gwt Comet Heartbeat

[Noor]

Hi, I just want to know what is a heartbeat in gwt comet. Is is that
the client asynchronously send a call to the server??

[Richard Zschech]

Hi Noor,

The heartbeats are sent from the server to the client to keep the TCP
connection alive. The server sends out the heartbeats if no data has
been sent for a certain amount of time. The client checks that
heartbeats are received and generates a connection error when they are
not received.

This is all handled transparently by the gwt-comet library. You are
safe to ignore the onHeartbeat() callback. You might want to use it to
make a connection status light on your GUI blink or something flashy :-
P

From Richard.

[Noor]

I think that's the problem I am getting,I am using the jetty that
comes on gwt plugin in eclipse

Does someone know anything about this??
[WARN] Error sending heartbeat
org.mortbay.jetty.EofException
at org.mortbay.jetty.HttpGenerator.flush(HttpGenerator.java:760)
at org.mortbay.jetty.AbstractGenerator
$Output.flush(AbstractGenerator.java:566)
at org.mortbay.jetty.HttpConnection$Output.flush(HttpConnection.java:
911)
at
net.zschech.gwt.comet.server.deflate.DeflaterOutputStream.flush(DeflaterOutputStream.java:
100)
at
net.zschech.gwt.comet.server.impl.CountOutputStream.flush(CountOutputStream.java:
64)
at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:278)
at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:122)
at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:212)
at
net.zschech.gwt.comet.server.impl.CometServletResponseImpl.flush(CometServletResponseImpl.java:
374)
at
net.zschech.gwt.comet.server.impl.CometServletResponseImpl.heartbeat(CometServletResponseImpl.java:
353)
at
net.zschech.gwt.comet.server.impl.ManagedStreamCometServletResponseImpl.heartbeat(ManagedStreamCometServletResponseImpl.java:
98)
at
net.zschech.gwt.comet.server.impl.BlockingAsyncServlet.suspend(BlockingAsyncServlet.java:
51)
at
net.zschech.gwt.comet.server.impl.CometServletResponseImpl.suspend(CometServletResponseImpl.java:
277)
at
net.zschech.gwt.comet.server.CometServlet.doCometImpl(CometServlet.java:
157)
at net.zschech.gwt.comet.server.CometServlet.doGet(CometServlet.java:
108)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
362)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at
org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:
49)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
505)
at org.mortbay.jetty.HttpConnection
$RequestHandler.headerComplete(HttpConnection.java:829)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
395)
at org.mortbay.thread.QueuedThreadPool
$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.io.IOException: An established connection was aborted
by the software in your host machine
at sun.nio.ch.SocketDispatcher.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:33)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:72)
at sun.nio.ch.IOUtil.write(IOUtil.java:28)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:334)
at org.mortbay.io.nio.ChannelEndPoint.flush(ChannelEndPoint.java:160)
at
org.mortbay.io.nio.SelectChannelEndPoint.flush(SelectChannelEndPoint.java:
207)
at org.mortbay.jetty.HttpGenerator.flush(HttpGenerator.java:693)

[Noor]

Problem Solved,
Thanks

[shama...@gmail.com]

What the solution was?

[shama...@gmail.com]

...ah, forgot dev-mode part for URL, thanks

[lorenzo belli]

Could someone please explain how to avoid this error?
I'm getting it all the time.

[shama...@gmail.com]

Seems it happens time to time. The solution I have written before not helped in my case to be truth. See my post in this group and this issue: http://code.google.com/p/gwt-comet/issues/detail?id=20

[Emil Daoura]

How did you solved it?

On Monday, November 29, 2010 1:35:59 PM UTC+1, Noor wrote:

Problem Solved,
Thanks

[kapil...@gmail.com]

Hi Noor,

Can you please let us know how did you solved the issue.