java - NoClassDefFoundError : org/hamcrest/Matchers using PowerMock-OSGi

Question

当我将测试作为 OSGi 插件测试运行时，我得到了 org.hamcrest.Matchers 的 NoClassDefFoundError，但是当我将它作为普通 JUnit 测试运行时，一切都按预期工作。我正在使用 OSGi version of PowerMock并在我的启动配置中包含所有必要的依赖项。我做错了什么？出于某种原因，Testrunner 似乎没有看到该类。

编辑:我创建了一个简化的示例项目，发现只有在我的类声明中使用 @PrepareForTest(XXX.class) 时才会出现问题。

---

java.lang.NoClassDefFoundError: org/hamcrest/Matchers
    at eu.gemtec.commons.util.assertion.Assert.assertParamNotNull(Assert.java:107)
    at eu.gemtec.eagle.device.aastra.omaxi.core.system.model.impl.MessageHandleFactory.<init>(MessageHandleFactory.java:72)
    at eu.gemtec.eagle.device.aastra.omaxi.core.system.model.impl.TestMessageHandleFactory.setUp(TestMessageHandleFactory.java:74)
    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:601)
    at org.junit.internal.runners.MethodRoadie.runBefores(MethodRoadie.java:132)
    at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:95)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$LastRuleTestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:148)
    at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:168)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:91)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
    at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:86)
    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:33)
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:45)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:118)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:104)
    at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
    at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.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.pde.internal.junit.runtime.RemotePluginTestRunner.main(RemotePluginTestRunner.java:62)
    at org.eclipse.pde.internal.junit.runtime.CoreTestApplication.run(CoreTestApplication.java:23)
    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:601)
    at org.eclipse.equinox.internal.app.EclipseAppContainer.callMethodWithException(EclipseAppContainer.java:587)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:198)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    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:601)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: java.lang.ClassNotFoundException: org.hamcrest.Matchers
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:467)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:65)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    ... 52 more

Answer 1

如果你看一下 update site在 Powermock-osgi 中，您会注意到那里有 hamcrest 和 junit 包。然而，它们不是“正常”的官方发布包，而是包装包，比官方包公开更多包。

如果您使用 Eclipse，工作区的包池是共享的。使用符号名称和版本查找 bundle 。因此，您必须从 powermock-osgi 的更新站点添加 junit 和 hamcrest，并且您必须确定，在解析目标平台之前，您删除了所有工作区的所有包池。

参见 Powermock-OSGI site :

Tycho and Eclipse PDE caches the bundles based on symbolic name andversion. So if the user already had a 4.11 version of Junit anytime inthe past, our hacked powermock version will not be taken.

So before first usage inside Eclipse the user has to delete the.metadata.plugins\org.eclipse.pde.core.bundle_pool and.metadata.plugins\org.eclipse.pde.core.external_libraries in ALLworkspaces of the specific Eclipse installation (bundles are looked upcross workspace way). BE SURE, that when you run the unit tests ineclipse the plugins tab in the launch config REALLY contains theJUnit, Mockito and Hamcrest plugins of the Powermock feature, and notsome other version. Before first usage with Tycho delete the .meta.cache and p2 folders from the maven local repository

如果不是这种情况，请提供以下信息以便我帮助您:

• 您的目标文件为 XML
• 测试片段 list 和主机包 list
• 你的 hamcrest 和 junit 包的大小里面

如果您在 https://code.google.com/p/powermock-osgi/ 提交问题有一个示例项目，我会看一下。

编辑:还有一件事。 OSGI 包中的类 eu.gemtec.commons.util.assertion.Assert 是否将 hamcrest 作为依赖项导入？是否导出了 eu.gemtec.commons.util.assertion 包？

编辑 2:事实证明，我的 hamcrest 的“黑化”powermock-osgi 版本不会将 org.hamcrest 导出为拆分包，这就是问题所在。更新站点的修复程序即将推出。参见 https://code.google.com/p/powermock-osgi/issues/detail?id=2#c4

编辑 3:在 http://powermock-osgi.googlecode.com/svn/updateSite/1.5.4.1 上为 Chriss 提供了用于测试目的的更新站点。

更新:项目已自动迁移到 github。更新站点:https://raw.githubusercontent.com/liptga/powermock-osgi/master/update-site/1.5.6.0

项目地址:https://github.com/liptga/powermock-osgi

感谢 Chriss 协助调查。