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https://issues.apache.org/jira/browse/NET-532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elliot Shank updated NET-532:
-----------------------------
Attachment: threader.patch
Patch against current trunk that fixes my issue.
Rather than only pruning a completely empty node, it prunes nodes that have no
Threadable on the node or any of its children.
> NPE in nntp.Threader.thread() when all messages in a derived thread are
> missing.
> ---------------------------------------------------------------------------------
>
> Key: NET-532
> URL: https://issues.apache.org/jira/browse/NET-532
> Project: Commons Net
> Issue Type: Bug
> Components: NNTP
> Affects Versions: 3.0, 3.3
> Reporter: Elliot Shank
> Attachments: threader.patch
>
>
> I'm threading emails using the References: header. When I've got an
> incomplete set of messages (in this specific case, it's from one of the C++
> standards committee lists) such that I'm missing an entire thread, I get
> exceptions like this:
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.commons.net.nntp.Threader.gatherSubjects(Threader.java:342)
> at org.apache.commons.net.nntp.Threader.thread(Threader.java:81)
> at org.apache.commons.net.nntp.Threader.thread(Threader.java:47)
> What happens is that the graph returned by findRootSet() at line 71 will look
> something like
> ...
> <ThreadContainer A with Threadable>
> ...
> <ThreadContainer B without Threadable>
> <ThreadContainer ... without Threadable>
> <ThreadContainer ... without Threadable>
> <ThreadContainer ... without Threadable>
> <ThreadContainer ... without Threadable>
> <ThreadContainer ... without Threadable>
> <ThreadContainer ... without Threadable>
> <ThreadContainer C with Threadable>
> ...
> ...
> And, after pruneEmptyContainers() has had its way with things on line 75, the
> graph will be
> ...
> <ThreadContainer A with Threadable>
> ...
> <ThreadContainer B without Threadable>
> <ThreadContainer C with Threadable>
> ...
> ...
> when it should be
> ...
> <ThreadContainer A with Threadable>
> ...
> <ThreadContainer C with Threadable>
> ...
> ...
> I.e., ThreadContainer B should be eliminated entirely.
> As it is, with ThreadContainer B present, but not containing any children or
> a Threadable, gatherSubjects() chokes.
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