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Possible bug in "org.jboss.ejb.client.EjbClientContext"
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created by <a href="https://community.jboss.org/people/sunil_dixit">Sunil Dixit</a> in <i>JBoss Remoting</i> - <a href="https://community.jboss.org/message/833533#833533">View the full discussion</a>
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<div class="jive-rendered-content"><p>jboss-ejb-client (<span style="text-decoration: underline;"><strong>Version 1.0.18.Final and above</strong></span>) has one bug (garbage collection related) in "<span style="font-size: 12pt;"><strong>public void unregisterEJBReceiver(final EJBReceiver receiver)</strong></span>" API.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This API uses "ExecutorService" to send close notification to registered listeners (if any) asynchronously. </p><p>Now if your InitialContext is eligible for garbage collection then it JVM calls RemoteContext.finalize() method which internally result into calling "<span style="font-size: 12pt;"><strong>org.jboss.ejb.client.EJBReceiverContext.close()</strong></span>" which triggers</p><p>"<span style="font-size: 12pt;"><strong>org.jboss.ejb.client.EJBClientContext.unregisterEJBReceiver()</strong></span>" .</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Before "<span style="font-size: 12pt;"><strong>org.jboss.ejb.client.EJBClientContext.unregisterEJBReceiver() " </strong></span>gets executed "<span style="font-size: 12pt;"><strong>org.jboss.ejb.client.EJBClientContext.<span style="color: #0000ff;">ejbClientContextTasksExecutorService</span></strong></span>" state is changed from RUNNING to TERMINATED i.e. ( runState is being set to 3) which result into "<span style="font-size: 12pt;">java.util.concurrent.RejectedExecutionException</span>". </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #333333;"><span style="font-size: 12pt;">T<strong>hreadPoolExecutor.addIfUnderMaximumPoolSize() API will always return false as " if (poolSize < maximumPoolSize && runState == RUNNING)" prevents to create new thread</strong></span>.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Finally caller APIs gets following exception</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>java.util.concurrent.RejectedExecutionException</p><p>        at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(Unknown Source)</p><p>        at java.util.concurrent.ThreadPoolExecutor.reject(Unknown Source)</p><p>        at java.util.concurrent.ThreadPoolExecutor.execute(Unknown Source)</p><p>        at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)</p><p>        at org.jboss.ejb.client.EJBClientContext.unregisterEJBReceiver(EJBClientContext.java:432)</p><p>        at org.jboss.ejb.client.EJBReceiverContext.close(EJBReceiverContext.java:59)</p><p>        at org.jboss.ejb.client.remoting.ChannelAssociation.notifyBrokenChannel(ChannelAssociation.java:404)</p><p>        at org.jboss.ejb.client.remoting.ChannelAssociation.access$100(ChannelAssociation.java:59)</p><p>        at org.jboss.ejb.client.remoting.ChannelAssociation$1.handleClose(ChannelAssociation.java:118)</p><p>        at org.jboss.ejb.client.remoting.ChannelAssociation$1.handleClose(ChannelAssociation.java:110)</p><p>        at org.jboss.remoting3.spi.SpiUtils.safeHandleClose(SpiUtils.java:54)</p><p>        at org.jboss.remoting3.spi.AbstractHandleableCloseable$CloseHandlerTask.run(AbstractHandleableCloseable.java:501)</p><p>        at org.jboss.remoting3.spi.AbstractHandleableCloseable.runCloseTask(AbstractHandleableCloseable.java:406)</p><p>        at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeComplete(AbstractHandleableCloseable.java:277)</p><p>        at org.jboss.remoting3.remote.RemoteConnectionChannel.closeAction(RemoteConnectionChannel.java:515)</p><p>        at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeAsync(AbstractHandleableCloseable.java:359)</p><p>        at org.jboss.remoting3.remote.RemoteConnectionHandler.closeAllChannels(RemoteConnectionHandler.java:390)</p><p>        at org.jboss.remoting3.remote.RemoteConnectionHandler.sendCloseRequest(RemoteConnectionHandler.java:231)</p><p>        at org.jboss.remoting3.remote.RemoteConnectionHandler.closeAction(RemoteConnectionHandler.java:376)</p><p>        at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeAsync(AbstractHandleableCloseable.java:359)</p><p>        at org.jboss.remoting3.ConnectionImpl.closeAction(ConnectionImpl.java:52)</p><p>        at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeAsync(AbstractHandleableCloseable.java:359)</p><p>        at org.jboss.naming.remote.client.HaRemoteNamingStore.closeAsync(HaRemoteNamingStore.java:385)</p><p>        at org.jboss.naming.remote.client.NamingStoreCache.release(NamingStoreCache.java:113)</p><p>        at org.jboss.naming.remote.client.NamingStoreCache$1.close(NamingStoreCache.java:98)</p><p>        at org.jboss.naming.remote.client.RemoteContext.finalize(RemoteContext.java:199)</p><p>        at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)</p><p>        at java.lang.ref.Finalizer.runFinalizer(Unknown Source)</p><p>        at java.lang.ref.Finalizer.access$100(Unknown Source)</p><p>        at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>          Below code in "org.jboss.ejb.client.EJBClientContext" is added into new versions and causing this problem</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>                // we *don't* want to send these notification to listeners synchronously since the listeners can be any arbitrary</p><p>                // application code and can potential block for a long time. So invoke the listeners asynchronously via our ExecutorService</p><p>                final Collection<EJBClientContextListener> listeners = new ArrayList<EJBClientContextListener>(this.ejbClientContextListeners);</p><p>                for (final EJBClientContextListener listener : listeners) {</p><p>                    this.ejbClientContextTasksExecutorService.submit(new Runnable() {</p><p>                        @Override</p><p>                        public void run() {</p><p>                            try {</p><p>                                listener.receiverUnRegistered(receiverContext);</p><p>                            } catch (Throwable t) {</p><p>                                // log and ignore</p><p>                                logger.debug("Exception trying to invoke EJBClientContextListener " + listener + " for EJB client context " + EJBClientContext.this + " on un-registertation of EJBReceiver " + receiver, t);</p><p>                            }</p><p>                        }</p><p>                    });</p><p>                }</p><p>            }</p></div>
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