CachingWrapperFilter throws NPE when Filter.getDocIdSet() returns null ----------------------------------------------------------------------
Key: LUCENE-2478 URL: https://issues.apache.org/jira/browse/LUCENE-2478 Project: Lucene - Java Issue Type: Bug Affects Versions: 3.0.1, 3.0, 2.9.2, 2.9.1 Reporter: Uwe Schindler Assignee: Uwe Schindler Fix For: 2.9.3, 3.0.2, 3.1, 4.0 Followup for [http://www.lucidimagination.com/search/document/1014ea92f15677bd/filter_getdocidset_returning_null_and_what_this_means_for_cachingwrapperfilter]: Daniel Noll is seeing an exception like this: {noformat} java.lang.NullPointerException at org.apache.lucene.search.CachingWrapperFilter.docIdSetToCache(CachingWrapperFilter.java:84) at org.apache.lucene.search.CachingWrapperFilter.getDocIdSet(CachingWrapperFilter.java:112) at com.nuix.storage.search.LazyConstantScoreQuery$LazyFilterWrapper.getDocIdSet(SourceFile:91) at org.apache.lucene.search.ConstantScoreQuery$ConstantScorer.<init>(ConstantScoreQuery.java:116) at org.apache.lucene.search.ConstantScoreQuery$ConstantWeight.scorer(ConstantScoreQuery.java:81) at org.apache.lucene.search.BooleanQuery$BooleanWeight.scorer(BooleanQuery.java:297) at org.apache.lucene.search.BooleanQuery$BooleanWeight.scorer(BooleanQuery.java:297) at org.apache.lucene.search.QueryWrapperFilter$2.iterator(QueryWrapperFilter.java:75) {noformat} The class of our own is just an intermediary which delays creating the Filter object... {code} @Override public DocIdSet getDocIdSet(IndexReader reader) throws IOException { if (delegate == null) { delegate = factory.createFilter(); } return delegate.getDocIdSet(reader); } {code} Tracing through the code in CachingWrapperFilter, I can see that this NPE would occur if getDocIdSet() were to return null. The Javadoc on Filter says that null will be returned if no documents will be accepted by the filter, but it doesn't seem that Lucene itself is handling null return values correctly, so which is correct? The code or the Javadoc? Supposing that null really is OK, does this cause any problems with how CachingWrapperFilter is implementing the caching? I notice it's calling get() and then comparing against null so it wouldn't appear that it can distinguish "the entry isn't in the cache" from "the entry is in the cache but it's null". -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online. --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org