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From "Edward W. Rouse" <ero...@comsquared.com>
Subject RE: NullPointerException using IndexReader.termDocs when there are no matches
Date Fri, 18 May 2012 13:37:21 GMT
Thanks, I missed that. And the API doc fails to mention it, though it is
pretty standard for a next() method.

> -----Original Message-----
> From: Michael McCandless [mailto:lucene@mikemccandless.com]
> Sent: Thursday, May 17, 2012 6:20 PM
> To: java-user@lucene.apache.org
> Subject: Re: NullPointerException using IndexReader.termDocs when there
> are no matches
> 
> I think you need to pay attention to what td.next() returned; I
> suspect in your case it returned false which means you cannot use any
> of its APIs (.doc(), .freq(), etc.) after that.
> 
> Mike McCandless
> 
> http://blog.mikemccandless.com
> 
> On Thu, May 17, 2012 at 5:52 PM, Edward W. Rouse
> <erouse@comsquared.com> wrote:
> > Lucene 3.6, java 1.6 I get the following:
> >
> > java.lang.NullPointerException at
> >
> org.apache.lucene.index.DirectoryReader$MultiTermDocs.doc(DirectoryRead
> er.ja
> > va:1179)
> >
> > when running this code:
> >
> > IndexReader reader = this.getReader(index);
> > int d = -1;
> > TermDocs td = reader.termDocs(this.createIdTerm(id));
> > if(td != null)
> > {
> >  td.next();
> >  d = td.doc();
> > }
> >
> > private Term createIdTerm(String id)
> > {
> >  return new Term(Constants.DEFAULT_ID_FIELD, id);
> > }
> >
> > At the time this code runs I would expect that td would be null since
> there
> > are no documents in the index that match the term, but that is not
> the case.
> > Instead I get the NPE when trying td.doc(). I can wrap the code in a
> > try/catch for that line, but I think there must be a better way to
> determine
> > if I got any matches for a Term.
> >
> > Edward W. Rouse
> > Comsquared System, Inc.
> > 770-734-5301
> >
> >
> >
> >
> > ---------------------------------------------------------------------
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> >
> 
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