[jboss-user] [JBoss Seam] - Seam remoting poll failover

dave_cawthorn do-not-reply at jboss.com
Fri Sep 1 04:36:27 EDT 2006 

Hi All,

I have a seam page that is acting as a remote event log viewer by subscribing to a topic and then appending the topic message descriptions to the page as they come in. This all works beautifully until I kill the server the web page was connected to and try to fail over to the backup node. The web page doesn't error (like when there is only a single node that dies) but no new messages are recieved.

I turned on seam debugging in the page and here is the output of debug window. I kill the primary server just after the second poll request.  As you can see there is a response from the node that takes over (i checked this with ethereal) but its just a http 200 ok with no data.

Fri Sep 1 15:21:55 UTC+0800 2006: Request packet:



Fri Sep 1 15:21:55 UTC+0800 2006: Response packet:



Fri Sep 1 15:21:55 UTC+0800 2006: Request packet:



Fri Sep 1 15:22:25 UTC+0800 2006: Response packet:



Fri Sep 1 15:22:26 UTC+0800 2006: Request packet:



Fri Sep 1 15:22:59 UTC+0800 2006: Response packet:


And on the server that takes over I get the following error trace:

2006-09-01 15:17:53,299 1449788 ERROR [org.jboss.seam.servlet.SeamServletFilter] (http-0.0.0.0-8080-1:) Error
org.dom4j.DocumentException: Read timed out Nested exception: Read timed out
        at org.dom4j.io.SAXReader.read(SAXReader.java:484)
        at org.dom4j.io.SAXReader.read(SAXReader.java:343)
        at org.jboss.seam.remoting.PollHandler.handle(PollHandler.java:50)
        at org.jboss.seam.remoting.SeamRemotingServlet.doPost(SeamRemotingServlet.java:56)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
        at org.jboss.web.tomcat.tc5.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:95)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.jboss.web.tomcat.tc5.sso.ClusteredSingleSignOn.invoke(ClusteredSingleSignOn.java:461)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
        at java.lang.Thread.run(Thread.java:595)
Nested exception: 
java.net.SocketTimeoutException: Read timed out
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:129)
        at org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:747)
        at org.apache.coyote.http11.InternalInputBuffer$InputStreamInputBuffer.doRead(InternalInputBuffer.java:777)
        at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:115)
        at org.apache.coyote.http11.InternalInputBuffer.doRead(InternalInputBuffer.java:712)
        at org.apache.coyote.Request.doRead(Request.java:418)
        at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:284)
        at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:371)
        at org.apache.catalina.connector.InputBuffer.readByte(InputBuffer.java:293)
        at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:104)
        at org.apache.xerces.impl.XMLEntityManager$RewindableInputStream.read(Unknown Source)
        at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
        at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at org.dom4j.io.SAXReader.read(SAXReader.java:465)
        at org.dom4j.io.SAXReader.read(SAXReader.java:343)
        at org.jboss.seam.remoting.PollHandler.handle(PollHandler.java:50)
        at org.jboss.seam.remoting.SeamRemotingServlet.doPost(SeamRemotingServlet.java:56)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
        at org.jboss.web.tomcat.tc5.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:95)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.jboss.web.tomcat.tc5.sso.ClusteredSingleSignOn.invoke(ClusteredSingleSignOn.java:461)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
        at java.lang.Thread.run(Thread.java:595)

I went through the steps outlined in the clustered DVD demo and believe I have adapted it to my situation. 

I haven't had a real good look into remote.js yet (next point of call) but I wan't try and avoid hacking this so that if it it gets a blank response it will refresh the subscriptions on the new server.

Any help appreiciated...
Dave

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