Exception in code generation on Java 22 - NoSuchMethodError: void sun.misc.Unsafe.ensureClassInitialized

[edward3h]

I created a minimal Gradle project to demonstrate the issue. https://github.com/edward3h/pkl-java22-unsafe

When using the pkl code generator in Gradle, on Java 22, I get an exception where this is the root cause:

Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.NoSuchMethodError: 'void sun.misc.Unsafe.ensureClassInitialized(java.lang.Class)' [in thread "Execution worker Thread 2"]
        at org.pkl.thirdparty.truffle.api.library.LibraryFactory.ensureLibraryInitialized(LibraryFactory.java:384)
        at org.pkl.thirdparty.truffle.api.library.LibraryFactory.getUncached(LibraryFactory.java:364)
        at org.pkl.thirdparty.truffle.api.library.LibraryFactory.<init>(LibraryFactory.java:210)
        at org.pkl.thirdparty.truffle.api.interop.InteropLibraryGen.<init>(InteropLibraryGen.java:178)
        at org.pkl.thirdparty.truffle.api.interop.InteropLibraryGen.<clinit>(InteropLibraryGen.java:169)
        at org.pkl.thirdparty.truffle.api.library.LibraryFactory.loadGeneratedClass(LibraryFactory.java:791)
        at org.pkl.thirdparty.truffle.api.library.LibraryFactory.resolveImpl(LibraryFactory.java:740)
        at org.pkl.thirdparty.truffle.api.library.LibraryFactory.resolve(LibraryFactory.java:733)
        at org.pkl.thirdparty.truffle.api.interop.InteropLibrary.<clinit>(InteropLibrary.java:2941)
        at org.pkl.thirdparty.truffle.polyglot.PolyglotValueDispatch.<clinit>(PolyglotValueDispatch.java:170)
        at org.pkl.thirdparty.truffle.polyglot.PolyglotImpl.initialize(PolyglotImpl.java:166)
        at org.pkl.thirdparty.graalvm.polyglot.impl.AbstractPolyglotImpl.setConstructors(AbstractPolyglotImpl.java:288)
        at org.pkl.thirdparty.graalvm.polyglot.Engine$1.loadAndValidateProviders(Engine.java:1107)
        at org.pkl.thirdparty.graalvm.polyglot.Engine$1.run(Engine.java:1067)
        at org.pkl.thirdparty.graalvm.polyglot.Engine$1.run(Engine.java:1061)
        at org.pkl.thirdparty.graalvm.polyglot.Engine.initEngineImpl(Engine.java:1061)
        at org.pkl.thirdparty.graalvm.polyglot.Engine$ImplHolder.<clinit>(Engine.java:143)
        at org.pkl.thirdparty.graalvm.polyglot.Engine.getImpl(Engine.java:367)
        at org.pkl.thirdparty.graalvm.polyglot.Engine$Builder.build(Engine.java:665)
        at org.pkl.core.runtime.VmUtils.<clinit>(VmUtils.java:74)

My projects work ok on Java 21.

[holzensp]

This is a bug report for GraalVM/Truffle, I'm afraid. Pkl runs on GraalVM 23, which is compatible with JDK 17-21. I expect this to simply go away when we bump to a future GraalVM version that supports Java 22.

[sin-ack]

FYI, based on this page it appears that Truffle 24+ supports Java 23 now: https://docs.oracle.com/en/graalvm/jdk/23/docs/release-notes/#platform-and-distributions

[translatenix]

I think the problem is that Truffle 24+ doesn't support older Java versions.
I have some ideas on how to support a wider range of Java versions and avoid getting stuck on EOL'd Truffle/Graal versions.
I'll start a discussion after the 0.27 release.