Gradle JRE vs JDK请从JDK添加lib/tools.jar

Question

我正在用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,这就是为什么它找不到tools.jar.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？我也尝试使用gradle.properties文件中的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上运行它.

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 

Answer 1

这不是JDK与JRE的问题.JAVA_HOMEvs 的值java.home是正确的和预期的(参见关于该主题的其他SO问题).tools.jar有必要执行诸如javac和之类的工具javadoc.但是,JDK的javac命令行编译器和Gradle的JavaCompile任务都不会自动放在tools.jar用户代码的编译类路径上.相反,你必须明确地添加它.例如:

def jdkHome = System.getenv("JAVA_HOME")

dependencies {
    compile files("$jdkHome/lib/tools.jar")
}