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javajunitjmockit

Jmockit NullPointerException with Junit

I'm trying to run a test that written by another programmer with JUnit in eclipse-indigo, and he is sure it works but when I try Jmockit there is a failure and I can't find a solution, yet.

I try to change jmockit.jar in classpath but not working. Do you have any idea about this problem?

Edit: When I use "ant test" in terminal there is no problem but if I click run as > JUnit test in my IDE I got this error.

Exception in thread "(Attach Listener)" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:323)
at sun.instrument.InstrumentationImpl.loadClassAndCallAgentmain(InstrumentationImpl.java:348)
Caused by: java.lang.NullPointerException
at mockit.internal.state.TestRun.getInstance(TestRun.java:40)
at mockit.internal.state.TestRun.mockFixture(TestRun.java:111)
at mockit.internal.ClassFile.createClassFileReader(ClassFile.java:33)
at mockit.internal.annotations.AnnotatedMockMethodCollector.collectMockMethods(AnnotatedMockMethodCollector.java:39)
at mockit.internal.RedefinitionEngine.<init>(RedefinitionEngine.java:86)
at mockit.internal.RedefinitionEngine.<init>(RedefinitionEngine.java:110)
at mockit.internal.startup.Startup.setUpInternalStartupMock(Startup.java:130)
at mockit.internal.startup.Startup.loadInternalStartupMocksForJUnitIntegration(Startup.java:112)
at mockit.internal.startup.Startup.initialize(Startup.java:79)
at mockit.internal.startup.Startup.agentmain(Startup.java:69)
... 6 more
Agent failed to start!
[WARN ][load   ] agent library 'instrument' failed to init with result: 102
java.lang.RuntimeException: com.sun.tools.attach.AgentInitializationException: Agent JAR loaded but agent failed to initialize
at mockit.internal.startup.JDK6AgentLoader.loadAgentAndDetachFromThisVM(JDK6AgentLoader.java:130)
at mockit.internal.startup.JDK6AgentLoader.loadAgent(JDK6AgentLoader.java:80)
at mockit.internal.startup.AgentInitialization.initializeAccordingToJDKVersion(AgentInitialization.java:41)
at mockit.internal.startup.Startup.initializeIfNeeded(Startup.java:244)
at org.junit.runner.Runner.<clinit>(Runner.java:25)
at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:13)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:30)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:32)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:41)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:31)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:455)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:684)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:391)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: com.sun.tools.attach.AgentInitializationException: Agent JAR loaded but agent failed to initialize
at sun.tools.attach.HotSpotVirtualMachine.loadAgent(HotSpotVirtualMachine.java:122)
at mockit.internal.startup.JDK6AgentLoader.loadAgentAndDetachFromThisVM(JDK6AgentLoader.java:123)
at mockit.internal.startup.JDK6AgentLoader.loadAgent(JDK6AgentLoader.java:81)
... 16 more
java.lang.NoClassDefFoundError: org/junit/internal/runners/ErrorReportingRunner
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:32)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:41)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:31)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
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)
Solution

  • As you stated in your comment you set an extra argument to the execution in ant.
    Try setting

    -javaagent:libtest/jmockit.jar

    as a VM Argument (its the second input field on the Arguments tab) in the launch configuration for your junit test.

    And make sure that the classpath is the same as in ant.

    enter image description here