我们有一个 gradle Jersey 项目，我们正在尝试使用 PowerMock 和 EasyMock（和 JUnit）进行单元测试，因为我们有几个需要模拟的静态方法。我们终于让 PowerMock 与 Jersey 一起工作（参见这个问题），但 PowerMock 只允许我们的 REST 调用返回字符串。所有其他返回类型（例如 Lists）都会导致InternalServerErrorException. 完整的堆栈跟踪：
javax.ws.rs.InternalServerErrorException: HTTP 500 Internal Server Error
at org.glassfish.jersey.client.JerseyInvocation.convertToException(JerseyInvocation.java:1020)
at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:877)
at org.glassfish.jersey.client.JerseyInvocation.access$800(JerseyInvocation.java:92)
at org.glassfish.jersey.client.JerseyInvocation$3.call(JerseyInvocation.java:722)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:444)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:718)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:430)
at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:321)
at com.company.project.sm.rest.PowerMockTest.aListTest(PowerMockTest.java:104)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:326)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:89)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:97)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:310)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:131)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$TestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:147)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.evaluateStatement(PowerMockJUnit47RunnerDelegateImpl.java:107)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:298)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:218)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:160)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:134)
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:136)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:57)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
单元测试中的 REST 调用在没有 PowerMock 的情况下工作；使用 PowerMock 运行时它们会失败。我们无法发现我们做错了什么。
以下是我们的单元测试示例（整个类）：
// comment-out these two lines to turn off PowerMock
@org.powermock.core.classloader.annotations.PowerMockIgnore({"javax.ws.*", "org.glassfish.*"})
@RunWith(PowerMockRunner.class)
public class PowerMockTest {
private JerseyTest jerseyTest;
@Before
public void setUp() throws Exception {
this.jerseyTest = new JerseyTest() {
@Override
protected Application configure() {
return PowerMockTest.this.configure();
}
};
this.jerseyTest.setUp();
}
@After
public void tearDown() throws Exception {
this.jerseyTest.tearDown();
}
public ResourceConfig configure() {
return new ResourceConfig(PowerMockTestResource.class);
}
@Test
public void thisTestWorks() {
String fooString = this.jerseyTest.target("test/string")
.request(MediaType.TEXT_PLAIN)
.get( String.class );
assertNotNull( fooString );
}
@Test
public void thisTestFails() {
List<PowerMockStringWrapper> response = this.jerseyTest.target("test/list")
.request( MediaType.APPLICATION_JSON )
.get( new GenericType<List<PowerMockStringWrapper>>() {} );
assertNotNull( response );
}
}
.get行中的thisTestFails()行是堆栈跟踪报告失败的行。
如您所见，我们在测试中甚至没有做任何 PowerMock-ey 操作。这PowerMockStringWrapper只是一个包装 String 的小类，因为 Jersey（出于某种原因）不能返回基本字符串的列表。再一次，这两个单元测试都可以在没有 PowerMock 的情况下工作，但是一旦我们打开 PowerMock，第二个单元测试就会失败。
任何人都可以提出任何建议吗？