Fixed getResourceAsStream

[christiangoerdes]

Membrane did not start when packaged in jar:

Membrane Router running...
16:09:03,482  INFO 1 main OpenAPIRecordFactory:83 - Parsing spec fruitshop-api.yml
org.springframework.context.ApplicationContextException: Failed to start bean 'router'
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:288)
	at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:472)
	at java.base/java.lang.Iterable.forEach(Iterable.java:75)
	at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:257)
	at org.springframework.context.support.DefaultLifecycleProcessor.start(DefaultLifecycleProcessor.java:170)
	at org.springframework.context.support.AbstractApplicationContext.start(AbstractApplicationContext.java:1530)
	at com.predic8.membrane.core.Router.init(Router.java:147)
	at com.predic8.membrane.core.RouterCLI.main(RouterCLI.java:39)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at com.predic8.membrane.core.Starter.main(Starter.java:47)
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
	at com.predic8.membrane.core.Router.start(Router.java:316)
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:285)
	... 10 more
Caused by: java.lang.NullPointerException
	at java.base/java.io.FileInputStream.<init>(FileInputStream.java:144)
	at java.base/java.io.FileInputStream.<init>(FileInputStream.java:106)
	at com.predic8.membrane.core.openapi.util.Utils.getResourceAsStream(Utils.java:230)
	at com.predic8.membrane.core.openapi.serviceproxy.OpenAPIPublisherInterceptor.createTemplate(OpenAPIPublisherInterceptor.java:72)
	at com.predic8.membrane.core.openapi.serviceproxy.OpenAPIPublisherInterceptor.<init>(OpenAPIPublisherInterceptor.java:66)
	at com.predic8.membrane.core.openapi.serviceproxy.APIProxy.initOpenAPI(APIProxy.java:96)
	at com.predic8.membrane.core.openapi.serviceproxy.APIProxy.init(APIProxy.java:82)
	at com.predic8.membrane.core.rules.AbstractProxy.init(AbstractProxy.java:163)
	at com.predic8.membrane.core.Router.initRemainingRules(Router.java:269)
	at com.predic8.membrane.core.Router.init(Router.java:263)
	at com.predic8.membrane.core.Router.start(Router.java:288)
	... 11 more

[membrane-ci-server]

This pull request needs "/ok-to-test" from an authorized committer.

[christiangoerdes]

/ok-to-test