java - Junit:使用 PowerMock 的 MethodNotFoundException

Question

在运行基于 DBUnit 的 junit 测试用例时，出现以下异常:

java.lang.RuntimeException: Invoking the beforeTestMethod method on PowerMock test listener org.powermock.api.extension.listener.AnnotationEnabler@2a5f1994 failed.
    at org.powermock.tests.utils.impl.PowerMockTestNotifierImpl.notifyBeforeTestMethod(PowerMockTestNotifierImpl.java:92)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:292)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
    at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:84)
    at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:118)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:102)
    at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
    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: org.powermock.reflect.exceptions.MethodNotFoundException: No method found with name 'assertNoAnnotations' with parameter types: [ java.lang.reflect.Field, [Ljava.lang.Class; ] in class org.powermock.api.mockito.internal.configuration.PowerMockitoInjectingAnnotationEngine.
    at org.powermock.reflect.internal.WhiteboxImpl.throwExceptionIfMethodWasNotFound(WhiteboxImpl.java:1247)
    at org.powermock.reflect.internal.WhiteboxImpl.findMethodOrThrowException(WhiteboxImpl.java:985)
    at org.powermock.reflect.internal.WhiteboxImpl.doInvokeMethod(WhiteboxImpl.java:882)
    at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:713)
    at org.powermock.reflect.Whitebox.invokeMethod(Whitebox.java:401)
    at org.powermock.api.mockito.internal.configuration.PowerMockitoInjectingAnnotationEngine.process(PowerMockitoInjectingAnnotationEngine.java:45)
    at org.powermock.api.extension.listener.AnnotationEnabler.injectSpiesAndInjectToSetters(AnnotationEnabler.java:55)
    at org.powermock.api.extension.listener.AnnotationEnabler.beforeTestMethod(AnnotationEnabler.java:50)
    at org.powermock.tests.utils.impl.PowerMockTestNotifierImpl.notifyBeforeTestMethod(PowerMockTestNotifierImpl.java:90)
    ... 18 more

我的类(class)看起来像:

@RunWith(PowerMockRunner.class)
public class SampleDbTest extends {

    /** service mock */
    @InjectMocks
    private TestService testService;

    /** entity manager. */
    EntityManager                    entityManager;

    /**
     * Sets the up.
     * 
     * @throws Exception the exception
     */
    @Before
    public final void setUp() throws Exception {
        // get entity manager
        injectField(testService, "entityManager", entityManager);
    }
    ....
    ....

这里的 TestService 是无状态 session bean 接口(interface)。对于这个奇怪的异常，我无法在任何地方找到任何解释。如果您有任何想法，请告诉我。

谢谢。

Answer 1

我认为您使用的 PowerMock 和 Mockito 版本不兼容。

如果您查看堆栈跟踪，您会发现 PowerMockitoInjectingAnnotationEngine 抛出了该异常，并且此类找不到 assertNoAnnotations 方法。

Powermock 的最新版本是 1.5.6。因此，现在查看此类的旧版本 PowerMock(1.4.12，例如)的 src，您会看到已处理 assertNoAnnotations 方法的调用。从 1.5 开始版本，此类不使用此类调用。

Mockito 的最新版本是 1.9.5。现在，如果您查看 1.9.0 的 InjectingAnnotationEngine(由 PowerMockitoInjectingAnnotationEngine 扩展)的 src Mockito 的版本，你会看到，有 assertNoAnnotations 方法持续存在。并且，在 1.9.5 version - 这个方法没有了。

我认为，您将通过更新您使用的框架版本来消除此错误。