Server monitoring module throws "java.lang.NullPointerException" in the log.

[glassfishrobot]

Reproduce Scenario:

1. From admin console --> common tasks --> choose server (Admin Server) node.
2. From right pan --> choose Monitor.
3. Choose any other child buttons as (Application, Server, or resources).

4. Check server.log and you will see the following errors:

   [2013-04-13T03:00:11.945+0200] [glassfish 4.0] [INFO] [NCLS-REST-00003] [javax.enterprise.admin.rest] 
   [tid: _ThreadID=34 _ThreadName=admin-listener(1)] [timeMillis: 1365814811945] [levelValue: 800] 
   [[
     An error occurred while processing the request. Please see the server logs for details.
   java.lang.NullPointerException
       at org.glassfish.admin.rest.resources.MonitoringResource.getChildNodes(MonitoringResource.java:131)
       at sun.reflect.GeneratedMethodAccessor327.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke(Method.java:601)
       at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
       at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:125)
       at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:152)
       at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:91)
       at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:346)
       at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:341)
       at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)
       at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:217)
       at org.glassfish.jersey.internal.Errors$1.call(Errors.java:231)
       at org.glassfish.jersey.internal.Errors$1.call(Errors.java:227)
       at org.glassfish.jersey.internal.Errors.process(Errors.java:275)
       at org.glassfish.jersey.internal.Errors.process(Errors.java:257)
       at org.glassfish.jersey.internal.Errors.process(Errors.java:227)
       at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
       at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:191)
       at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:819)
       at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:325)
       at org.glassfish.admin.rest.adapter.RestAdapter$2.service(RestAdapter.java:318)
       at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:181)
       at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
       at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
       at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
       at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
       at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
       at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
       at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
       at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
       at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
       at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
       at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
       at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
       at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
       at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
       at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
       at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
       at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
       at java.lang.Thread.run(Thread.java:722)
   ]]
   
   [2013-04-13T03:00:11.967+0200] [glassfish 4.0] [INFO] [NCLS-REST-00003] [javax.enterprise.admin.rest] 
   [tid: _ThreadID=37 _ThreadName=admin-listener(4)] [timeMillis: 1365814811967] [levelValue: 800] 
   [[
     An error occurred while processing the request. Please see the server logs for details.
   java.lang.NullPointerException
       at org.glassfish.admin.rest.resources.MonitoringResource.getChildNodes(MonitoringResource.java:131)
       at sun.reflect.GeneratedMethodAccessor327.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke(Method.java:601)
       at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
       at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:125)
       at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:152)
       at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:91)
       at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:346)
       at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:341)
       at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)
       at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:217)
       at org.glassfish.jersey.internal.Errors$1.call(Errors.java:231)
       at org.glassfish.jersey.internal.Errors$1.call(Errors.java:227)
       at org.glassfish.jersey.internal.Errors.process(Errors.java:275)
       at org.glassfish.jersey.internal.Errors.process(Errors.java:257)
       at org.glassfish.jersey.internal.Errors.process(Errors.java:227)
       at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
       at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:191)
       at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:819)
       at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:325)
       at org.glassfish.admin.rest.adapter.RestAdapter$2.service(RestAdapter.java:318)
       at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:181)
       at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
       at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
       at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
       at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
       at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
       at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
       at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
       at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
       at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
       at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
       at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
       at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
       at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
       at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
       at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
       at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
       at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
       at java.lang.Thread.run(Thread.java:722)
   ]]
   ..................

   Environment

   Windows 7 SP1 x64 bit Mac OS X 10.8.3 Glassfish v4_b84

   Affected Versions

   [4.0_dev]

[glassfishrobot]

• Issue Imported From: https://github.com/javaee/glassfish/issues/20306
• Original Issue Raised By:@glassfishrobot
• Original Issue Assigned To: @yaminikb
• Original Issue Closed By:@glassfishrobot

[glassfishrobot]

@glassfishrobot Commented tmueller said:

• What is the impact on the customer of the bug?

How likely is it that a customer will see the bug and how serious is the bug? Is it a regression? Does it meet other bug fix criteria (security, performance, etc.)? What CTS failures are caused by this bug?

This is a regression caused by a previous performance fix to the MonitoringBootstrap service.

• What is the cost/risk of fixing the bug?

How risky is the fix? How much work is the fix? Is the fix complicated?

Low cost, low risk. Just adding a null check in one place.

• Is there an impact on documentation or message strings? No

• Which tests should QA (re)run to verify the fix did not destabilize GlassFish? Tests that access the monitoring feature of the console.

• Which is the targeted build of 4.0 for this fix? b85.

• If this an integration of a new version of a component from another project, what are the changes that are being brought in? This might be list of Jira issues from that project or a list of revision messages. N/A

[glassfishrobot]

@glassfishrobot Commented tmueller said: Approved for 4.0.

[glassfishrobot]

@glassfishrobot Commented tmueller said: Fixed in revision 61421.

[glassfishrobot]

@glassfishrobot Commented Was assigned to tmueller

[glassfishrobot]

@glassfishrobot Commented This issue was imported from java.net JIRA GLASSFISH-20306

[glassfishrobot]

@glassfishrobot Commented Reported by taman

[glassfishrobot]

@glassfishrobot Commented Marked as fixed on Sunday, April 14th 2013, 12:14:11 pm