Using v3.3, I'm getting problems like
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)
when a particular thread branch has no actual messages in it.
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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