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POJava Thread lags/long sleeps on Ubuntu/Jetty
 

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    <p>I am running Java web server on Jetty 6 on Ubunu,for reverse-ajax based web. And I have serious problems with lagging threads which resend data to browsers. Very often some thread just start to sleep for long time. Like 1 sec and more, sometimes even hours. I thought first that it is bug of ajax library (DWR), than that it is Jetty problem, than that it is Java bug, but all suspicions are probably wrong. I lost weeks trying to solve this issue. I am completly lost. The only think I didn't try is to run it on another OS, like windows. Here is the stacktrace of the thread which usually lags:</p> <pre><code>Cancelled at this stacktrace: at java.lang.Object.wait(Native Method) at org.mortbay.io.nio.SelectChannelEndPoint.blockWritable(SelectChannelEndPoint.java:279) at org.mortbay.jetty.AbstractGenerator$Output.blockForOutput(AbstractGenerator.java:544) at org.mortbay.jetty.AbstractGenerator$Output.flush(AbstractGenerator.java:571) at org.mortbay.jetty.HttpConnection$Output.flush(HttpConnection.java:997) at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:648) at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:579) at java.io.ByteArrayOutputStream.writeTo(ByteArrayOutputStream.java:109) at org.mortbay.jetty.AbstractGenerator$OutputWriter.write(AbstractGenerator.java:903) at org.mortbay.jetty.AbstractGenerator$OutputWriter.write(AbstractGenerator.java:752) at org.mortbay.jetty.AbstractGenerator$OutputWriter.write(AbstractGenerator.java:741) at java.io.PrintWriter.write(PrintWriter.java:412) at java.io.PrintWriter.write(PrintWriter.java:429) at java.io.PrintWriter.print(PrintWriter.java:559) at java.io.PrintWriter.println(PrintWriter.java:695) at org.directwebremoting.dwrp.PlainScriptConduit.addScript(PlainScriptConduit.java:93) at org.directwebremoting.impl.DefaultScriptSession.addScript(DefaultScriptSession.java:239) at server.comunication.dwr.OneReverseDWRServer.sendLocalBuffer(OneReverseDWRServer.java:385) at server.comunication.dwr.OneReverseDWRServer.sendMessageLocal(OneReverseDWRServer.java:363) at server.comunication.dwr.OneReverseDWRServer.sendMessage(OneReverseDWRServer.java:412) at server.comunication.messaging.SendTask.call(SendTask.java:53) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) </code></pre> <p>When I tried different jetty connection Selector, stack trace was different but it was waiting on some similar place. I tried many versions of combinations of Jetty and Java. I thought it might be NIO bug, but when I changed selector to non-nio, it was stacked on other place.</p> <p>Can be problem on Linux? I am running it as root. Are there some setting in ubuntu which I can change to force waiting threads to weak up as they should? Pls. help, I am completely lost here.</p> <p>thanks </p>
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