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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839)	at java.util.HashMap$KeyIterator.next(HashMap.java:874)	at java.util.AbstractCollection.toArray(AbstractCollection.java:195)	at org.icepush.LocalPushGroupManager.getPendingNotifications(LocalPushGroupManager.java:133)	at org.icepush.BlockingConnectionServer$RunningServer.service(BlockingConnectionServer.java:338)	at org.icepush.BlockingConnectionServer.service(BlockingConnectionServer.java:96)	at org.icepush.SequenceTaggingServer.service(SequenceTaggingServer.java:54)	at org.icepush.PushStormDetectionServer.service(PushStormDetectionServer.java:52)	at org.icepush.servlet.AsyncAdaptingServlet.service(AsyncAdaptingServlet.java:68)	at org.icepush.servlet.EnvironmentAdaptingServlet.service(EnvironmentAdaptingServlet.java:56)	at org.icepush.servlet.PathDispatcher.service(PathDispatcher.java:39)	at org.icepush.servlet.BrowserDispatcher$BrowserEntry.service(BrowserDispatcher.java:101)	at org.icepush.servlet.BrowserDispatcher.service(BrowserDispatcher.java:45)	at org.icepush.servlet.ConfigurationServlet.service(ConfigurationServlet.java:101)	at org.icepush.servlet.PathDispatcher.service(PathDispatcher.java:39)	at org.icepush.servlet.MainServlet.service(MainServlet.java:131)	at org.icefaces.impl.push.servlet.ICEpushResourceHandler$ICEpushResourceHandlerImpl.handleResourceRequest(ICEpushResourceHandler.java:235)	at org.icefaces.impl.push.servlet.ICEpushResourceHandler.handleResourceRequest(ICEpushResourceHandler.java:128)	at org.icefaces.impl.application.SessionTimeoutMonitor.handleSessionAwareResourceRequest(SessionTimeoutMonitor.java:63)	at org.icefaces.impl.application.SessionAwareResourceHandlerWrapper.handleResourceRequest(SessionAwareResourceHandlerWrapper.java:40)	at javax.faces.application.ResourceHandlerWrapper.handleResourceRequest(ResourceHandlerWrapper.java:125)	at javax.faces.application.ResourceHandlerWrapper.handleResourceRequest(ResourceHandlerWrapper.java:125)	at javax.faces.application.ResourceHandlerWrapper.handleResourceRequest(ResourceHandlerWrapper.java:125)	at javax.faces.application.ResourceHandlerWrapper.handleResourceRequest(ResourceHandlerWrapper.java:125)	at org.icefaces.impl.application.AuxUploadResourceHandler.handleResourceRequest(AuxUploadResourceHandler.java:82)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:591)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:744)