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https://issues.apache.org/jira/browse/LUCENE-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13243727#comment-13243727
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Michael McCandless commented on LUCENE-3939:
--------------------------------------------
bq. For example, if the first invocation of the method "map" is commented
out(as below), then there is no exception thrown. In this case, the Comparator
is still null.
This is because of sneakiness/trapiness in TreeSet (and maybe Java's type
erasure for generics), I think.
Ie, on inserting only one object into it, it does not need to cast that object
to Comparator (there's nothing to compare to). But on adding a 2nd object, it
will try to cast.
> 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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