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Posted to dev@mina.apache.org by "Emmanuel Lecharny (JIRA)" <ji...@apache.org> on 2008/11/11 01:03:44 UTC
[jira] Assigned: (DIRMINA-574) ClassCastException when a message is
written on a closed session.
[ https://issues.apache.org/jira/browse/DIRMINA-574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Emmanuel Lecharny reassigned DIRMINA-574:
-----------------------------------------
Assignee: Emmanuel Lecharny
> ClassCastException when a message is written on a closed session.
> -----------------------------------------------------------------
>
> Key: DIRMINA-574
> URL: https://issues.apache.org/jira/browse/DIRMINA-574
> Project: MINA
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.10, 1.1.7, 2.0.0-M1
> Reporter: Trustin Lee
> Assignee: Emmanuel Lecharny
> Priority: Blocker
> Fix For: 2.0.0-M4
>
>
> Steps to reproduce:
> 1) Connection is closed at the socket level.
> 2) A user writes a message.
> 3) the message is encoded by a ProtocolCodecFilter.
> 4) MINA notices the closed socket and fires a sessionClosed event.
> 5) After the sessionClosed event is fired, IoFilterChain.clear() is called.
> 6) MINA tries to write the user write request, but the session is closed already - all write requests are discarded.
> 7) Before MINA discards all write requests, MINA checks if the first item in the queue is an empty buffer, which means a special separator which is handled by ProtocolCodecFilter.
> 8) If there's an empty buffer in the head of the queue, MINA fires a messageSent event with the empty buffer in the hope that ProtocolCodecFilter will catch it.
> 9) However, the filter chain is empty and therefore IoHandler implementation gets ClassCastException.
> A possible workaround is just to ignore the exception, but we need to provide a correct fix for this issue.
> The following is the stack trace that explains this scenario:
> 25151 [SocketAcceptorIoProcessor-0.4] WARN ServerPortSessionHandler -
> > [/127.0.0.1:57120 <http://127.0.0.1:57120>]
> > java.lang.ClassCastException:
> > org.apache.mina.filter.codec.ProtocolCodecFilter$MessageByteBuffer
> > incompatible with com.daishin.eai.adapter.socket.message.Por
> > tMessage
> > at
> > com.daishin.eai.adapter.socket.handler.ServerPortSessionHandler.messageSent(ServerPortSessionHandler.java:80)
> > at
> > org.apache.mina.common.support.AbstractIoFilterChain$TailFilter.messageSent(AbstractIoFilterChain.java:579)
> > at
> > org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageSent(AbstractIoFilterChain.java:320)
> > at
> > org.apache.mina.common.support.AbstractIoFilterChain.access$1200(AbstractIoFilterChain.java:53)
> > at
> > org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageSent(AbstractIoFilterChain.java:653)
> > at
> > org.apache.mina.common.support.AbstractIoFilterChain$HeadFilter.messageSent(AbstractIoFilterChain.java:504)
> > at
> > org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageSent(AbstractIoFilterChain.java:320)
> > at
> > org.apache.mina.common.support.AbstractIoFilterChain.fireMessageSent(AbstractIoFilterChain.java:314)
> > at
> > org.apache.mina.transport.socket.nio.SocketIoProcessor.releaseWriteBuffers(SocketIoProcessor.java:359)
> > at
> > org.apache.mina.transport.socket.nio.SocketIoProcessor.doFlush(SocketIoProcessor.java:314)
> > at
> > org.apache.mina.transport.socket.nio.SocketIoProcessor.access$500(SocketIoProcessor.java:45)
> > at
> > org.apache.mina.transport.socket.nio.SocketIoProcessor$Worker.run(SocketIoProcessor.java:488)
> > at
> > org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
> > at
> > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
> > at
> > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
> > at java.lang.Thread.run(Thread.java:810)
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