QueryParser throwing null pointer exception if input is invalid
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                 Key: LUCENE-2987
                 URL: https://issues.apache.org/jira/browse/LUCENE-2987
             Project: Lucene - Java
          Issue Type: Bug
          Components: QueryParser
    Affects Versions: 3.0.2
            Reporter: Ramesh


I was using org.apache.lucene.queryParser.QueryParser for parsing the input.
My input:
Input query string:  "category:(4 or 6 or 8)"
Analyzer: StandardAnalyzer
QueryParser's parse() method is resulting in Null Pointer Exception.

If i give input query string as "category:(4 OR 6 OR 8)" which is uppercase 
'OR', it works fine and i get the desired results.
I'm seeing the problem only with lower case 'or'

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