Java 9 support

[cushon]

The gwtmockito tests fail when using JDK 9:

JAVA_HOME=<path to JDK 9> mvn clean package

``` com.google.gwtmockito.GwtMockitoTest Time elapsed: 0.323 sec <<< ERROR! java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at com.google.gwtmockito.GwtMockitoTestRunner.withBefores(GwtMockitoTestRunner.java:391) at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:276) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at com.google.gwtmockito.GwtMockitoTestRunner.run(GwtMockitoTestRunner.java:372) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:563) at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189) at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165) at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85) at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75) Caused by: java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:563) at com.google.gwtmockito.GwtMockitoTestRunner.withBefores(GwtMockitoTestRunner.java:389) ... 22 more Caused by: java.lang.ExceptionInInitializerError at org.mockito.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:167) at org.mockito.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) at org.mockito.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:217) at org.mockito.cglib.core.KeyFactory$Generator.create(KeyFactory.java:145) at org.mockito.cglib.core.KeyFactory.create(KeyFactory.java:117) at org.mockito.cglib.core.KeyFactory.create(KeyFactory.java:109) at org.mockito.cglib.core.KeyFactory.create(KeyFactory.java:105) at org.mockito.cglib.proxy.Enhancer.(Enhancer.java:70) at org.powermock.api.mockito.repackaged.ClassImposterizer.createProxyClass(ClassImposterizer.java:96) at org.powermock.api.mockito.repackaged.ClassImposterizer.imposterise(ClassImposterizer.java:58) at org.powermock.api.mockito.repackaged.ClassImposterizer.imposterise(ClassImposterizer.java:50) at org.powermock.api.mockito.repackaged.CglibMockMaker.createMock(CglibMockMaker.java:25) at org.powermock.api.mockito.internal.mockmaker.PowerMockMaker.createMock(PowerMockMaker.java:47) at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:33) at org.mockito.internal.MockitoCore.mock(MockitoCore.java:59) at org.mockito.Mockito.mock(Mockito.java:1285) at org.mockito.Mockito.mock(Mockito.java:1163) at com.google.gwtmockito.GwtMockito.registerGwtMocks(GwtMockito.java:203) at com.google.gwtmockito.GwtMockito.initMocks(GwtMockito.java:133) ... 27 more Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @2f1de2d6 at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:337) at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:281) at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:197) at java.base/java.lang.reflect.Method.setAccessible(Method.java:191) at org.mockito.cglib.core.ReflectUtils$2.run(ReflectUtils.java:57) at java.base/java.security.AccessController.doPrivileged(Native Method) at org.mockito.cglib.core.ReflectUtils.(ReflectUtils.java:47) ... 46 more ```

\ Updating the javassist dependency to 3.22.0-GA (which add Java 9 support) causes different failures:

``` Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.149 sec <<< FAILURE! initializationError(com.google.gwtmockito.GwtMockitoTest) Time elapsed: 0 sec <<< ERROR! java.lang.NoClassDefFoundError: Lcom/google/gwtmockito/GwtMockitoTest$SampleInterface; at java.base/java.lang.Class.getDeclaredFields0(Native Method) at java.base/java.lang.Class.privateGetDeclaredFields(Class.java:3014) at java.base/java.lang.Class.getDeclaredFields(Class.java:2218) at org.junit.runners.model.TestClass.getSortedDeclaredFields(TestClass.java:77) at org.junit.runners.model.TestClass.scanAnnotatedMembers(TestClass.java:70) at org.junit.runners.model.TestClass.(TestClass.java:57) at com.google.gwtmockito.GwtMockitoTestRunner.(GwtMockitoTestRunner.java:160) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:487) at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104) at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86) at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59) at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26) at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59) at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:250) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:563) at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189) at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165) at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85) at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75) Caused by: java.lang.ClassNotFoundException: caught an exception while obtaining a class file for com.google.gwtmockito.GwtMockitoTest$SampleInterface at javassist.Loader.findClass(Loader.java:357) at com.google.gwtmockito.GwtMockitoTestRunner$GwtMockitoClassLoader.findClass(GwtMockitoTestRunner.java:420) at javassist.Loader.loadClass(Loader.java:309) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:473) ... 29 more Caused by: java.lang.RuntimeException: com.google.gwtmockito.GwtMockitoTest class is frozen at javassist.CtClassType.checkModify(CtClassType.java:309) at javassist.CtClassType.updateInnerEntry(CtClassType.java:475) at javassist.CtClassType.updateInnerEntry(CtClassType.java:481) at javassist.CtClassType.setModifiers(CtClassType.java:457) at com.google.gwtmockito.GwtMockitoTestRunner$GwtMockitoClassLoader.onLoad(GwtMockitoTestRunner.java:429) at javassist.Loader.findClass(Loader.java:338) ... 32 more ```

[ghost]

@cushon @ekuefler I would like to look into this issue and fix it. Please let me know if I can go ahead with it.

[ekuefler]

I think this should be fixed in 1.1.8. Are you still seeing any problems with Java 9?