@gradinac -- Hey, thanks for making those changes. It works great for the simple test repo!

I just tried it on a more complex repo of tests here: https://github.com/dzou/java-pubsub
(To try locally, cd google-cloud-pubsub and run mvn test -Pnative.)

I am getting an error that looks like this:

[junit-platform-native] Running in 'test discovery' mode. Note that this is a fallback mode.
Fatal error:org.junit.platform.commons.JUnitException: TestEngine with ID 'junit-vintage' failed to discover tests
	at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:111)
	at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:85)
	at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:92)
	at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:67)
	at org.graalvm.junit.platform.JUnitPlatformFeature.registerTestPlan(JUnitPlatformFeature.java:121)
	at org.graalvm.junit.platform.JUnitPlatformFeature.beforeAnalysis(JUnitPlatformFeature.java:89)
	at com.oracle.svm.hosted.NativeImageGenerator.lambda$runPointsToAnalysis$7(NativeImageGenerator.java:701)
	at com.oracle.svm.hosted.FeatureHandler.forEachFeature(FeatureHandler.java:70)
	at com.oracle.svm.hosted.NativeImageGenerator.runPointsToAnalysis(NativeImageGenerator.java:701)
	at com.oracle.svm.hosted.NativeImageGenerator.doRun(NativeImageGenerator.java:563)
	at com.oracle.svm.hosted.NativeImageGenerator.lambda$run$0(NativeImageGenerator.java:476)
	at java.base/java.util.concurrent.ForkJoinTask$AdaptedRunnableAction.exec(ForkJoinTask.java:1407)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
Caused by: java.lang.NoClassDefFoundError: org/apache/log/Logger
	at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
	at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3166)
	at java.base/java.lang.Class.privateGetPublicMethods(Class.java:3191)
	at java.base/java.lang.Class.getMethods(Class.java:1904)
	at org.junit.platform.commons.util.ReflectionUtils.getDefaultMethods(ReflectionUtils.java:1481)
	at org.junit.platform.commons.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:1454)
	at org.junit.platform.commons.util.ReflectionUtils.findAllMethodsInHierarchy(ReflectionUtils.java:1396)
	at org.junit.platform.commons.util.ReflectionUtils.findMethods(ReflectionUtils.java:1380)
	at org.junit.platform.commons.util.ReflectionUtils.findMethods(ReflectionUtils.java:1366)
	at org.junit.vintage.engine.descriptor.TestSourceProvider.lambda$findMethod$1(TestSourceProvider.java:64)
	at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1133)
	at java.base/java.util.Collections$SynchronizedMap.computeIfAbsent(Collections.java:2682)
	at org.junit.vintage.engine.descriptor.TestSourceProvider.findMethod(TestSourceProvider.java:64)
	at org.junit.vintage.engine.descriptor.TestSourceProvider.findTestSource(TestSourceProvider.java:45)
	at org.junit.vintage.engine.discovery.RunnerTestDescriptorPostProcessor.addChildrenRecursively(RunnerTestDescriptorPostProcessor.java:63)
	at org.junit.vintage.engine.discovery.RunnerTestDescriptorPostProcessor.applyFiltersAndCreateDescendants(RunnerTestDescriptorPostProcessor.java:45)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at org.junit.vintage.engine.discovery.VintageDiscoverer.discover(VintageDiscoverer.java:50)
	at org.junit.vintage.engine.VintageTestEngine.discover(VintageTestEngine.java:63)
	at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:103)
	... 16 more
Caused by: java.lang.ClassNotFoundException: org.apache.log.Logger
	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 46 more

I guess the puzzling part is that the class it is complaining about org.apache.log.Logger isn't on my project classpath; I'm curious if you might have seen a similar issue before.

I have also gotten this error for the com.oracle.mxtool.junit.MxJUnitRequest$Builder if you try running the mvn test -Pnative command at the root directory of this (junit4 branch): https://github.com/dzou/junit4-experiment/tree/junit4
Also not on my classpath. I'm wondering where these classes are coming from.

Support JUnit 4 via the VintageTestEngine #53

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