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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