search exception in servlet!

[xuemei li]

hi,all

I am using lucene to search.It works fine before I put the code into the
doPost of servlet.But after that it will throw exception when I use
servlet.
This is the exception sentence:
            IndexSearcher searcher = new IndexSearcher(indexPath);
              hits=searcher.search(query);-->exception

What's the problem?What is the difference between servlet java program and
non-servlet java program?

Any reply will be appreciated.

Thanks,
Xuemei Li



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