如何修复java.lang.IllegalStateException：无法清除JavaAgentClassRegister。尚未调用Set方法。？

Question

我正在使用JunitRunner来运行使用PowerMock和Mockito编写的单元测试。

使用的Spring Boot版本是

<version>2.0.5.RELEASE</version>

pom.xml具有以下依赖性

     <dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-mockito2</artifactId>
<version>2.0.0-beta.5</version>
<scope>test</scope>

</dependency>

<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>2.0.0-beta.5</version>
<scope>test</scope>

<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4-rule-agent</artifactId>
<version>2.0.0-beta.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-javaagent</artifactId>
<version>2.0.0-beta.5</version>
</dependency>

测试类具有如下所示的注释

@RunWith(JUnit4.class)
@PrepareForTest({SomeXService.class})

运行测试用例时，出现如下所示的错误

java.lang.IllegalStateException：无法清除JavaAgentClassRegister。尚未调用Set方法。在org.powermock.api.extension.agent.JavaAgentFrameworkRegisterImpl.clear（JavaAgentFrameworkRegisterImpl.java:41）在org.powermock.modules.junit4.rule.PowerMockStatement.clearFrameworkAgentClassRegister（PowerMockRule.java:84）在org.powermock.modules.junit4.rule.PowerMockStatement.evaluate（PowerMockRule.java:78）在org.junit.runners.ParentRunner.runLeaf（ParentRunner.java:325）在org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:78）在org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:57）在org.junit.runners.ParentRunner $ 3.run（ParentRunner.java:290）在org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）在org.junit.runners.ParentRunner.runChildren（ParentRunner.java:288）在org.junit.runners.ParentRunner.access $ 000（ParentRunner.java:58）在org.junit.runners.ParentRunner上$ 2.evaluate（ParentRunner.java:268）在org.junit.runners.ParentRunner.run（ParentRunner.java:363）在org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:89）在org.eclipse.jdt.internal.junit.runner.TestExecution.run（TestExecution.java:41）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:541）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:763）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run（RemoteTestRunner.java:463）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:209）

可能是什么原因？如何进行这项工作？

Answer 1

在JDK 8和PowerMock 2.0.2上运行测试时，我遇到了同样的问题，并得到了以下异常链。只有在我尝试了JDK 9和11的JDK 8上才发生，它们工作得很好。显然，它与ByteBuddy代理有关。

Could not initialize plugin: interface org.mockito.plugins.MockMaker (alternate: null)
    Failed to load interface org.mockito.plugins.MockMaker implementation declared in sun.misc.CompoundEnumeration@ff7da2b
        Failed to load MockMaker implementation: mock-maker-inline
            Internal problem occurred, please report it. Mockito is unable to load the default implementation of class that is a part of Mockito distribution. Failed to load interface org.mockito.plugins.MockMaker

                Could not initialize inline Byte Buddy mock maker. (This mock maker is not supported on Android.)

                Java               : 1.8
                JVM vendor name    : Oracle Corporation
                JVM vendor version : 25.171-b11
                JVM name           : Java HotSpot(TM) 64-Bit Server VM
                JVM version        : 1.8.0_171-b11
                JVM info           : mixed mode
                OS name            : Mac OS X
                OS version         : 10.15.2
                    Error during attachment using: net.bytebuddy.agent.ByteBuddyAgent$AttachmentProvider$Compound@c746e76

您看不到上述异常的原因是PowerMock规则的finally块引发了一个异常，该异常掩盖了我上面显示的异常。

 @Override
    public void evaluate() throws Throwable {
        Object annotationEnabler = loadAnnotationEnableIfPresent();
        try {
            injectMocksUsingAnnotationEnabler(target, annotationEnabler); //This line throws the exception I've shown above
            setFrameworkAgentClassRegister();
            fNext.evaluate();
        } finally {
            MockRepository.clear();
            clearMockFields(target, annotationEnabler);
            clearFrameworkAgentClassRegister();// This line throws another exception masking the first one
        }
    }

要查看上述例外情况，您需要远程调试运行测试的过程。在Maven中，您可以使用-Dmaven.surefire.debug选项。