使用Powermock模拟类的构造函数时出现ExceptionInInitializerError。 怎么解决？
[英]Got ExceptionInInitializerError when mocking constructor of a class with Powermock. How to fix it?
问题描述
Here is my case. 
这是我的情况。 I have a AbstractController class. 我有一个AbstractController类。 It has a sub class Controller. 它有一个子类控制器。 In one of AbstractController's methods a new ApplicationLock is instantiated. 在AbstractController的一个方法中，实例化了一个新的ApplicationLock。 I'd like to mock ApplicationLock when writing ut for Controller. 我想在为Controller编写ut时模拟ApplicationLock。 I wrote a test case like below. 我写了一个如下的测试用例。
@test
public void testMethod(){
ApplicationLock mockLock=PowerMockito.mock(ApplicationLock.class);
PowerMockito.when(mockLock.tryObtain()).thenReturn(true);
PowerMockito.whenNew(ApplicationLock.class).withArguments(argThat(new IsFile()),anyString()).thenReturn(mockLock);
}
I've added necessary annotations to the test class. 我已经为测试类添加了必要的注释。
@RunWith(PowerMockRunner.class)
@PrepareForTest({AbstractController.class})
But I got the following error when running this test case. 但是在运行此测试用例时出现以下错误。 That is a static initializer in AbstractController. 这是AbstractController中的静态初始化程序。
Caused by: java.lang.NullPointerException at com.acompany.controller.common.AbstractController.(AbstractController.java:65) 引起：com.acompany.controller.common.AbstractController中的java.lang.NullPointerException。（AbstractController.java:65）
private static final String DEFAULT_FOLDER = AbstractController.class.getProtectionDomain().getCodeSource()
.getLocation().getPath();
Full stack trace is as below. 完整堆栈跟踪如下。
java.lang.ExceptionInInitializerError at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at javassist.runtime.Desc.getClassObject(Desc.java:44) at javassist.runtime.Desc.getClassType(Desc.java:153) at javassist.runtime.Desc.getType(Desc.java:123) at javassist.runtime.Desc.getType(Desc.java:79) at com.acompany.controller.portfolio.ControllerTest.testIncrementalFail(ControllerTest.java:195) 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 org.junit.internal.runners.TestMethod.invoke(TestMethod.java:66) at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:307) at org.junit.internal.runners.MethodRoadie$2.run(Me
1 个解决方案
解决方案1
3 2011-09-30 11:19:57
You could use then: 你可以使用：
@SuppressStaticInitializationFor({AbstractController.class})
And then, in your test case, set manually all static fields that need to be initialized, including the DEFAULT_FOLDER: 然后，在您的测试用例中，手动设置需要初始化的所有静态字段，包括DEFAULT_FOLDER：
Whitebox.setInternalState(Controller.class, "DEFAULT_FOLDER", "abcd");
Whitebox.setInternalState(Controller.class, "OTHER_FIELD", new Object());
The method Class<?>.getProtectionDomain() depends too much on class loader used, so you probably won't get it to work in JUnit/PowerMock, which use their own. 方法Class<?>.getProtectionDomain()过分依赖于使用的类加载器，所以你可能不会让它在使用它们自己的JUnit / PowerMock中工作。
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