java Mockito 在创建模拟对象时抛出 NullPointer
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原文地址: http://stackoverflow.com/questions/15638425/
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Mockito throws NullPointer when creating a mock object
提问by Jorn
I have an integration test in which some set up is done using Guice. I'm using Mockito to mock some of the dependencies. This has worked fine for me until now. I needed to use PowerMock for some other dependency. Now Mockito is throwing a NullPointerExceptionwhile loading one of its own classes:
我有一个集成测试，其中一些设置是使用 Guice 完成的。我正在使用 Mockito 来模拟一些依赖项。到目前为止，这对我来说效果很好。我需要将 PowerMock 用于其他一些依赖项。现在 Mockito 正在NullPointerException加载它自己的一个类：
java.lang.ExceptionInInitializerError
at org.mockito.internal.exceptions.stacktrace.ConditionalStackTraceFilter.<init>(ConditionalStackTraceFilter.java:17)
at org.mockito.exceptions.base.MockitoException.filterStackTrace(MockitoException.java:30)
at org.mockito.exceptions.base.MockitoException.<init>(MockitoException.java:19)
at org.mockito.exceptions.misusing.MockitoConfigurationException.<init>(MockitoConfigurationException.java:18)
at org.mockito.internal.configuration.ClassPathLoader.loadImplementations(ClassPathLoader.java:145)
at org.mockito.internal.configuration.ClassPathLoader.findPluginImplementation(ClassPathLoader.java:110)
at org.mockito.internal.configuration.ClassPathLoader.findPlatformMockMaker(ClassPathLoader.java:106)
at org.mockito.internal.configuration.ClassPathLoader.<clinit>(ClassPathLoader.java:59)
at org.mockito.internal.util.MockUtil.<clinit>(MockUtil.java:21)
at org.mockito.internal.MockitoCore.<init>(MockitoCore.java:40)
at org.mockito.Mockito.<clinit>(Mockito.java:932)
<snip my test code and some Guice>
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.ClassRoadie.runBefores(ClassRoadie.java:56)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:43)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:101)
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.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.NullPointerException
at org.mockito.internal.exceptions.stacktrace.StackTraceFilter.<clinit>(StackTraceFilter.java:21)
... 39 more
the (trimmed down) code:
（精简）代码：
@PrepareForTest(MyModule.class)
@RunWith(PowerMockRunner.class)
public class MyTest {
@BeforeClass
public static void setUp() {
Injector injector = Guice.createInjector(...);
MyModule module = PowerMockito.mock(MyModule.class);
injector = injector.createChildInjector(...); // Fails in another Mockito.mock() call before it gets to use the mocked Module.
}
}
I couldn't find anything about this being a known bug in Mockito. Does anyone have a suggestion on how to solve this?
我在 Mockito 中找不到任何关于这是已知错误的信息。有没有人有关于如何解决这个问题的建议？
采纳答案by rajesh
Check this issue
检查这个问题
This seems to happen when a mock is created at instantation time.
If I set up my mocks in an @Before method the issue goes away.
在实例化时创建模拟时似乎会发生这种情况。
如果我在 @Before 方法中设置我的模拟，问题就会消失。
