一個Tomcat下部署多個項目異常：org.springframework.jmx.export.UnableToRegisterMBeanException: Unable to register MBean 的解決方法

內容簡介

在測試服務器上Tomcat下部署兩個Spring boot項目，總是一個能啟動成功，另一個啟動不成功。這兩個war包單獨部署均能正常啟動。

查看日志：啟動時報出 org.springframework.jmx.export.UnableToRegisterMBeanException: Unable to register MBean 的異常。

本文主要說明這個問題的解決方法（我的情況用下面的方法能解決）。

異常信息（部分）

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
ERROR 10-28 11:43:21(SpringApplication.java:845): Application run failed
org.springframework.jmx.export.UnableToRegisterMBeanException: Unable to register MBean [org.springframework.cloud.context.environment.EnvironmentManager@6ae2c860] with key 'environmentManager'; nested exception is javax.management.InstanceAlreadyExistsException: org.springframework.cloud.context.environment:name=environmentManager,type=EnvironmentManager
        at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:625)
        at org.springframework.jmx.export.MBeanExporter.lambda$registerBeans$2(MBeanExporter.java:551)
        at org.springframework.jmx.export.MBeanExporter$$Lambda$1330/227855367.accept(Unknown Source)
        at java.util.HashMap.forEach(HashMap.java:1280)
        at org.springframework.jmx.export.MBeanExporter.registerBeans(MBeanExporter.java:551)
        at org.springframework.jmx.export.MBeanExporter.afterSingletonsInstantiated(MBeanExporter.java:434)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:776)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:398)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:157)
        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:137)
        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:91)
        at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:172)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5156)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
        at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1101)
        at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1786)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: javax.management.InstanceAlreadyExistsException: org.springframework.cloud.context.environment: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:137)
        at org.springframework.jmx.export.MBeanExporter.registerBeanInstance(MBeanExporter.java:679)
        at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:615)
        ... 28 more

解決方法

在兩個項目的application.properties文件中，添加下面的定義：

spring.jmx.default-domain=xxx

注意，兩個項目的xxx不能是一樣的，如下圖：

詳細的解釋可參考下面的文章：

https://blog.csdn.net/slx3320612540/article/details/87910372