Gradle JRE vs JDK please add lib/tools.jar from your JDK

Question

I'm running java tests with gradle. here is the exception I have: ``` 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.runRe…

Accepted Answer

Ok, seems that JRE is actually the right one that I need to use. No reason java.home to be set to JDK. So the way I solved it was just adding tools library to my classpath:

```
testCompile ([fileTree(dir: "${System.properties['java.home']}/../lib", include: '*tools.jar'),fileTree(dir: "lib/test", include: '*.jar') ])
```

Initially the reason why I did not wanted to do this was that once I added it I had a bunch of

```
java 7 errors: java.lang.VerifyError: Expecting a stackmap frame at branch target 10
```

I did fix it by adding "-noverify" parameter to my tests closure:

```
Closure basicTestConfiguration = {
jvmArgs "-Dactivemq.directory=${testActivemqDir}",
        "-Duser.timezone=Etc/UTC",
        "-javaagent:${configurations.testAgent.singleFile}",
        "-XX:MaxPermSize=256m",
        "-noverify"
...
}
```

and applying this closure to my test suite:

```
postCommitSuite basicTestConfiguration
```

Gradle JRE vs JDK please add lib/tools.jar from your JDK

Solution

Problem