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https://issues.apache.org/jira/browse/DIRMINA-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703358#action_12703358
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Emmanuel Lecharny commented on DIRMINA-679:
-------------------------------------------
Ok, after having checked the ProtocolCodecFilter code, I'm pretty sure that the
NPE is produced by your codec implementation. The ProtocolCodecFilter class
just propagate the thrown exception.
One more thing :
- we may want to encapsulate the user codec excpetion in order to give a better
information about what happened. Something like :
org.apache.mina.filter.codec.ProtocolEncoderException: The encoder/decoder has
generated a 'Null Pointer Exception'. The cause is :
blah...
> 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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