Examples: Make example Kafka working on MAC 2541
Examples: Fix uses of jlink-image directories to use new "-jri" suffix. 2469
Examples: Using config reference instead of ${ALIAS= 2579
Examples: Logging setup in examples and templates 2583
Docs: Updated path reference to fix the broken link. 2509
Docs: Update jlink guide with .jmod requirement. 2535
Docs: Update doc's microprofile version to 3.3 2488
Docs: Some minor doc improvements 2527
Docs: SE intro: fixed typo 2545
Docs: Increase visibility of Getting started in Overview 2568
Docs: Improve doc for built-in health check thresholds, etc. 2559
Docs: Helidon SE OIDC Security provider guide 2310
Docs: Helidon MP OIDC Security provider guide 2311
Docs: Fix instructions for enabling JSON-P for Health-Checks. 2528
Docs: Updating JTA and JPA guides 2570
Docs: Misc fixes 2616 2615 2573
Dependencies: Exclude jakarta.ejb-api 2595
Dependencies: remove weld-probe-core 2506
Dependencies: Upgrade Hibernate to 5.4.25.Final 2575
Dependencies: Upgrade GraalVM 2510 2514
Dependencies: Upgrade apache-httpclient, google-api-client and snakeyaml 2482
Dependencies: Upgrade Guava version to 30.0-jre 2620
Dependencies: Update ojdbc deps 2530
Dependencies: Move scala dep from bom 2542
Dependencies: Add dependency-check-maven plugin 2472
Dependencies: Import ojdbc deps with bom 2588

2.1.0

2.1.0 is a minor release of Helidon. It contains bug fixes and enhancements. Notable changes:

MicroProfile 3.3 support
New Helidon SE Fault Tolerance implementation. This also replaces Hystrix in the MicroProfile Fault Tolerance implementation.

Compatibility

2.1.0 is API compatible with previous releases of 2.0. There are some minor behavioral changes:

Security: To remove accidental propagation of identity, all security providers that support outbound security were updated to only do outbound security when configured so. All of these providers now have an outbound configuration section that can define outbound targets. Documentation of providers was updated to match this new approach and is available in both MP and SE docs.
Custom jlink images produced by the helidon-mave-plugin now have a -jri suffix. So the path to start your application looks something like: target/helidon-quickstart-se-jri/bin/start

CHANGES

Config: Git config native-image support 2400
Config: Injection of web target with correct endpoint. 2380
Config: Config now supports merging of objects and lists 2448
DBClient: integration tests for MySQL, MadiaDB, PostgreSQL and MS SQL 2383
DBClient: Fix NPE on error in tx 2286
DataSource: Use Config.getPropertyNames() instead of retrieving getPropertyNames() from ConfigSources 2322
Fault Tolerance: Implementation of MP FT 2.1.1 using FT SE 2348
Fault Tolerance: Limit module visibility by making several classes package private 2359
Fault Tolerance: Name support for all those operations that implement FtHandler 2404
Fault Tolerance: Updated test to verify @CircuitBreaker does not interfere with request scope 2387
Fault Tolerance: Updates to FT tests to take advantage of @HelidonTest 2370
JAX-RS: Allow user-provided CDI extensions to veto JAX-RS classes 2429
JAX-RS: Jersey update to version 2.32 2406
Media: DataChunkedInputStream deadlock protection removed 2401
Media: Update MediaType, lazy non known type, read-only parameters map 2308
Media: media-jackson native-image support 2385
Messaging: Messaging health check 2352
Messaging: Log Kafka sending error which caused channel cancel 2447
Metrics: Avoid race condition by using ConcurrentHashMap 2435
Metrics: Update release of Prometheus Java client (in 2.x) 2419
Native Image: When class is annotated with @MappedSuperclass, its private fields can't be accessed from JPA with native image 2127
Native image: Tyrus server support for native-image in SE 2097
Native image: Windows native-image fix 2336
Native image: Use latest version for helidon plugin to include native image fix. 2374
OpenAPI: Use CDI to instantiate Application classes to invoke getClasses 2325
Reactive: Multi discrepancies 2413
Reactive: Single.never not singleton 2349
Security: Added support for remote host and port to jersey and security 2.x 2368
Security: Disable automatic propagation from security providers 2357
Security: OIDC fixes 2378
Security: Support for methods in outbound targets. 2335
Testing: Intermittent test failure fix 2347
Testing: MP Testing 2353
Testing: Update surefire and failsafe to 3.0.0-M5 2307
Testing: Junit4 upgrade 2450
Tracing: Update to later release of MP OpenTracing 2313
WebClient: Changes of the request via WebClientService are now propagated 2321
WebClient: Webclient uses relative uri in request instead of full uri 2309
WebServer: ClassPathContentHandler can survive tmp folder cleanup 2361
WebServer: Enable support for HTTP compression in the webserver 2379
WebServer: Secure static content 2411
WebServer: WebSocket Extensions 1934
WebServer: Public API to get absolute URI of the request 2441
WebServer: Attempt to start a stopped server will fail with IllegalStateException 2439
gRPC: Fix issue with gRPC clients and services where method signatures have types with nested generics 2283
gRPC: Update gRPC Version 2388
CDI: Service class fixed. 2317
CDI: CDI.current().getBeanManager() now available during shutdown 2438
Examples: Fix 2391 Bug in generated Dockerfile.native from quickstart-mp 2393
Examples: Update standalone quickstarts. 2360
Examples: Updated maven surefire plugin to helidon-standalone-quickstart-mp 1849
Documentation improvements: 2428 2399 2410 2390 2329 2397 2367 2363 2351 2328 2457 2443

2.0.2

2.0.2 is a bug fix release to Helidon 2.0. It contains bug fixes and minor enhancements. This release upgrades MicroProfile support to Health 2.2 and Metrics 2.3.2.

This release contains experimental support for fault tolerance APIs in Helidon SE. These APIs are unstable and will likely change in future releases.

Changes

WebServer: Added support for HTTP PATCH on Helidon SE 2284
WebServer: Redundant filter execution fix 2276
WebServer: Use all configured fields. 2192
WebServer: Upgrade to Netty 4.1.51 2204
WebServer: Form params ampersand and no value fix 2227
WebServer: Fix failures caused by memory leak when sending bad requests. 2260
WebServer: Configuration of server socket(s) 2189
WebServer: to enable netty log handler output, please use logger io.helidon.webserver.NettyWebServer$NettyLog and set it to FINEST level
WebClient: Native smoke test for webclient 2112
WebClient: Intermittent test failure with keep-alive enabled fix 2238
WebClient: redirection to path fix 2150
WebClient: request id added and logging messages updated 2257
WebClient: support keep-alive 2139
WebClient: to enable netty log handler output, please use logger io.helidon.webclient.NettyClientInitializer$ClientNettyLog and set it to FINEST level
Security injection in application scope. 2154
Security: Fix for P-521 curve - wrong id 2.x 2281
Security can now be disabled. 2157
Security CDI extension has higher priority 2299
Reactive: Allow cancellation of Future's wrapped in Single's and vice versa 2288
Reactive: Flaky MultiFromNotTrustedInputStreamTckTest fix 2218
Reactive: Debugging log operator 1874
Reactive: Single add forSingle and exceptionallyAccept 2121
Reactive: Kafka connector topic pattern 2242
Reactive: Buffer single-byte writes in MultiFromOutputStream for better performance 2133
Reactive: Backpressure counter race condition fix 2250
Native image update 2078
Native Image: Support for non-String parameters in JAX-RS for native image 2303
Metrics: Remove FinalRegistry and its use for the base registry; part of move to MP metrics 2.3 2188
Metrics: Missing metric 2235
Metrics: Fixes a few problems in metrics 2240
Metrics: Add support for MP Metrics 2.3 2245
Messaging: Kafka message default ack npe fix 2252
Media Support: Upgrade Jackson to 2.11.1 2162
Meida Support: Upgrade Yasson to 1.0.8 2254
Media Support: Multipart postfix fix 2233
Media Support: Multipart decoder rework 2193
Media Support: Media support for forms improved 2144
Media Support: Flush streamed datachunk one by one 2129
JPA: Upgrading to the latest version of the Eclipselink Maven plugin and aligning Eclipselink version to correspond with it. 2138
JPA: Upgrade Hibernate to 5.4.18.Final 2212
JPA: Use Session.getDatasourceLogin() instead of Session.getLogin() in CDISEPlatform.java 2263
Health: Support MP health 2.2 2264
Health: Health check now non-blocking using fault tolerance async and timeout 2237
Fault tolerance for SE (experimental) 2120
Fault Tolerance: Location of the default value for header validation changed 2228
Fault Tolerance: Make sure request scope is propagated to newly created threads in FT 2229
Examples: Add app.yaml to quickstart archetypes. Update k8s support in docs. 2141
Examples: Update microprofile examples to use microprofile-config.properties 2163
Examples: Swapped ports in mutual TLS example 2184
Examples: Quickstart gradle fixes 2214
Examples: Change Dockerfiles to use maven.test.skip (not skipTests) 2135
Examples: Add -Declipselink.weave.skip to quickstart Dockerfiles 2146
Docs: update MP tutorial to be correct for Helidon 2.0 2152
Docs: replaced table with new cards/icons 2185
Docs: fix minor issues #2081 #427 2119
Docs: Move CLI documentation to a single page under About 2148
Docs: Minor doc fixes #2093 #2086 #2085 2118
Docs: Migration Guides: add section for Getters returning Optional. Fix code blocks. 2217
Docs: Corrected dependency information in the JPA guide for MP. 2198
Docs: #2221 Fixes API reference in Metrics docs 2232
Docs: tls updates 2256
CLI: Create cli-data for snapshot builds 2137
CDI: Upgrade Weld to 3.1.4 2177
CDI: Support for bean producers in different package than beans that have … 2241
CDI: Introduces an ExecutorServices implementation to Helidon's repackaged Weld implementation to ensure context classloaders are never null 2269
Archetypes: Properly use path() when creating invocations 2116
Archetypes: Added to avoid warnings 2117
Tests: Weaken test assertion for executions in very slow systems 2287
Tests: Set junit4 version where used. Fixes #2289 2290
Tests: Removed unnecessary plugin versions, now inherited. 2181

2.0.1

2.0.1 is a minor bug fix release to Helidon 2.0.0. This release fixes a key issue in Config as well as some issues in documentation and example archetypes.

Fixes

Config: Support for SE mappers in MP. 2091
Archetype fails on maven version detection on some Linux distributions 2102 2106
Archetypes: Some fixes and improvements to the db archetypes 2100
GraalVM: Update docs, READMEs, Dockerfiles to graalvm 20.1.0 2103
Docs: add basic documentation for CLI 2101 2094

2.0.0

Helidon 2.0.0 is a major release that includes significant new features and fixes. As a major release it also includes some backward incompatible API changes. See section below.

Notable New Features

Helidon MP GraalVM Native Image support (in addition to existing Helidon SE GraalVM Native Image support)
Jakarta WebSocket support
CORS support
Easy generation of jlink custom runtime images including support for CDS archives for improved startup performance
Move to Java 11 APIs
Move to Jakarta EE APIs
Improved discovery and handling of JAX-RS applications
New MediaSupport API
Plus many other minor features and fixes

The following are early access features that are ready for developer use:

Helidon SE reactive Web Client
Helidon SE reactive DB Client
MicroProfile Reactive Streams Operators
MicroProfile Reactive Streams Messaging
The Helidon CLI for creating new projects and fast iterative development

For more information see our documentation at Helidon 2.0.0 Documentation

Changes

Changes between 2.0.0-RC2 and 2.0.0:

Config: SE Config can be created from MP Config 2060
Native image: Upgrade svm, annotation for reflection 2070
Native image: JPA tests and native-image build changes 2014
Native image updates 2050
Native Image: Oracle DB with JPA 2044
WebServer: Content now extends Multi 2043
MediaSupport: media support deprecations cleanup 2068
Reactive: Cancelling race condition fix 2027
Security: Secure and httpOnly used correctly in SetCookie 2056
Archetypes: Update MP db archetype to compile with native image. 2073
Archetypes: DB Archetypes: README updates for native support 2065
Archetypes: Remove unused import from template 2048
Documentation: update for AOT. 2045
Documentation: Collapsible docs menus / integrate build-tools 2.0.0 2067
Documentation: Docs cleanup 2074
Documentation: Various AsciiDoctor warning fixes 2072
Documentation: intro for JWT auth - link to mp spec 2069
Documentation: Fixed broken links; added new 2071
Documentatino: SE Messaging doc 2029
Documentation: WebClient doc update 2064
Documentation: fixed broken links in the intro 2022

Backward incompatible changes

In order to stay current with dependencies and also refine our APIs we have introduced some backward incompatible changes in this release. For details see the Helidon 2.0 MP Migration Guide and the Helidon 2.0 SE Migration Guide

Thank You!

Thanks to community members dansiviter, graemerocher , and akarnokd for their contributions to this release.

2.0.0-RC2

Notes

This is the second release candidate of Helidon 2.0.

Notable New Features

This release focuses on documentation, bug fixes, performance fixes and cleanup.

Also, a number of deprecated methods have been removed from this release. See "Remove deprecations" in the list below.

Changes

CORS: Change CORS config key from path-prefix to path-expr; method names also 1807
Config: Decrypt AES method made visible 2003
Config: Fix #1802 - Allow use of filters and mappers when converting MP to He… 1803
Config: Log warning if a known configuration file exists and we have no parser 1853
Config: Using SafeConstructor with YAML parsing. 2019
Config: Fixes StackOverflowError unearthed by new MicroProfile Config implementation 1760
DBClient: doc for issue 1629 1652
DBClient: api update to reactive 1828
DBClient: JSON-P Streaming support 1796
FaultTolerance: Wait for thread completion only if interrupted flag set 1843
Features: Experimental feature support. 2018
Features: Feature refactoring 1944
Health check fixed 1809
JAX-RS @Provider autodiscovery 1880
JDBC: Updated UCP version to always be in sync with Oracle's OJDBC8 version since the two artifacts are mutually dependent 1831
Jersey: connector to Helidon WebClient 1932
Jersey: Correctly disable Jersey WADL support and built-in providers. 1971
Jersey: Make the helidon-jersey-connector module discoverable by Jersey if available 2008
Jersey: Upgrading Jersey to version 2.31 1887
Kafka specific message 1890
Media Support: DataChunkInputStream more then one close does not throw exception 1904
Media Support: lazy accepted types parsing 1921
Media Support: flattening 1899
Media Support: methods 1905
Media Support: DataChunk ByteBuffer array 1877
Media Support: DataChunkInputStream can cause deadlock if handled by the same thread… 1825
Media Support: DataChunkInputStream char duplication fix 1824
Media Support: Fix handling of generics when reading objects 1769
Media Support: Service loader added to MediaContext 1861
Messaging: Messaging with Kafka examples 2016
Metrics: Fail deployment for Gauges in RequestScoped beans 1978
Metrics: Remove MP Metrics 1.0-to-2.0 bridge component and related classes 1879
MicroProfile: Changed name of SyntheticApplication to HelidonMP 1812
MicroProfile: Container startup issue fixed. 1912
Modules: Module and Java 12+ friendly way of defining classes for Weld Proxies. 1967
Native Image: Database native support update 2028
Native Image: MP native image no longer misses bean types for proxies. 1988
Native image fixes for new Jersey version. 1910
Native image: AOT (native image) documentation for Helidon. 1989
Native image: Remove obsolete configuration file. 1927
Native image: Welcome file for classpath static content in native image 1980
Reactive: Use EmittingPublisher in OutputStreamPublisher to remove busy waiting 1900
Reactive: Alias for concatArray 1826
Reactive: BufferedEmittingPublisher as replacement for OriginThreadPublisher 1830
Reactive: BufferedEmittingPublisher draining race condition fix 1928
Reactive: Deprecated Multi#from 1888
Reactive: Emit after close fix 1856
Reactive: EmittingPublisher cleanup 1923
Reactive: Multi await feature for intentional blocking 1664
Reactive: Multi from InputStream 1770
Reactive: Multi onComplete operators 1806
Reactive: MultiFromOutputStream blocking close refactor 1943
Reactive: ReadableByteChannelPublisher executor leak 1924
Reactive: Reimplement Concat with varargs 1815
Reactive: Remove OriginThreadPublisher 1859
Reactive: ResponseCloser now supports Single 1883
Reactive: Revert filters as function instead of reactive processors. 1917
Reactive: SE Reactive Messaging 1636
Reactive: Single onCancel and OnComplete fixes 1814
Reactive: Trigger Single stream only in terminal ops 1864
Reactive: Trigger Single to CS conversion on first CS method call 1886
Security: Rearrange the messages which report missing config 1810
Security: Security level memory leak 2013
Security: master: correctly validate mandatory JWT claims. 2011
Tracing performance optimization. 1916
WebClient: API changed from CompletionStage to Single 1832
WebClient: API update 1870
WebClient: automatic system loader 1903
WebClientL minor proxy fixes 1792
WebClient: SSL in WebClient and WebServer changed to TLS 2006
WebClient: TemporalUnit methods removed 2004
WebClient/DBClient: Alignment of client service APIs between Db and Web Clients. 1863
WebServer API to use Single and Multi 1882
WebServer configuration changes 1766
WebServer: Allows proxying of ServerRequest v2.x/master 1878
WebServer: Check Netty validation of headers before processing request 1827
WebServer: Fix #1711 StaticContentHandler fails with encoded URLs 1811
WebServer: Lazy list for even lazier acceptedTypes parsing 1940
WebServer: Multipart 1787
WebServer: Mutual TLS implementation, example and tests 1992
WebServer: Socket configuration changes. 1844
WebServer: Static content handlers now use explicit writers. 1922
WebServer: Updated SSL Configuration for WebServer 1852
WebSockets example: HTML page for user experience 1946
gRPC: client API improvements (2.0) 1851
gRPC: Add JSONB support to gRPC 1836
gRPC: Minor gRPC 2.0 fixes and improvements 1959
gRPC: Minor gRPC fixes (2.0) 1951
gRPC: Revert "Minor gRPC fixes (2.0)" 1956
Archetypes: (and other examples) typo 1981
Archetypes: catalog 1898
Archetypes: Fixed tag in catalog 2036
Archetypes: New DB archetype for SE 1982
Archetypes: New application types (templates) for the CLI 1797
Archetypes: Quickstart archetypes for SE and MP 2035
Archetypes: Renamed archetype to helidon-bare-mp 2021
Archetypes: Renamed basic archetype to bare 1839
Archetypes: Use helidon-archetype packaging 1889
Archetypes: isolate the helidon-maven-plugin extension 2023
Deprecations: Remove deprecations 1884 1885 1892
Docs: helidon intro 1625 1701
Docs: helidon se intro 1626 1729
Docs: Add CORS MP and SE doc 1895
Docs: Fix broken link in prerequisite page to quickstart example 1996
Docs: Fix formatting issues with included guides 1771
Docs: Fixed SE Config Guide typos from issue 1649 1993
Docs: Fixed tables in Security Providers - issue 1599 1848
Docs: Helidon MP 2.0 Intro 1653
Docs: Mp config docs 1935
Docs: New doc section for FT documenting internal config properties 2020
Docs: Update 3rd party attributions. Renamed 3RD-PARTY to THIRD_PARTY_LICEN… 2024
Docs: Update NOTICE.txt and include in artifacts 1945
Docs: Update SE docs for changed APIs 1970
Docs: Updated migration guides. 1920
Docs: WebClient Intro doc updated with changes 1659
Docs: migration guides 1829
Docs: updated mp jpa intro - added link to mp jpa guide and API 1953
Tests: Add tolerance to metrics tests; widen tolerance used during pipeline runs (2.x) 1999
Tests: Decrease the number of events of KafkaCdiExtensionTest 1763
Tests: Fix intermittent test failure in GrpcServiceTest. 1947
Tests: Fix test failing on windows 1919
Tests: Fixed archetype test based on API changes 1818
Tests: MP Messaging hamcrestination 1765
Tests: Move test dependencies into main pom 1938
Tests: Moving 2 tests from KafkaMP to KafkaSE 1918
Tests: Properly stop wiremock after rest-client tcks 1939
Tests: Redesign in Kafka tests 1847
Tests: Removes mp-test-libs bundle 1813
Tests: Sometimes KafkaCdiExtensionTest fails 1816
Examples: Add trademark notices for Pokemon 2034
Examples: WIP: New JPA example and archetype using Pokemons 1933

Backward incompatible changes

WebClient and WebServer TLS class names aligned

Class configuration names for TLS are now aligned between WebClient and WebServer

Old Name	New Name
`Ssl`	`WebClientTls`
`TlsConfig`	`WebServerTls`

Thank You!

Thanks to community members dansiviter and graemerocher for their contributions to this release.

2.0.0-RC1

Notes

This is the first release candidate of Helidon 2.0.

Notable New Features

This release primarily focuses on finalizing APIs for 2.0. It also includes a number of performance and bug fixes. We expect APIs to be pretty stable between this release and the final 2.0.0 release.

Changes

CORS: Change CORS config key from path-prefix to path-expr; method names also 1807
Config: Fix #1802 - Allow use of filters and mappers when converting MP to He… 1803
Config: Log warning if a known configuration file exists and we have no parser 1853
Config: Rearrange the messages which report missing config 1810
DBClient: DB client api update to reactive 1828
DBClient: JSON-P Streaming support 1796
FaultTolerance: Wait for thread completion only if interrupted flag set 1843
Health: Health check fixed 1809
JAX-RS: JAX-RS @Provider autodiscovery 1880
JDBC: Updated UCP version to always be in sync with Oracle's OJDBC8 version since the two artifacts are mutually dependent 1831
MediaSupport: DataChunkInputStream char duplication fix 1824
MediaSupport: Fix handling of generics when reading objects 1769
MediaSupport: Media support flattening 1899
MediaSupport: Media support methods 1905
MediaSupport: Revert context to original read only parameters. 1819
MediaSupport: Service loader added to MediaContext 1861
Metrics: Remove MP Metrics 1.0-to-2.0 bridge component and related classes 1879
MicroProfile: Changed name of SyntheticApplication to HelidonMP 1812
MicroProfile: Container startup issue fixed. 1912
NativeImage:Native image fixes for new Jersey version. 1910
OCI ObjectStore: Fixes StackOverflowError unearthed by new MicroProfile Config implementation 1760
Performance: DataChunk ByteBuffer array 1877
Performance: Media lazy accepted types parsing 1921
Performance: Tracing performance optimization. 1916
Reactive: Alias for concatArray 1826
Reactive: BufferedEmittingPublisher as replacement for OriginThreadPublisher 1830
Reactive: Decrease the number of events of KafkaCdiExtensionTest 1763
Reactive: Deprecated Multi#from 1888
Reactive: Emit after close fix 1856
Reactive: Kafka specific message 1890
Reactive: Multi await feature for intentional blocking 1664
Reactive: Multi from InputStream 1770
Reactive: Multi onComplete operators 1806
Reactive: Redesign in Kafka tests 1847
Reactive: Reimplement Concat with varargs 1815
Reactive: Remove OriginThreadPublisher 1859
Reactive: ResponseCloser now supports Single 1883
Reactive: Revert filters as function instead of reactive processors. 1917
Reactive: SE Reactive Messaging 1636
Reactive: Single onCancel and OnComplete fixes 1814
Reactive: Sometimes KafkaCdiExtensionTest fails 1816
Reactive: Trigger Single stream only in terminal ops 1864
Reactive: Trigger Single to CS conversion on first CS method call 1886
Reactive: Use EmittingPublisher in OutputStreamPublisher to remove busy waiting 1900
Security: Fixed tables in Security Providers - issue 1599 1848
WebClient DBClient: Alignment of client service APIs between Db and Web Clients. 1863
WebClient: API changed from CompletionStage to Single 1832
WebClient: WebClient API update 1870
WebClient: automatic system loader 1903
WebClient: minor proxy fixes 1792
WebServer: Check Netty validation of headers before processing request 1827
WebServer: DataChunkInputStream can cause deadlock if handled by the same thread… 1825
WebServer: DataChunkInputStream more then one close does not throw exception 1904
WebServer: Fix #1711 StaticContentHandler fails with encoded URLs 1811
WebServer: Multipart 1787
WebServer: Socket configuration changes. 1844
WebServer: Updated SSL Configuration for WebServer 1852
WebServer: WebServer API to use Single and Multi 1882
WebServer: configuration changes 1766
gRPC: Add JSONB support to gRPC 1836
gRPC: gRPC client API improvements (2.0) 1851
Build: enable unstable pipeline status 1768
CLI: Archetype catalog 1898
CLI: Configure helidon-maven-plugin extension for all apps 1896
CLI: New application types (templates) for the CLI 1797
CLI: Renamed basic archetype to bare 1839
CLI: Use helidon-archetype packaging 1889
Dependencies: Upgrading Jersey to version 2.31 1887
Deprecations: Remove deprecations 1884 1885 1892
Documentatino: Fix formatting issues with included guides 1771
Documentation: Add CORS MP and SE doc 1895
Documentation: Docs helidon intro 1625 1701
Documentation: Docs helidon se intro 1626 1729
Documentation: Updated migration guides. 1920
Documentation: migration guides 1829
Tests: Fix test failing on windows 1919

Backward incompatible changes

gRPC: Renamed several annotations and classes

As part of gRPC API cleanup, we have renamed the following annotations and classes:

Old Name	New Name
`@RpcService`	`@Grpc`
`@RpcMethod`	`@GrpcMethod`
`@GrpcServiceProxy`	`@GrpcProxy`
`GrpcClientProxyBuilder`	`GrpcProxyBuilder`

While in general we prefer not to break backwards compatibility by renaming public API classes, we felt that in this case the change was warranted and acceptable, for several reasons:

gRPC API was marked experimental in Helidon 1.x
While using gRPC in our own applications, we have realized that the code in some cases does not read as well as it should, and that some class and annotation names should be changed to improve both internal API consistency and readability

We apologize for the inconvenience, but we do feel that the impact of the changes is minimal and that the changes will be beneficial in the long run.

Internal `helidon-common-metrics` and Related Classes Removed

Later releases of Helidon 1.x included the helidon-common-metrics component and related classes which provided a common interface to ease the transition from MicroProfile Metrics 1.x to 2.x. Although intended for use only by Helidon subsystems rather than by developers and users, the component and its contents had to be public so multiple Helidon subsystems could use them. Therefore, user code might have used these elements.

This release removes this common interface and associated classes. Any user code that used these internal classes can use the corresponding supported classes in io.helidon.metrics:helidon-metrics and MicroProfile Metrics 2.0 instead.

Helidon Artifact	Interfaces/Classes
`io.helidon.common:helidon-common-metrics`	Entire artifact, including all `io.helidon.common.metrics...` classes
`io.helidon.metrics:helidon-metrics`	`HelidonMetadata`
	`InternalBridgeImpl`
	`InternalMetadataBuilderImpl`
	`InternalMetadataImpl`
	`InternalMetricIDImpl`

2.0.0-M3

Notes

This is the third milestone release of Helidon 2.0. It contains significant new features, enhancements and fixes. It also contains backward incompatible changes (see section below). This milestone release is provided for customers that want early access to Helidon 2.0. It should be considered unstable and is not intended for production use. APIs and features might not be fully tested and are subject to change. Documentation is incomplete. Those looking for a stable release should use a 1.4 release.

Notable New Features

Messaging API for SE
Kafka connector
CORS support
Move to Jakarta EE dependencies
New MediaSupport API

Changes

Build: New build infra 1605
CORS: Add CORS support for SE and MP applications to 2.x 1633
CORS: Add CORS support to built-in Helidon services 1670
CORS: Examples 1727 1747
CORS: processing should only be enabled on successful responses 1683
CORS: Avoid setting response headers twice 1679
CORS: Fix CorsSupport default behavior 1714
CORS: Fix incorrect matching of resource methods annotated with @OPTIONS 1744
CORS: Fix isActive computation 1682
CORS: Improve handling of missing config nodes used to init CORS objects 1709
CORS: Make clear which methods expect mapped vs. lower-level CORS config nodes 1700
CORS: Unbundle MP CORS from MP bundle; bolster utility method 1672
Dependencies: Bump version.plugin.helidon to 2.0.0-M2 1535
Dependencies: Dependency convergence + jakarta libraries. 1600
Dependencies: Update to jakarta GAV for CORS MP 1660
Dependencies: Upgrade grpc to follow Netty version used by Helidon. 1614
Docker: Don't remove lib/liblcms.so on graalvm docker image minimization 1577
Docker: Upgrade docker image to graalvm-ce-java11-linux-amd64-20.0.0 1569
Docs: Add custom runtime image guide, maven guide, gradle guide, refactored native image guide. 1639
Docs: Helidon Reactive documentation 1483
Docs: Under Construction pages, icons 1586
Docs: Update javadoc links in documentation to work with new javadoc layout 1754
Docs: Updated Config SPI documentation. 1691
Docs: [WIP] Documentation refactoring 1514
Docs: update slack link to use slack.helidon.io 1665
Examples: 2.0 update example Dockerfiles 1706
Examples: DB Example now correctly non-blocking 1584
Examples: Fixes for MP quickstart in native image. 1564
Examples: Mp messaging example 1479
Examples: Update examples 1715
Examples: Update quickstarts (including MP) to use new GraalVM 20 docker image. 1576
Examples: use application pom, clean up READMEs 1680
GRPC: Move gRPC integration tests to correct location 1621
GRPC: Port change for #1618 to 2.0 1686
JDBC: Updated Oracle JDBC driver Maven coordinates. 1723
JPA: Fixed JPA example 1746
JPA: Removes assertions that do not hold when alternatives and specialization are in play 1556
MP Config: MP Config fixes 1721
MP Config: Support for mutable config sources to remove regression (even though … 1667
MediaSupport: MediaSupport usage redesigned 1720
Messaging: Channel properties must override connector config 1616
Messaging: Kafka support 1510
Metrics: Improve metrics interceptor performance; avoid MetricID creations - 2.x 1602
Metrics: Removed unnecessary synchronization in metrics registry 1575
MicroProfile: Fix ordering of static content and Jersey on server startup 1675
MicroProfile: Restart support for CDI regardless of mode used. 1613
Native Image: Enable reflection init of NioSocketChannel with native image 1722
Native Image: MP native image updates 1694
Native Image: OpenAPI support for native-image 1553
OpenAPI: Do not use cached URLs for locating the Jandex indexes 1590
OpenAPI: Include dynamically-registered apps in just-in-time jandex index 2.x 1555
OpenAPI: Order the apps to run by class name to provide more predictable ordering 1593
Reactive: Function compatible mapper 1637
Reactive: New implementation of PublisherInputStream that improves performance and fixes race conditions 1690
Reactive: OutputStreamPublisher now handles close on its own. 1732
Reactive: Reactive cleanup 1572
Reactive: Route cancellation to a background thread for the TCK's sake 1608
Reactive: Try a different TestNG annotation for the TCK test 1571
Reactive: Add more time to MultiTimeoutFallbackTckTest 1717
Reactive: Apply bugfixes from #1511 1543
Reactive: FIXMEs and signature corrections 1579
Reactive: Fix Multi.flatMap losing items on the fastpath when conditions are not met 1669
Reactive: Fix Multi.timeout onSubscribe/schedule race violating the spec 1674
Reactive: Fluent conversion via compose() & to() 1592
Reactive: Implement observeOn + TCK tests 1546
Reactive: Implement retry() + TCK tests 1541
Reactive: Implement timeout() + TCK tests 1532
Reactive: Reduce the overhead of flatMapIterable + minor fixes 1563
Reactive: Reimplement Microprofile-RS, fix operators, add from(CS) 1511
Reactive: Reorganize methods, remove Single.mapMany 1603
Reactive: Verify flatMap doesn't reorder items from the same source 1687
Reactive: Workaround for an RS 1.0.3 TCK bug 1568
Security: Scope audience and scopes now correctly appended. 1728
Security: Support for IDCS specific feature in OIDC config. 1688
Test: Add support for native-image tests to smoketest script 1622
Test: Fix keys and certs used in gRPC TLS/SSL tests 1597
Test: Tweak smoketest.sh script and fix typos in MP quickstart readme 1550
Test: Unit test fix to work with daylight savings. 1598
Test: Update bookstore test to work with modulepath 1617
Tests: Improved testing for DataChunkInputStream 1692
Tracing: Support for TracerResolver. 1574
WebClient: Proxy changed from interface to class 1537
WebClient: Several minor fixes and improvements to WebClient 1751
WebClient: WebClient example added 1539
WebClient: WebClient used in SE examples and tests 1646
WebServer: Changed the default context root for Websocket endpoints 1624
WebServer: Fixed static content handling bug. 1642
WebServer: Updated WebSocket docs based on latest changes 1631
WebServer: Using wrapped executor for Jersey async. 1647

Thank You!

Thanks to community member David Karnok akarnokd for his significant contributions to our reactive support.

Backward incompatible changes

Removal of processor-like operators

The formerly public Flow.Processor implementations performing common operations have been removed. Users should use the respective operators from Single and Multi instead:

// before
Flow.Publisher<Integer> source = ...
MappingProcessor<Integer, String> mapper = new MappingProcessor<>(Integer::toString);
source.subscribe(mapper);
mapper.subscribe(subscriber);

// after
Flow.Publisher<Integer> source = ...
Multi.from(source)
     .map(Integer::toString)
     .subscribe(subscriber)

Removal of Flows

The class was providing basic Flow.Publisher implementations. Users should pick one of the static methods of Single or Multi instead, which provide the additional benefits of having fluent operators available to them for assembling reactive flows conveniently:

// before
Flow.Publisher<Integer> just = Flows.singletonPublisher(1);
Flow.Publisher<Object> empty = Flows.emptyPublisher();

// after
Multi<Integer> just1 = Multi.singleton(1);
Single<Integer> just2 = Single.just(1);

Multi<Object> empty1 = Multi.empty();
Single<Object> empty2 = Single.empty();

MediaSupport refactored

The MediaSupport class has been used as holder object of media operator contexts. Now, the name has changed to MediaContext, andMediaSupport will be the name given to the interface which defines media support for given type (readers, writers etc.)
The Classes JsonProcessing, JsonBinding and Jackson are now renamed to JsonpSupport, JsonbSupport and JacksonSupport and are implementing the MediaSupport interface.

//before
JsonProcessing jsonProcessing = new JsonProcessing();
MediaSupport mediaSupport = MediaSupport.builder()
    .registerReader(jsonProcessing.newReader())
    .registerWriter(jsonProcessing.newWriter())
    .build();

WebServer.builder()
    .mediaSupport(mediaSupport)
    .build();

//after
WebServer.builder()
    .addMediaSupport(JsonpSupport.create()) //registers reader and writer for Json-P
    .build()

Also See M1 and M2 Notes

2.0.0-M2

Notes

This is the second milestone release of Helidon 2.0. It contains significant new features, enhancements and fixes. It also contains backward incompatible changes (see section below). This milestone release is provided for customers that want early access to Helidon 2.0. It should be considered unstable and is not intended for production use. APIs and features might not be fully tested and are subject to change. Documentation is incomplete. Those looking for a stable release should use a 1.4 release.

Notable New Features

Helidon Web Client
MicroProfile Reactive Streams Operators
MicroProfile Reactive Messaging
Multi and Single extended with the set of new reactive operators
Preliminary WebSocket support
Preliminary jlink image support

Changes

Config: Configuration changes 1357
Config: Default config now loads without duplicates for MP 1369
Config: Fix merging of value nodes in config 2.0 1488
Config: Removed null params and return types from Config API. 1345
Config: Resource from config refactoring. 1530
Config: Stopped executor service will not cause an error in polling strategy. 1484
Config: cache is not using SoftReference anymore. 1494
Config: change support refactoring 1417
DB Client: Mappers for database date/time/timestamps. 1485
Docker Image: Added libstdc++-6-dev to the image 1414
Examples: Remove MP quickstart GreetApplication#getClasses method for auto-discovery 1395
Examples: Gradle file cleanup. Fix deprecations. 1354
Examples: Add OpenAPI annotations to MP quickstart for input and responses on updateGreeting 1394
JAX-RS: Safeguard against JAX-RS app modifications after start. 1486
JAX-RS: Upgrade Jersey 1438
JPA: Resolves JTA/JPA transaction synchronization issues 1473
JPA: Ensures that JtaDataSource instances that are acquired when a transaction is already active have their Synchronizations registered appropriately 1497
JPA: Added further tests in TestJpaTransactionScopedSynchronizedEntityManager.java 1453
JPA: Added more JPA tests 1355
JPA: Added small test to verify database changes in existing JPA test 1471
Javadoc: Java 11 javadoc fixes. Turn on failOnError 1386
Media Support: New media support API. 1356
Media Support: Adds Config into MediaSupport#builder() method 1403
Messaging: MP Reactive Messaging impl 1287
Messaging: Fix completable queue and clean-up of messaging tests 1499
Metrics: Prometheus format problems (master) 1440
MicroProfile Server now properly fails when CDI is started externally. 1371
Native Image: JPA and JTA for native image 1478
OpenAPI: Openapi custom context root 2.x 1521
OpenAPI: Remove dependency on Jackson via SmallRye -2.x 1458
OpenAPI: Support multiple apps in OpenAPI document 1493
OpenAPI: Use CONFIG rather than FINE logging for jandex indexes used - 2.x 1405
OpenAPI: Use smallrye openapi 1.2.0 (in 2.x) 1422
Reactive: Add Helidon-Reactive Scrabble benchmark 1482
Reactive: Add JMH Benchmark baseline to reactive 1462
Reactive: Add Multi.range and Multi.rangeLong + TCK tests 1475
Reactive: Expand TestSubscriber's API, fix a bug in MultiFirstProcessor 1463
Reactive: Fix expected exception 1472
Reactive: Fix reactive mapper publisher tck test 1447
Reactive: Implement Multi.interval() + TCK tests 1526
Reactive: Implement Single.flatMapIterable + TCK tests 1517
Reactive: Implement defaultIfEmpty() + TCK tests 1520
Reactive: Implement defer() + TCK tests 1503
Reactive: Implement from(Stream) + TCK tests 1525
Reactive: Implement reduce() + TCK tests 1504
Reactive: Implement switchIfEmpty + TCK tests 1527
Reactive: Implement takeUntil + TCK tests 1502
Reactive: Implement timer() + TCK tests 1516
Reactive: Improve SingleJust + TCK 1410
Reactive: Move onXXX from Subscribable to Single + TCK 1477
Reactive: Reactive Streams impl 1282
Reactive: Reimplement ConcatPublisher + TCK tests 1452
Reactive: Reimplement Multi.dropWhile + TCK test 1464
Reactive: Reimplement Multi.first + TCK test 1466
Reactive: Reimplement Multi.flatMapIterable + TCK test 1467
Reactive: Reimplement Multi.just(T[]), add Multi.singleton(T) + TCK 1461
Reactive: Reimplement Single.flatMap(->Publisher) + TCK test 1465
Reactive: Reimplement Single.from + TCK tests 1481
Reactive: Reimplement Single.map + TCK test 1456
Reactive: Reimplement many operators + TCK tests 1442
Reactive: Reimplement onErrorResume[With] + TCK tests 1489
Reactive: Reimplement the Multi.map() operator + TCK test 1411
Reactive: Rewrite collect, add juc.Collector overload + TCK tests 1459
Security: public fields for IdcsMtRoleMapperProvider.MtCacheKey 1409
Security: Fail fast when policy validation fails because of setup/syntax. 1491
Security: PermitAll overridden by JWT 1359
WebClient: Webclient implementation (#1205) 1431
WebServer: Adds a default send(Throwable) method to ServerResponse.java as the first step in providing an easy facility for reporting exceptions during HTTP processing 1378
WebServer: SetCookie test for parse method 1529
WebSocket: Integration of WebSockets POC into Helidon 2.0 1280
jlink: jlink-image support. 1398
jlink: Update standalone quickstarts to support jlink-image. 1424

Thank You!

Thanks to community member David Karnok akarnokd for his significant contributions to our reactive support.

Backward incompatible changes

Resource class when loaded from Config

The configuration approach to Resource class was using prefixes which was not aligned with our approach to configuration. All usages were refactored as follows:

The Resource class expects a config node resource that will be used to read it
The feature set remains unchanged - we support path, classpath, url, content as plain text, and content as base64
Classes using resources are changed as well, such as KeyConfig - see details below

OidcConfig

Configuration has been updated to use the new Resource approach:

oidc-metadata.resource is the new key for loading oidc-metadata from local resource
sign-jwk.resource is the new key for loading signing JWK resource

JwtProvider and JwtAuthProvider

Configuration has been updated to use the new Resource approach:

jwk.resource is the new key for loading JWK for verifying signatures
jwt.resource is also used for outbound as key for loading JWK for signing tokens

GrpcTlsDescriptor

Configuration has been updated to use the new Resource approach:

tls-cert.resource is the new key for certificate
tls-key.resource is the new key for private key
tl-ca-cert is the the new key for certificate

KeyConfig

The configuration has been updated to have a nicer tree structure:

Example of a public key from keystore:

ssl:
  keystore:
    cert.alias: "service_cert"
    resource.path: "src/test/resources/keystore/keystore.p12"
    type: "PKCS12"
    passphrase: "password"

Example of a private key from keystore:

ssl:
  keystore:
    key:
      alias: "myPrivateKey"
      passphrase: "password"
    resource.path: "src/test/resources/keystore/keystore.p12"
    type: "PKCS12"
    passphrase: "password"

Example of a pem resource with private key and certificate chain:

ssl:
  pem:
    key:
      passphrase: "password"
      resource.resource-path: "keystore/id_rsa.p8"
    cert-chain:
      resource.resource-path: "keystore/public_key_cert.pem"

2.0.0-M1

Notes

This is the first milestone release of Helidon 2.0. It contains significant new features, enhancements and fixes. It also contains backward incompatible changes (see section below ). This milestone release is provided for customers that want early access to Helidon 2.0. It should be considered unstable and is not intended for production use. APIs and features might not be fully tested and are subject to change. Documentation is incomplete. Those looking for a stable release should use a 1.4 release.

Notable changes:

New Helidon DB Client
Preliminary GraalVM native-image support for Helidon MP (in addition to existing support for Helidon SE)
Improved discovery and handling of JAX-RS applications
Dropped Java 8 support and moved to Java 11 APIs

Improvements

Helidon DB Client 657 1329
Native image: Helidon MP support 1328 1295 1259
Config: Helidon Config now implements MicroProfile config, so you can cast between these two types
Security: Basic auth and OIDC in MP native image 1330
Security: JWT and OIDC security providers now support groups claim. 1324
Support for Helidon Features 1240
Java 11: 1232 1187 1222

Fixes

JAX-RS: Better recovery for invalid URLs and content types 1246
JAX-RS: Fix synthetic app creation + functional test. 1323
Config: replace reflection with service loader 1102
Config: now uses common media type module instead of FileTypeDetector. 1332
JPA: Permit non-XA DataSources to take part in JTA transactions 1316
JPA: Fixes an issue with multiple persistence units 1342
JPA: Address several rollback-related issues 1146
JPA: Relax requirements on container-managed persistence units which can now be resource-local 1243
OpenAPI: Support multiple jandex files on the classpath 1320
Security: Fixed issues with IDCS and OIDC provider. 1313
Security: Removed support for entity modification from security. 1263
Security: Allow usage of exceptions for security in Jersey. 1227
Security: Outbound with OIDC provider no longer causes an UnsupportedOperationE… 1226
gRPC: Minor changes 1299
Quickstart: Fix application jar class-path for SNAPSHOT versioned dependencies 1297
Use Helidon service loader. 1334
Fix optional files in bare archetypes. (#1250) 1321
Make Multi streams compatible with Reactive Streams 1260
Remove Valve 1279
IDE support: Missing requires of JAX-RS API 1271
Metrics: fix unable to find reusable metric with tags 1244
Support for lazy values and changed common modules to use it. 1228
Upgrade jacoco to version 0.8.5 to avoid jdk11 issue 1281
Upgrade tracing libraries 1230
Upgrade config libraries 1159
Upgrade Netty to 4.1.45 1309
Upgrade Google libraries for Google login provider. 1229
Upgrade H2, HikariCP, Jedis, OCI SDK versions 1198
Upgrade to FT 2.0.2 and Failsafe 2.2.3 1204

Backward incompatible changes

In order to stay current with dependencies, and also refine our APIs we have introduced some backward incompatible changes in this release. Most of the changes are mechanical in nature: changing package names, changing GAV coordinates, etc. Here are the details:

Java Runtime

Java 8 support has been dropped. Java 11 or newer is now required.

Common

Removed io.helidon.reactive.Flow, please use java.util.concurrent.Flow
Removed io.helidon.common.CollectionsHelper, please use factory methods of Set, Map and List
Removed io.helidon.common.OptionalHelper, please use methods of java.util.Optional
Removed io.helidon.common.StackWalker, please use java.lang.StackWalker
Removed io.helidon.common.InputStreamHelper, please use java.io.InputStream methods
Removed dependency on Project Reactor

Tracing

We have upgraded to OpenTracing version 0.33.0 that is not backward compatible, the following breaking changes exist (these are OpenTracing changes, not Helidon changes):
1. TextMapExtractAdapter and TextMapInjectAdapter are now TextMapAdapter
2. module name changed from opentracing.api to io.opentracing.api (same for noop and util)
3. SpanBuilder no longer has startActive method, you need to use Tracer.activateSpan(Span)
4. ScopeManager.activate(Span, boolean) is replaced by ScopeManager.activate(Span) - second parameter is now always false
5. Scope ScopeManager.active() is removed - replaced by Span Tracer.activeSpan()
If you use the TracerBuilder abstraction in Helidon and have no custom Spans, there is no change required

Config

Helidon MP

When using MP Config through the API, there are no backward incompatible changes in Helidon.

Helidon SE Config Usage

The following changes are relevant when using Helidon Config:

File watching is now done through a ChangeWatcher - use of PollingStrategies.watch() needs to be refactored to FileSystemWatcher.create() and the method to configure it on config source builder has changed to changeWatcher(ChangeWatcher)
Methods on ConfigSources now return specific builders (they use to return AbstractParsableConfigSource.Builder with a complex type declaration). If you store such a builder in a variable, either change it to the correct type, or use var
Some APIs were cleaned up to be aligned with the development guidelines of Helidon. When using Git config source, or etcd config source, the factory methods moved to the config source itself, and the builder now accepts all configuration options through methods
The API of config source builders has been cleaned, so now only methods that are relevant to a specific config source type can be invoked on such a builder. Previously you could configure a polling strategy on a source that did not support polling
There is a small change in behavior of Helidon Config vs. MicroProfile config: The MP TCK require that system properties are fully mutable (e.g. as soon as the property is changed, it must be used), so MP Config methods work in this manner (with a certain performance overhead). Helidon Config treats System properties as a mutable config source, with a (optional) time based polling strategy. So the change is reflected as well, though not immediately (this is only relevant if you use change notifications).
CompositeConfigSource has been removed from Config. If you need to configure MerginStrategy, you can do it now on Config Builder

Helidon SE Config Extensibility

Meta configuration has been refactored to be done through ServiceLoader services. If you created a custom ConfigSource, PollingStrategy or RetryPolicy, please have a look at the new documentation.
To implement a custom config source, you need to choose appropriate (new) interface(s) to implement. This is the choice: From "how we obtain the source of data" point of view:
- ParsableSource - for sources that provide bytes (used to be reader, now InputStream)
- NodeConfigSource - for sources that provide a tree structure directly
- LazyConfigSource - for sources that cannot read the full config tree in advance From mutability point of view (immutable config sources can ignore this):
- PollableSource - a config source that is capable of identifying a change based on a data "stamp"
- WatchableSource - a config source using a target that can be watched for changes without polling (such as Path)
- EventConfigSource - a config source that can trigger change events on its own
AbstractConfigSource and AbstractConfigSourceBuilder are now in package io.helidon.config
ConfigContext no longer contains method to obtain a ConfigParser, as this is no longer responsibility of a config source
Do not throw an exception when config source does not exist, just return an empty Optional from load method, or false from exists() method
Overall change support is handled by the config module and is no longer the responsibility of the config source, just implement appropriate SPI methods if changes are supported, such as PollableSource.isModified(Object stamp)

Metrics

Helidon now supports only MicroProfile Metrics 2.x. Modules for Metrics 1.x were removed, and modules for 2.x were renamed from metrics2 to metrics.

Security

When OIDC provider is configured to use cookie (default configuration) to carry authentication information, the cookie Same-Site is now set to Lax (used to be Strict). This is to prevent infinite redirects, as browsers would refuse to set the cookie on redirected requests (due to this setting). Only in case the frontend host and identity host match, we leave Strict as the default

Microprofile Bundles

We have removed all versioned MP bundles (i.e. helidon-microprofile-x.x, and introduced unversioned core and full bundles:

io.helidon.microprofile.bundles:helidon-microprofile-core - contains only MP Server and Config. Allows you to add only the specifications needed by your application.
io.helidon.microprofile.bundles:helidon-microprofile - contains the latest full MicroProfile version implemented by Helidon

You can find more information in this blog post: New Maven bundles

Helidon CDI and MicroProfile Server

You cannot start CDI container yourself (this change is required so we can support GraalVM native-image)
- You can only run a single instance of Server in a JVM
- If you use SeContainerInitializer you would get an exception
  - this can be worked around by configuration property mp.initializer.allow=true, and warning can be removed using mp.initializer.no-warn=true
  - once SeContainerInitializer is used, you can no longer use MP with native-image
You can no longer provide a Context instance, root context is now built-in
MpService and MpServiceContext have been removed
- methods from context have been moved to JaxRsCdiExtension and ServerCdiExtension that can be accessed from CDI extension through BeanManager.getExtension.
- methods register can be used on current io.helidon.context.Context
- MpService equivalent is a CDI extension. All Helidon services were refactored to CDI extension (you can use these for reference)
Server.cdiContainer is removed, use CDI.current() instead

Startup

New recommended option to start Helidon MP:

Use class io.helidon.microprofile.cdi.Main
Use meta configuration option when advanced configuration of config is required (e.g. meta-config.yaml)
Put logging.properties on the classpath or in the current directory to be automatically picked up to configure Java util logging

io.helidon.microprofile.server.Main is still available, just calls io.helidon.microprofile.cdi.Main and is deprecated. io.helidon.microprofile.server.Server is still available, though the features are much reduced

MicroProfile JWT-Auth

If a JAX-RS application exists that is annotated with @LoginConfig with value MP-JWT, the correct authentication provider is added to security. The startup would fail if the provider is required yet not configured.

Security in MP

If there is no authentication provider configured, authentication will always fail. If there is no authorization provider configured, ABAC provider will be configured. (original behavior - these were configured if there was no provider configured overall)

Other Behavior changes

JAX-RS applications now work similar to how they work in application servers
- if there is an Application subclass that returns anything from getClasses or getSingletons, it is used as is
- if there is an Application subclass that returns empty sets from these methods, all available resource classes will be part of such an application
- if there is no Application subclass, a synthetic application will be created with all available resource classes
- Application subclasses MUST be annotated with @ApplicationScoped, otherwise they are ignored

Files

CHANGELOG.md

Latest commit

History

CHANGELOG.md

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Changelog

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CHANGES

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MP Config Updates

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Compatibility

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Compatibility

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Changes

Fixes

Notable New Features

Changes

Backward incompatible changes

Thank You!

Notes

Notable New Features

Changes

Backward incompatible changes

WebClient and WebServer TLS class names aligned

Thank You!

Notes

Notable New Features

Changes

Backward incompatible changes

gRPC: Renamed several annotations and classes

Internal helidon-common-metrics and Related Classes Removed

Notes

Notable New Features

Changes

Thank You!

Backward incompatible changes

Removal of processor-like operators

Removal of Flows

MediaSupport refactored

Also See M1 and M2 Notes

Notes

Notable New Features

Changes

Thank You!

Backward incompatible changes

Resource class when loaded from Config

OidcConfig

JwtProvider and JwtAuthProvider

GrpcTlsDescriptor

KeyConfig

Notes

Improvements

Fixes

Backward incompatible changes

Java Runtime

Common

Tracing

Config

Helidon MP

Helidon SE Config Usage

Helidon SE Config Extensibility

Internal `helidon-common-metrics` and Related Classes Removed