我正在使用 gradle 运行 java 测试。
这是我的例外：
java.lang.RuntimeException: java.lang.IllegalStateException: Unable to load Java agent; please add lib/tools.jar from your JDK to the classpath
at org.powermock.modules.agent.PowerMockClassRedefiner.redefine(PowerMockClassRedefiner.java:59)
at org.powermock.modules.agent.support.PowerMockAgentTestInitializer.redefine(PowerMockAgentTestInitializer.java:49)
at org.powermock.modules.agent.support.PowerMockAgentTestInitializer.initialize(PowerMockAgentTestInitializer.java:41)
at com.blablacompany.app.weight.WeightMilestonesViewBeanUnitTest.setUpMock(WeightMilestonesViewBeanUnitTest.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:80)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:47)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:69)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:355)
at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Unable to load Java agent; please add lib/tools.jar from your JDK to the classpath
at org.powermock.modules.agent.JDK6AgentLoader.getVirtualMachineImplementationFromEmbeddedOnes(JDK6AgentLoader.java:97)
at org.powermock.modules.agent.JDK6AgentLoader.loadAgent(JDK6AgentLoader.java:70)
at org.powermock.modules.agent.AgentInitialization.initializeAccordingToJDKVersion(AgentInitialization.java:40)
at org.powermock.modules.agent.PowerMockAgent.verifyInitialization(PowerMockAgent.java:83)
at org.powermock.modules.agent.PowerMockAgent.instrumentation(PowerMockAgent.java:76)
at org.powermock.modules.agent.PowerMockClassRedefiner.redefine(PowerMockClassRedefiner.java:57)
... 37 more
事实证明，由于某种原因，我的 gradle 使用 JRE 的文件夹作为 java.home，这就是它找不到 tools.jar 的原因。
我不认为我想手动将它添加到我的类路径中。我想知道是否有办法告诉 gradle 使用 JDK 的 java home 而不是 JRE 的？
我还尝试在 gradle.properties 文件中使用 org.gradle.java.home 覆盖它，但它不起作用。任何帮助是极大的赞赏。
当我从 IDE（Intellij IDEA）运行相同的测试时，所有测试都成功通过。我在 Mac OS 上运行所有这些。
println System.getenv("JAVA_HOME")
println System.properties['java.home']
显示：
/Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home/jre
这不是 JDK 与 JRE 的问题。的价值观JAVA_HOME vs. java.home是正确且符合预期的（请参阅有关此主题的其他 SO 问题）。tools.jar有必要execute工具如javac and javadoc。然而，JDK 的javac命令行编译器也不是 Gradle 的JavaCompile任务会自动放到tools.jar在用户代码的编译类路径上。相反，您必须明确添加它。例如：
def jdkHome = System.getenv("JAVA_HOME")
dependencies {
compile files("$jdkHome/lib/tools.jar")
}
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