Druid register mbean error
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在使用数据库连接池时(本文通用于其他使用jmx mbean的应用),运行几天后出现如下错误
2014/11/18 10:31:00,617 [ERROR] [localhost-startStop-6] [com.alibaba.druid.stat.DruidDataSourceStatManager.addDataSource(DruidDataSourceStatManager.java:154)] register mbean errorjavax.management.InstanceAlreadyExistsException: com.alibaba.druid:type=DruidDataSource,id=Druid MySQL DB pool at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312) at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482) at com.alibaba.druid.stat.DruidDataSourceStatManager.addDataSource(DruidDataSourceStatManager.java:152) at com.alibaba.druid.pool.DruidDataSource$1.run(DruidDataSource.java:1298) at java.security.AccessController.doPrivileged(Native Method) at com.alibaba.druid.pool.DruidDataSource.registerMbean(DruidDataSource.java:1294) at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:623) at com.longdai.data.ConnectionManagerDruid.<init>(ConnectionManagerDruid.java:68) at com.longdai.data.ConnectionManager.getInstance(ConnectionManager.java:86) at com.longdai.data.dao.Database.<clinit>(Database.java:22) at com.longdai.service.admin.CloseNetWorkService.getNetWorkById(CloseNetWorkService.java:87) at com.longdai.service.admin.CloseNetWorkService$$FastClassByCGLIB$$bbdb465c.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149) at com.gozap.services.ServiceMethodInterceptor.invoke(ServiceMethodInterceptor.java:31) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:635) at com.longdai.service.admin.CloseNetWorkService$$EnhancerByCGLIB$$19cbebaf.getNetWorkById(<generated>) at com.longdai.system.listener.CloseNetWorkConfigiListener.contextInitialized(CloseNetWorkConfigiListener.java:37) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:618) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:963) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1600) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)查看源码,一直跟踪到
at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484) // 这里 at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312) //这里入口
一路跟踪源码,传入的参数一直是name属性,查看上层 DruidDataSourceStatManager.java addDataSource(Object dataSource, String name)
在看上层: DruidDataSource.java line:1298
这里传入了数据源的name属性,经过上面的分析,是利用DataSource的name属性拼接成一个id,然后用次id注册mbean, 然而,druid的name属性写成了一个默认值
故此注册失败。
现在知道了原因,为什么运行几天后才出现这个错误,并且运维说有回滚到了上个版本,在部署(直接重新部署,并没有重启tomcat/jvm)的时候就直接报这个错误,经过上面的推断是jvm中已经有一个此id的mbean了,故此即使重新部署还是失败,我给想了个办法,重启tomcat,搞定,果然奏效。
在来看看druid的wiki中,虽然提示了配置name属性,但是在配置文件中配置后是不起作用的,经过查看源码发现并没有加载次属性,所以配置了没用,后来我在代码中获取配置文件的name属性,然后dataSource.setName(name),虽然名字设置成功了,在druid的监控页面也可以看的自定义的名字,但是不幸的是druid运行几天出错了或者重新部署,然后重新向jvm注册mbean,导致了出错。
再来看看datasource的name的默认值是怎么设置的DruidAbstractDataSource.java line: 849
可以看到在getName属性中是DataSource-加上计算的一个hash值,但是此方法只在getName时返回,而在注册mbean时druid的name默认是null, 在注册mbean时分析下面的代码DruidDataSourceStatManager.java line: 161
代码显示是根据dataSource计算出来莪一个hash值,然后进行注册mbean。
经过上面的分析在注册mbean时,一定要保证registerMBean的name参数唯一,还要在上层拦截异常
InstanceAlreadyExistsException,然后自动处理异常
总结:在使用Druid的时候,不要使用name属性,druid官网并没有给出说明,本文在此给大家一个解释和处理方法。另外1.0.5版本配置后是不起作用的,需要自己强行setName。如自己配置了name,为防止出错,最好修改Druid源码 DruidDataSourceStatManager.java addDataSource(Object dataSource, String name) ,在生成objectName是在加一个 hash(参考161)。另外大家在注册MBean时,一定要保证id的唯一,以及重复的处理方式。如果出现了这个错误,就将与本项目使用的同一个jvm的项目都关掉,清理掉本jvm,然后重启服务
附: https://github.com/alibaba/druid
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