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java.io.IOException: Connection is closed	at org.glassfish.grizzly.nio.NIOConnection.assertOpen(NIOConnection.java:432)	at org.glassfish.grizzly.http.io.OutputBuffer.write(OutputBuffer.java:471)	at org.glassfish.grizzly.http.io.OutputBuffer.write(OutputBuffer.java:465)	at org.glassfish.grizzly.http.server.NIOWriterImpl.write(NIOWriterImpl.java:89)	at org.glassfish.grizzly.http.server.util.HtmlHelper.sendErrorPage(HtmlHelper.java:101)	at org.glassfish.grizzly.http.server.Response.sendError(Response.java:1358)	at org.glassfish.grizzly.http.server.Response.sendError(Response.java:1313)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:175)	at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)	at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)	at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)	at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)	at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)	at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)	at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)	at java.lang.Thread.run(Thread.java:745)