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POPowerMock - NPE on @PrepareForTest
 

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    <p>Problem: The instrumentation class in PowerMock isn't being initialized. I'm loading the library through the @Rule annotation. I've got the VM argument in place: -javaagent:project_path/libs/powermock-module-javaagent-1.5.jar</p> <p>When I walk through with the debugger, PowerMockAgent#premain gets called and the instrumentation object gets set, but when it's called during the test setup, the instrumentation object is null, throwing the error below. </p> <p>Why is the instrumentation variable not keeping it's value between when PowerMockAgent#premain is called and when PowerMockClassRedefiner.redefine calls it?</p> <p><strong>Instrumentation gets set correctly here on load:</strong></p> <pre><code> private static void initialize(String agentArgs, Instrumentation inst) throws IOException { instrumentation = inst; inst.addTransformer(new DefinalizingClassTransformer(), false); inst.addTransformer(classTransformer, true); } </code></pre> <p><strong>But when called again from @PrepareForTest({ Logger.class }), is null</strong></p> <pre><code>public class PowerMockClassRedefiner { public static void redefine(Class&lt;?&gt; cls) { if(cls == null) { throw new IllegalArgumentException("Class to redefine cannot be null"); } PowerMockAgent.getClasstransformer().setClassesToTransform(Arrays.asList(cls.getName())); try { PowerMockAgent.instrumentation().retransformClasses(cls); } catch(Exception e){ throw new RuntimeException("Failed to redefine class "+cls.getName(), e); } } </code></pre> <p>Resulting in error: </p> <pre><code>java.lang.RuntimeException: Failed to redefine class com.testapp.Logger at org.powermock.modules.agent.PowerMockClassRedefiner.redefine(PowerMockClassRedefiner.java:33) at org.powermock.modules.agent.PowerMockClassRedefiner.redefine(PowerMockClassRedefiner.java:42) at com.testapp.testFramework.PowerMockRuleAgentSetup.redefine(PowerMockRuleAgentSetup.java:29) at com.testapp.testFramework.PowerMockRuleAgentSetup.initialize(PowerMockRuleAgentSetup.java:19) at com.testapp.testFramework.PowerMockOverriderRule.apply(PowerMockOverriderRule.java:19) at org.junit.runners.BlockJUnit4ClassRunner.withMethodRules(BlockJUnit4ClassRunner.java:341) at org.junit.runners.BlockJUnit4ClassRunner.withRules(BlockJUnit4ClassRunner.java:330) at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:248) at com.xtremelabs.robolectric.RobolectricTestRunner.methodBlock(RobolectricTestRunner.java:287) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.NullPointerException at org.powermock.modules.agent.PowerMockClassRedefiner.redefine(PowerMockClassRedefiner.java:31) ... 22 more </code></pre> <p>Here's my test setup:</p> <pre><code>@RunWith(RobolectricTestRunner.class) @PrepareForTest({ Logger.class }) // THIS IS WHERE THE ERROR GETS THROWN public class LoggerTest { @Rule public PowerMockOverriderRule rule = new PowerMockOverriderRule(); public LoggerConfig config; @Before public void setUp() { config = mock(LoggerConfig.class); } </code></pre> <p>UPDATE: Removing the @RunWith(RobolectricTestRunner.class) fixes the problem, but isn't an option for my project. (It's an Android project).</p>
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    1. CODid you try `@Rule public PowerMockRule rule = new PowerMockRule();` as stated in the [PowerMock Wiki](http://code.google.com/p/powermock/wiki/PowerMockRule)?
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    2. COYes, but this static block in the PowerMockRule class prevents that from getting anywhere off the ground: `static { if(PowerMockRule.class.getClassLoader() != ClassLoader.getSystemClassLoader()) { throw new IllegalStateException("PowerMockRule can only be used with the system classloader but was loaded by "+PowerMockRule.class.getClassLoader()); } PowerMockAgent.initializeIfPossible(); }`
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