Today ERP system of my client initially got connectornull error and finally came to java heap space error. Sometimes the connectornull error occurs but is not followed by java heap space error. Below are the application log I captured when this problem occurred. Please advise the root cause of this problem and what is the solution. 2011-07-21 06:56:44.915 ERROR Connectornull at org.eclipse.jetty.http.HttpGenerator.flushBuffer(HttpGenerator.java:885) at org.eclipse.jetty.http.AbstractGenerator.flush(AbstractGenerator.java:421) at org.eclipse.jetty.server.HttpOutput.flush(HttpOutput.java:78) at org.eclipse.jetty.server.HttpConnection$Output.flush(HttpConnection.java:1081) at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:157) at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:86) at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1026) at org.apache.commons.io.IOUtils.copy(IOUtils.java:999) at lu.processRequest(SourceFile:37) at fr.a(SourceFile:64) at com.mendix.core.MxRuntime.processRequest(SourceFile:889) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:39) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113) at org.eclipse.jetty.server.Server.handle(Server.java:334) at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559) at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:992) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:541) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:203) at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:406) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:462) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436) at java.lang.Thread.run(Unknown Source) Caused by: An existing connection was forcibly closed by the remote host at sun.nio.ch.SocketDispatcher.write0(Native Method) at sun.nio.ch.SocketDispatcher.write(Unknown Source) at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source) at sun.nio.ch.IOUtil.write(Unknown Source) at sun.nio.ch.SocketChannelImpl.write(Unknown Source) at org.eclipse.jetty.io.nio.ChannelEndPoint.flush(ChannelEndPoint.java:165) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.flush(SelectChannelEndPoint.java:239) at org.eclipse.jetty.http.HttpGenerator.flushBuffer(HttpGenerator.java:829) at org.eclipse.jetty.http.AbstractGenerator.flush(AbstractGenerator.java:421) at org.eclipse.jetty.server.HttpOutput.flush(HttpOutput.java:78) at org.eclipse.jetty.server.HttpConnection$Output.flush(HttpConnection.java:1081) at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:157) at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:86) at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1026) at org.apache.commons.io.IOUtils.copy(IOUtils.java:999) at lu.processRequest(SourceFile:37) at fr.a(SourceFile:64) at com.mendix.core.MxRuntime.processRequest(SourceFile:889) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:39) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113) at org.eclipse.jetty.server.Server.handle(Server.java:334) at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559) at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:992) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:541) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:203) at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:406) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:462) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436) at java.lang.Thread.run(Unknown Source)