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From Holger Hoffstätte (JIRA) <j...@apache.org>
Subject [jira] [Commented] (AVRO-842) Internal NPE when accessing proxy to a closed server endpoint
Date Fri, 01 Jul 2011 08:50:28 GMT

    [ https://issues.apache.org/jira/browse/AVRO-842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13058260#comment-13058260
] 

Holger Hoffstätte commented on AVRO-842:
----------------------------------------

Just gave patch v3 a try and it now works fine. The VM even correctly exits when the client
is not shut down explicitly, since the ExecutorService reaps its thread after a minute and
then cleanly exits. This shows that there are no accidental leaks. nice :)


> Internal NPE when accessing proxy to a closed server endpoint
> -------------------------------------------------------------
>
>                 Key: AVRO-842
>                 URL: https://issues.apache.org/jira/browse/AVRO-842
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.5.1
>         Environment: generic
>            Reporter: Holger Hoffstätte
>            Assignee: James Baldassari
>             Fix For: 1.5.2
>
>         Attachments: AVRO-842-v2.patch, AVRO-842-v3.patch, AVRO-842.patch, CrashTest.java
>
>
> For development of an avro-based transport for remote OSGi services I had to wrap &
unwind transport-level exceptions into proper exceptions thrown to a client. One such scenario
is accessing a disconnected/dead endpoint, which should be a detectable condition. This works
fine with the SaslSocketTransceiver (where my wrapper can properly detect the IO Exception),
but not with Netty which hiccups with an internal NPE.
> Generally speaking any transport-level and remote-endpoint exceptions must not only be
clearly detectable (either directly by client code or wrapper infrastructure around avro)
but also distinguishable from another.

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