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java.lang.IllegalStateException: Request already released from 
 asynchronous mode	at org.vaadin.artur.icepush.ICEPushServlet.service(ICEPushServlet.java:68)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)	at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)	at com.sun.grizzly.comet.CometEngine.executeServlet(CometEngine.java:444)	at com.sun.grizzly.comet.CometEngine.handle(CometEngine.java:308)	at com.sun.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:87)	at com.sun.grizzly.arp.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:171)	at com.sun.grizzly.arp.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:143)	at com.sun.grizzly.arp.AsyncProcessorTask.doTask(AsyncProcessorTask.java:102)	at com.sun.grizzly.http.TaskBase.run(TaskBase.java:193)	at com.sun.grizzly.http.TaskBase.execute(TaskBase.java:175)	at com.sun.grizzly.arp.DefaultAsyncHandler.handle(DefaultAsyncHandler.java:145)	at com.sun.grizzly.arp.AsyncProtocolFilter.execute(AsyncProtocolFilter.java:210)	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)	at com.sun.grizzly.ContextTask.run(ContextTask.java:71)	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)	at java.lang.Thread.run(Thread.java:662)