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https://issues.apache.org/jira/browse/DIRMINA-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12709294#action_12709294
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Emmanuel Lecharny commented on DIRMINA-679:
-------------------------------------------
I might have been a bit in a hurry when I wrote the previous comment. The NPE
is most certainly due to a null encoder being used :
line 297 :
encoder.encode(session, message, encoderOut)
This can happen if the filter has been removed from the chain or if the session
has been closed. Wondering if the problem still occurs with trunk, as we have
fixed some concurrent access due to unsynchronized data structure being used at
some point ...
> NullPointerException in ProtocolCodecFilter.filterWrite
> -------------------------------------------------------
>
> Key: DIRMINA-679
> URL: https://issues.apache.org/jira/browse/DIRMINA-679
> Project: MINA
> Issue Type: Bug
> Affects Versions: 2.0.0-M4
> Reporter: John J. Franey
> Fix For: 2.0.0-RC1
>
>
> Looks like filterWrite obtains a reference from the session's attributes, but
> the desired attribute is not there.
> I am running max of 250 datagram sockets under load test for my application.
> Connections last about 60 seconds and released. A new connection is made to
> keep the total number of active connections up to 250.
> Over a period of two hours running this load test, this exception occured
> twice.
> org.apache.mina.filter.codec.ProtocolEncoderException:
> java.lang.NullPointerException
> at
> org.apache.mina.filter.codec.ProtocolCodecFilter.filterWrite(ProtocolCodecFilter.java:312)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.callPreviousFilterWrite(DefaultIoFilterChain.java:506)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.access$7(DefaultIoFilterChain.java:501)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.filterWrite(DefaultIoFilterChain.java:814)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.filterWrite(DefaultIoFilterChain.java:740)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.callPreviousFilterWrite(DefaultIoFilterChain.java:506)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.fireFilterWrite(DefaultIoFilterChain.java:498)
> at
> org.apache.mina.core.session.AbstractIoSession.write(AbstractIoSession.java:418)
> at
> org.apache.mina.core.session.AbstractIoSession.write(AbstractIoSession.java:359)
> ....
> Caused by: java.lang.NullPointerException
> at
> org.apache.mina.filter.codec.ProtocolCodecFilter.filterWrite(ProtocolCodecFilter.java:297)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.filterWrite(DefaultIoFilterChain.java:814)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.filterWrite(DefaultIoFilterChain.java:741)
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.fireFilterWrite(DefaultIoFilterChain.java:498)
> at
> org.apache.mina.core.session.AbstractIoSession.write(AbstractIoSession.java:359)
> ....
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