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HewlettPackard / kraal

Enables the use of Kotlin coroutines and GraalVM native-image together
MIT License
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Issue with example #1

Closed emrul closed 5 years ago

emrul commented 5 years ago

Hi,

This isn't an issue with Kraal itself but trying to run the example I run into a problem with the Docker build step to create the native image:

Fatal error: java.lang.UnsupportedClassVersionError
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:598)
    at java.util.concurrent.ForkJoinTask.get(ForkJoinTask.java:1005)
    at com.oracle.svm.hosted.NativeImageGenerator.run(NativeImageGenerator.java:427)
    at com.oracle.svm.hosted.NativeImageGeneratorRunner.buildImage(NativeImageGeneratorRunner.java:285)
    at com.oracle.svm.hosted.NativeImageGeneratorRunner.build(NativeImageGeneratorRunner.java:407)
    at com.oracle.svm.hosted.server.NativeImageBuildServer.executeCompilation(NativeImageBuildServer.java:390)
    at com.oracle.svm.hosted.server.NativeImageBuildServer.lambda$processCommand$8(NativeImageBuildServer.java:327)
    at com.oracle.svm.hosted.server.NativeImageBuildServer.withJVMContext(NativeImageBuildServer.java:408)
    at com.oracle.svm.hosted.server.NativeImageBuildServer.processCommand(NativeImageBuildServer.java:324)
    at com.oracle.svm.hosted.server.NativeImageBuildServer.processRequest(NativeImageBuildServer.java:268)
    at com.oracle.svm.hosted.server.NativeImageBuildServer.lambda$serve$7(NativeImageBuildServer.java:228)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.UnsupportedClassVersionError: org/eclipse/jetty/alpn/java/server/JDK9ServerALPNProcessor has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at com.oracle.svm.hosted.ImageClassLoader.forName(ImageClassLoader.java:373)
    at com.oracle.svm.hosted.ImageClassLoader.findClassByName(ImageClassLoader.java:363)
    at com.oracle.svm.hosted.FeatureImpl$FeatureAccessImpl.findClassByName(FeatureImpl.java:100)
    at com.oracle.svm.hosted.ServiceLoaderFeature.handleType(ServiceLoaderFeature.java:203)
    at com.oracle.svm.hosted.ServiceLoaderFeature.duringAnalysis(ServiceLoaderFeature.java:114)
    at com.oracle.svm.hosted.NativeImageGenerator.lambda$runPointsToAnalysis$8(NativeImageGenerator.java:671)
    at com.oracle.svm.hosted.FeatureHandler.forEachFeature(FeatureHandler.java:63)
    at com.oracle.svm.hosted.NativeImageGenerator.runPointsToAnalysis(NativeImageGenerator.java:671)
    at com.oracle.svm.hosted.NativeImageGenerator.doRun(NativeImageGenerator.java:492)
    at com.oracle.svm.hosted.NativeImageGenerator.lambda$run$0(NativeImageGenerator.java:410)
    at java.util.concurrent.ForkJoinTask$AdaptedRunnableAction.exec(ForkJoinTask.java:1386)
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
    at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
emrul commented 5 years ago

For anyone else who might have hit this, I had to exclude the jetty-alpn-java-server server dependency and it then worked fine. Seems that it includes a Java 9 only class which Substrate VM is not able to handle.

bradnewman commented 5 years ago

Yes, this is related to oracle/graal#969 - depending on the build environment for the jar, you may or may not have this problem with the v0.0.14 example - my theory is that it depends on the order of the entries in the jar file.

To deal with this, you can either exclude the alpn dependency, use a GraalVM substitution, or use CIO instead of the Jetty Ktor backend. I will switch the example back to CIO for the moment so others don't encounter this.