I realise I'm right on the bleeding edge, but hope this may be useful in 
getting Jacoco ready for Java 9.

I'm trying to use Jacoco (0.7.7.201606060606) with Java 9 (9-ea+128) and every 
test is failing with an IllegalAccessError thrown from $jacocoInit. Each 
exception looks like this:

java.lang.IllegalAccessError: Update to static final field 
org.springframework.restdocs.RestDocumentationGeneratorTests.$jacocoData 
attempted from a different method 
(org.springframework.restdocs.RestDocumentationGeneratorTests) than the 
initializer method <clinit> 
        at 
org.springframework.restdocs.RestDocumentationGeneratorTests.$jacocoInit(RestDocumentationGeneratorTests.java)
        at 
org.springframework.restdocs.RestDocumentationGeneratorTests.<init>(RestDocumentationGeneratorTests.java)
        at 
jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(java.base@9-ea/Native
 Method)
        at 
jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(java.base@9-ea/NativeConstructorAccessorImpl.java:62)
        at 
jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(java.base@9-ea/DelegatingConstructorAccessorImpl.java:45)
        at 
java.lang.reflect.Constructor.newInstance(java.base@9-ea/Constructor.java:453)
        at 
org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:217)
        at 
org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:266)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:263)
        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$2.evaluate(ParentRunner.java:268)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:114)
        at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:57)
        at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:66)
        at 
org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
        at jdk.internal.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at 
jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-ea/DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(java.base@9-ea/Method.java:533)
        at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
        at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
        at 
org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
        at 
org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
        at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
        at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:109)
        at jdk.internal.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
        at 
jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-ea/DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(java.base@9-ea/Method.java:533)
        at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
        at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
        at 
org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:377)
        at 
org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
        at 
org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@9-ea/ThreadPoolExecutor.java:1158)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@9-ea/ThreadPoolExecutor.java:632)
        at java.lang.Thread.run(java.base@9-ea/Thread.java:843)

The project is OSS and, if it would be useful, I could push a branch that 
recreates the problem.

Thanks,
Andy

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