Class incompatibility problem using plain scala

[valdo404]

Hi people,

how are you ? Greetings from france ;)

object Main extends App {
    println("Hello, world!")
}

won't work and fails with this exception at build time:

Build on Server(pid: 30703, port: 26681)
SendBuildRequest [
-task=com.oracle.svm.hosted.NativeImageGeneratorRunner
-imagecp
/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/svm/builder/svm.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/svm/builder/objectfile.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/svm/builder/svm-enterprise.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/svm/builder/pointsto.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/jvmci/graal.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/jvmci/enterprise-graal.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/jvmci/jvmci-api.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/jvmci/jvmci-hotspot.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/boot/graaljs-scriptengine.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/boot/graal-sdk.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/svm/library-support-enterprise.jar:/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/svm/library-support.jar:/Users/lvaldes/Projects/jet-test:/Users/lvaldes/Projects/jet-test/target/scala-2.12/jet-test-assembly-0.1.jar
-H:Path=/Users/lvaldes/Projects/jet-test
-H:Class=com.powerspace.graal.Main
-H:Name=jet-test-assembly-0.1
-H:CLibraryPath=/Users/lvaldes/graalvm/graalvm-1.0.0-rc1/Contents/Home/jre/lib/svm/clibraries/darwin-amd64
]
   classlist:   1,676.86 ms
       (cap):   1,200.18 ms
       setup:   1,387.19 ms
    analysis:   1,483.50 ms
fatal error: java.lang.IncompatibleClassChangeError
	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:398)
	at com.oracle.svm.hosted.NativeImageGeneratorRunner.buildImage(NativeImageGeneratorRunner.java:240)
	at com.oracle.svm.hosted.NativeImageGeneratorRunner.build(NativeImageGeneratorRunner.java:337)
	at com.oracle.svm.hosted.server.NativeImageBuildServer.executeCompilation(NativeImageBuildServer.java:378)
	at com.oracle.svm.hosted.server.NativeImageBuildServer.lambda$processCommand$8(NativeImageBuildServer.java:315)
	at com.oracle.svm.hosted.server.NativeImageBuildServer.withJVMContext(NativeImageBuildServer.java:396)
	at com.oracle.svm.hosted.server.NativeImageBuildServer.processCommand(NativeImageBuildServer.java:312)
	at com.oracle.svm.hosted.server.NativeImageBuildServer.processRequest(NativeImageBuildServer.java:256)
	at com.oracle.svm.hosted.server.NativeImageBuildServer.lambda$serve$7(NativeImageBuildServer.java:216)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IncompatibleClassChangeError: com.powerspace.graal.Main and com.powerspace.graal.Main$delayedInit$body disagree on InnerClasses attribute
	at java.lang.Class.getDeclaringClass0(Native Method)
	at java.lang.Class.getDeclaringClass(Class.java:1235)
	at java.lang.Class.getEnclosingClass(Class.java:1277)
	at jdk.vm.ci.hotspot.HotSpotResolvedObjectTypeImpl.getEnclosingType(HotSpotResolvedObjectTypeImpl.java:894)
	at jdk.vm.ci.hotspot.HotSpotResolvedObjectTypeImpl.getEnclosingType(HotSpotResolvedObjectTypeImpl.java:58)
	at com.oracle.graal.pointsto.meta.AnalysisUniverse.createType(AnalysisUniverse.java:284)
	at com.oracle.graal.pointsto.meta.AnalysisUniverse.lookupAllowUnresolved(AnalysisUniverse.java:191)
	at com.oracle.graal.pointsto.meta.AnalysisUniverse.lookup(AnalysisUniverse.java:168)
	at com.oracle.graal.pointsto.meta.AnalysisUniverse.lookup(AnalysisUniverse.java:67)
	at com.oracle.graal.pointsto.infrastructure.UniverseMetaAccess.lookupJavaType0(UniverseMetaAccess.java:87)
	at com.oracle.graal.pointsto.infrastructure.UniverseMetaAccess.lookupJavaType(UniverseMetaAccess.java:78)
	at com.oracle.graal.pointsto.meta.AnalysisMetaAccess.lookupJavaType(AnalysisMetaAccess.java:43)
	at com.oracle.graal.pointsto.AnalysisObjectScanner.forScannedConstant(AnalysisObjectScanner.java:133)
	at com.oracle.graal.pointsto.ObjectScanner.scanConstant(ObjectScanner.java:217)
	at com.oracle.graal.pointsto.ObjectScanner.scanField(ObjectScanner.java:125)
	at com.oracle.graal.pointsto.ObjectScanner.doScan(ObjectScanner.java:263)
	at com.oracle.graal.pointsto.ObjectScanner.finish(ObjectScanner.java:307)
	at com.oracle.graal.pointsto.ObjectScanner.scanBootImageHeapRoots(ObjectScanner.java:78)
	at com.oracle.graal.pointsto.ObjectScanner.scanBootImageHeapRoots(ObjectScanner.java:60)
	at com.oracle.graal.pointsto.BigBang.checkObjectGraph(BigBang.java:581)
	at com.oracle.graal.pointsto.BigBang.finish(BigBang.java:552)
	at com.oracle.svm.hosted.NativeImageGenerator.doRun(NativeImageGenerator.java:653)
	at com.oracle.svm.hosted.NativeImageGenerator.lambda$run$0(NativeImageGenerator.java:381)
	at java.util.concurrent.ForkJoinTask$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)
Error: Processing image build request failed

whereas

object Main {
  def main(args: Array[String]): Unit = {
    println("Hello, world!")
  }
}

works.
Any idea ?

Best regards,
laurent

[cstancu]

Hi Laurent, Thank you for your report. This seems to be a scala compiler bug. See here: scala/bug#10487.

[cstancu]

I'll close this issue since it is not a SubstrateVM bug. Until the scala compiler bug is fixed the workaround that you suggested is the only solution. Feel free to open another issue if you run into other problems.