0 Replies Latest reply on Aug 22, 2011 4:14 AM by Francis Drake

    Many threads blocked

    Francis Drake Newbie

      hi,


         under a big load, I have a lot of there in my threads dump:


      - waiting on <0x4b7a3e33> (a java.util.Collections$SynchronizedMap)
      java.util.Collections$SynchronizedMap.keySet(Collections.java:1996)
      org.jboss.seam.navigation.Pages.getKnownViewIds(Pages.java:1740)
      org.jboss.seam.web.RewriteFilter.getAllPatterns(RewriteFilter.java:131)
      org.jboss.seam.web.RewriteFilter.doFilter(RewriteFilter.java:48)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73)
      org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
      org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
      org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
      org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
      org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
      org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
      org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
      org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
      org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
      org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
      org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
      org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
      org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
      org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
      org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
      org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
      org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
      org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
      org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
      org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
      org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:436)
      org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:384)
      org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
      java.lang.Thread.run(Thread.java:662)



      Is there any way to improve this? I assume this cannot be improved by better hardware... I think also it is not out-of-connectors issue. I have set up number of threads for connector 8009 to 1200.


      Can anyone give any clue?
      Michal