>我使用 @EmbeddedKafka 进行了多次集成测试，在迁移到较新的 springboot 版本 2.1.8.RELEASE 后，日志会填充这些堆栈跟踪。知道是什么原因造成的吗？
javax.management.InstanceAlreadyExistsException: kafka.server:type=app-info,id=0
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.apache.kafka.common.utils.AppInfoParser.registerAppInfo(AppInfoParser.java:62)
at kafka.server.KafkaServer.startup(KafkaServer.scala:321)
at kafka.utils.TestUtils$.createServer(TestUtils.scala:132)
at kafka.utils.TestUtils.createServer(TestUtils.scala)
at org.springframework.kafka.test.EmbeddedKafkaBroker.afterPropertiesSet(EmbeddedKafkaBroker.java:223)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1837)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:405)
如果你的测试使用的是 Spring 测试上下文(@RunWith(SpringRunner.class), @SpringJUnitConfig, @SpringBootTest等(，那么嵌入式 kafka 存储在应用程序上下文中。
向每个测试类添加@DirtiesContext，以便正确释放实例。