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https://issues.apache.org/jira/browse/LUCENE-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244268#comment-13244268
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Michael McCandless commented on LUCENE-3939:
--------------------------------------------
Hmm, that example has basically the same problem: when you call
Collections.reverseOrder() without passing it a Comparator, it will fall back
to natural order, ie, try to cast the incoming objects to Comparable... you
need to provide your own comparator that directly compares the two
TermVectorEntry instances...
> ClassCastException thrown in the map(String,int,TermVectorOffsetInfo[],int[])
> method in org.apache.lucene.index.SortedTermVectorMapper
> --------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3939
> URL: https://issues.apache.org/jira/browse/LUCENE-3939
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 3.0.2, 3.1, 3.4, 3.5
> Reporter: SHIN HWEI TAN
> Original Estimate: 0.05h
> Remaining Estimate: 0.05h
>
> The method "map" in the "SortedTermVectorMapper" class does not check the
> parameter "term" for the valid values. It throws ClassCastException when
> called with a invalid string for the parameter "term" (i.e., "var3.map("*",
> (-1), null, null)"). The exception thrown is due to an explict cast(i.e.,
> casting the return value of termToTVE.get(term) to type "TermVectorEntry").
> Suggested Fixes: Replace the beginning of the method body for the class
> "SortedTermVectorMapper" by changing it like this:
> public void map(String term, int frequency, TermVectorOffsetInfo[] offsets,
> int[] positions) {
> if(termToTVE.get(term) instanceof TermVectorEntry){
> TermVectorEntry entry = (TermVectorEntry) termToTVE.get(term);
> ...
> }
> }
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