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From "Hiranya Jayathilaka (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (SYNAPSE-659) MBeanRegistrar Is Not Thread Safe
Date Wed, 09 Jun 2010 09:22:26 GMT

     [ https://issues.apache.org/jira/browse/SYNAPSE-659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hiranya Jayathilaka resolved SYNAPSE-659.
-----------------------------------------

    Resolution: Fixed

Fixed on the trunk

> MBeanRegistrar Is Not Thread Safe
> ---------------------------------
>
>                 Key: SYNAPSE-659
>                 URL: https://issues.apache.org/jira/browse/SYNAPSE-659
>             Project: Synapse
>          Issue Type: Bug
>    Affects Versions: 1.2
>            Reporter: Hiranya Jayathilaka
>            Assignee: Hiranya Jayathilaka
>             Fix For: 2.0
>
>
> The MBeanRegistrar implementation used to register various MBeans, is not thread safe.
The register method can be invoked by multiple threads at the same time with the same arguments.With
a sufficient level of contention, the registrar may attempt to register the same MBean multiple
times. This results in an exception like this:
> [2010-06-09 11:28:56,840]  WARN - MBeanRegistrar Error registering a MBean with name
' StatisticsView ' and category name ' StatisticsView' for JMX management
> javax.management.InstanceAlreadyExistsException: org.apache.synapse:Type=StatisticsView,Name=StatisticsView
> 	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 org.apache.synapse.commons.jmx.MBeanRegistrar.registerMBean(MBeanRegistrar.java:51)
> 	at org.apache.synapse.aspects.statistics.StatisticsCollector.<init>(StatisticsCollector.java:36)
> 	at org.apache.synapse.aspects.statistics.StatisticsReporter.collectStatistics(StatisticsReporter.java:192)
> 	at org.apache.synapse.aspects.statistics.StatisticsReporter.reportForComponent(StatisticsReporter.java:56)
> 	at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:75)
> 	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:178)
> 	at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:167)
> 	at org.apache.synapse.transport.nhttp.ServerWorker.processEntityEnclosingMethod(ServerWorker.java:349)
> 	at org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:239)
> 	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:58)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:619)
> [2010-06-09 11:28:56,840]  WARN - MBeanRegistrar Error registering a MBean with name
' StatisticsView ' and category name ' StatisticsView' for JMX management
> javax.management.InstanceAlreadyExistsException: org.apache.synapse:Type=StatisticsView,Name=StatisticsView
> 	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 org.apache.synapse.commons.jmx.MBeanRegistrar.registerMBean(MBeanRegistrar.java:51)
> 	at org.apache.synapse.aspects.statistics.StatisticsCollector.<init>(StatisticsCollector.java:36)
> 	at org.apache.synapse.aspects.statistics.StatisticsReporter.collectStatistics(StatisticsReporter.java:192)
> 	at org.apache.synapse.aspects.statistics.StatisticsReporter.reportForComponent(StatisticsReporter.java:56)
> 	at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:75)
> 	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:178)
> 	at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:167)
> 	at org.apache.synapse.transport.nhttp.ServerWorker.processEntityEnclosingMethod(ServerWorker.java:349)
> 	at org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:239)
> 	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:58)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:619)
> [2010-06-09 11:28:56,840]  WARN - MBeanRegistrar Error registering a MBean with name
' StatisticsView ' and category name ' StatisticsView' for JMX management
> javax.management.InstanceAlreadyExistsException: org.apache.synapse:Type=StatisticsView,Name=StatisticsView
> 	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 org.apache.synapse.commons.jmx.MBeanRegistrar.registerMBean(MBeanRegistrar.java:51)
> 	at org.apache.synapse.aspects.statistics.StatisticsCollector.<init>(StatisticsCollector.java:36)
> 	at org.apache.synapse.aspects.statistics.StatisticsReporter.collectStatistics(StatisticsReporter.java:192)
> 	at org.apache.synapse.aspects.statistics.StatisticsReporter.reportForComponent(StatisticsReporter.java:56)
> 	at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:75)
> 	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:178)
> 	at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:167)
> 	at org.apache.synapse.transport.nhttp.ServerWorker.processEntityEnclosingMethod(ServerWorker.java:349)
> 	at org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:239)
> 	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:58)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:619)
> [2010-06-09 11:28:56,840]  WARN - MBeanRegistrar Error registering a MBean with name
' StatisticsView ' and category name ' StatisticsView' for JMX management
> In this case I engaged statistics on an endpoint and then loaded the ESB with Java bench
using 30 concurrent threads.

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