I believe the most common case is when you do a search with Sort (AUTO
feature), and one of the fields you sort by is empty. The underlying
IndexSearcher throws a RuntimeException and "docs" (result from
searcher.search()) is never set, which results in a NullPointerException
when hits() is called later on after the searcher thread is joined.
I'm not sure if there are other scenarios where searcher.search() throws
exceptions other than IOException (which is handled by
MultiSearcherThread). These will result in NullpointerExceptions as well.
Not much help I guess, but perhaps some more insight.
/Ronnie
Zhang, Lisheng wrote:
Hi,
I have not received any feedback yet, any comments
would be greatly appreciated!
Lisheng
-----Original Message-----
From: Zhang, Lisheng
Sent: Thursday, December 01, 2005 12:30 PM
To: 'java-user@lucene.apache.org'
Subject: NullPointerException in ParallelMultiSearcher
Hi,
We are using lucene v1.4.3 for some time, in general it is working well.
We often try to search multiple collections at the same time, so we
are using ParallelMultiSearcher, but sometimes we got the following
exception:
########
java.lang.NullPointerException
at
org.apache.lucene.search.MultiSearcherThread.hits(ParallelMultiSearcher.java
:281)
at
org.apache.lucene.search.ParallelMultiSearcher.search(ParallelMultiSearcher.
java:134)
at org.apache.lucene.search.Hits.getMoreDocs(Hits.java:64)
at org.apache.lucene.search.Hits.<init>(Hits.java:51)
at org.apache.lucene.search.Searcher.search(Searcher.java:41)
########
It seems this happens when searching site is heavily used, also when
we switch to MultiSearcher, we never see this kind of problems?
Your guidance would be very appreciated!
Best regards, Lisheng
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________________________________________
Ronnie Kolehmainen
Systems Developer
Electronic Publishing Centre
Uppsala University Library
+46 (0)18 471 5847
mailto:[EMAIL PROTECTED]
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