Graal native image support

Currently even with Graal snapshots it fails with following error:

mx native-image -Dio.netty.noUnsafe=true -H:ReflectionConfigurationFiles=/home/seb/workspace/spring-fu/samples/simple-webapp/graal.json -H:+ReportUnsupportedElementsAtRuntime -Dfile.encoding=UTF-8  -jar /home/seb/workspace/spring-fu/samples/simple-webapp/build/libs/simple-webapp-all.jar 
   classlist:  10,845.71 ms
       (cap):   3,785.48 ms
       setup:   7,078.43 ms
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Jun 05, 2018 2:48:49 PM io.netty.util.internal.PlatformDependent <clinit>
INFO: Your platform does not provide complete low-level API for accessing direct buffers reliably. Unless explicitly requested, heap buffer will always be preferred to avoid potential system instability.
    analysis:  38,365.98 ms
fatal error: java.lang.reflect.MalformedParameterizedTypeException
	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:381)
	at com.oracle.svm.hosted.NativeImageGeneratorRunner.buildImage(NativeImageGeneratorRunner.java:281)
	at com.oracle.svm.hosted.NativeImageGeneratorRunner.build(NativeImageGeneratorRunner.java:378)
	at com.oracle.svm.hosted.NativeImageGeneratorRunner.main(NativeImageGeneratorRunner.java:104)
Caused by: java.lang.reflect.MalformedParameterizedTypeException
	at sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl.validateConstructorArguments(ParameterizedTypeImpl.java:58)
	at sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl.<init>(ParameterizedTypeImpl.java:51)
	at sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl.make(ParameterizedTypeImpl.java:92)
	at sun.reflect.generics.factory.CoreReflectionFactory.makeParameterizedType(CoreReflectionFactory.java:105)
	at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:140)
	at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
	at sun.reflect.generics.repository.ClassRepository.getSuperInterfaces(ClassRepository.java:108)
	at java.lang.Class.getGenericInterfaces(Class.java:913)
	at com.oracle.svm.hosted.analysis.Inflation.fillGenericInfo(Inflation.java:240)
	at com.oracle.svm.hosted.analysis.Inflation.checkType(Inflation.java:148)
	at java.lang.Iterable.forEach(Iterable.java:75)
	at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1080)
	at com.oracle.svm.hosted.analysis.Inflation.checkObjectGraph(Inflation.java:125)
	at com.oracle.graal.pointsto.BigBang.checkObjectGraph(BigBang.java:582)
	at com.oracle.graal.pointsto.BigBang.finish(BigBang.java:554)
	at com.oracle.svm.hosted.NativeImageGenerator.doRun(NativeImageGenerator.java:642)
	at com.oracle.svm.hosted.NativeImageGenerator.lambda$run$0(NativeImageGenerator.java:364)
	at java.util.concurrent.ForkJoinTask$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: Image building with exit status 1

graal.json

[
  {
    "name" : "io.netty.channel.socket.nio.NioSocketChannel",
    "methods" : [
      { "name" : "<init>", "parameterTypes" : [] }
    ]
  },
  {
    "name" : "io.netty.channel.socket.nio.NioServerSocketChannel",
    "methods" : [
      { "name" : "<init>", "parameterTypes" : [] }
    ]
  }
]

We need to report this kind of issues to Graal project and provide custom spring-fu.json reflection configuration in order to provide first class support for native images.

[sdeleuze]

Spring Fu minimal webapp is now compiling to a native image successfully with Graal 1.0.0.RC2, Kotlin 1.2.60 (will also work with 1.2.51) and Netty!!!

Startup time is 33 ms with Graal (to be compared with 900 ms with Java 10). The self-sufficient executable size is 50 MB but we will maybe be able to reduce it via #34.

Jetty also works.

[sdeleuze]

I reopen this issue since https://github.com/oracle/graal/issues/655 regression makes it impossible to compile a Spring Fu webapp with Graal 1.0.0-RC6.