無法註冊MBean

Question

我正在爲spring-boot應用程序編寫集成測試，我正在使用常用方法和所有其他常見工具的基本測試類。這樣的事情：

@ActiveProfiles("test") 
@RunWith(SpringRunner.class) 
@SpringBootTest(webEnvironment = ...) 
@Sql(scripts = { "script1.sql", ... }, ...) 
public abstract class ITBase { 
... 

我有一個文件生成器，它是自動裝配到一個服務，它是自動裝配到控制器。 我正在使用RestTemplate測試控制器。 我想嘲笑文件生成器，只返回一個隨機字符串。

因爲它是一個Spring bean，我明白我應該以這種方式使用@MockBean標註在我的測試：

public class ControllerIT extends ITBase { 

@MockBean 
private FileGenerator fileGenerator; 

@Test 
@Transactional 
public void testSomeTest() { 
... 

我的問題是：

如果我運行給定的測試類，所有測試都通過了。但是，如果我運行所有測試類，則會收到UnableToRegisterMBeanException。 堆棧跟蹤看起來是這樣的：

java.lang.IllegalStateException: Failed to load ApplicationContext 

at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) 
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) 
at org.springframework.boot.test.autoconfigure.AutoConfigureReportTestExecutionListener.prepareTestInstance(AutoConfigureReportTestExecutionListener.java:49) 
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230) 
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228) 
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287) 
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289) 
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247) 
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191) 
at org.junit.runners.Suite.runChild(Suite.java:128) 
at org.junit.runners.Suite.runChild(Suite.java:27) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
at org.junit.runner.JUnitCore.run(JUnitCore.java:137) 
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) 
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51) 
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) 
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) 
Caused by: org.springframework.jmx.export.UnableToRegisterMBeanException: Unable to register MBean [org.springframework.cloud.context.environment.EnvironmentManager@607624b7] with key 'environmentManager'; nested exception is javax.management.InstanceAlreadyExistsException: com.gd.configurationrepository:name=environmentManager,type=EnvironmentManager 
at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:625) 
at org.springframework.jmx.export.MBeanExporter.registerBeans(MBeanExporter.java:550) 
at org.springframework.jmx.export.MBeanExporter.afterSingletonsInstantiated(MBeanExporter.java:432) 
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:796) 
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) 
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) 
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) 
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) 
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:369) 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:313) 
at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:111) 
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) 
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) 
... 31 more 
Caused by: javax.management.InstanceAlreadyExistsException: com.gd.configurationrepository:name=environmentManager,type=EnvironmentManager 
at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437) 
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898) 
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966) 
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900) 
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324) 
at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522) 
at org.springframework.jmx.support.MBeanRegistrationSupport.doRegister(MBeanRegistrationSupport.java:195) 
at org.springframework.jmx.export.MBeanExporter.registerBeanInstance(MBeanExporter.java:678) 
at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:615) 
... 43 more 

*我沒有阿光或任何責任。只需一個簡單的文件生成器，服務和控制器。

Answer 1

您的根本原因是您試圖重新實例化MBean。確保你爲整組測試實例化一次，而不是每次測試一次（可能將@MockBean移動到ITBase並從所有子類中刪除）。錯誤信息是

javax.management.InstanceAlreadyExistsException: com.gd.configurationrepository:name=environmentManager,type=EnvironmentManager at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)