[hibernate-issues] [Hibernate-JIRA] Created: (HSEARCH-741) NPE using two fulltext filters, one of them matching nothing (some filters only)

[Sanne Grinovero (JIRA)]

NPE using two fulltext filters, one of them matching nothing (some filters only)
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                 Key: HSEARCH-741
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-741
             Project: Hibernate Search
          Issue Type: Bug
    Affects Versions: 3.4.0.Final, 3.3.0.Final, 3.2.1, 3.2.0.Final, 3.1.1.GA, 3.1.0.GA
            Reporter: Sanne Grinovero
            Assignee: Sanne Grinovero
             Fix For: 3.5


It seems that some filter implementations are allowed to return null instead of an empty iterator if they don't match any document.
In this case if multiple filters are enabled, and they are eligible for bitset merging, and no matches where found, we get:

{code}java.lang.NullPointerException
    org.hibernate.search.filter.AndDocIdSet.findFirstTargetPosition(AndDocIdSet.java:144)
    org.hibernate.search.filter.AndDocIdSet.makeDocIdSetOnAgreedBits(AndDocIdSet.java:89)
    org.hibernate.search.filter.AndDocIdSet.buildBitSet(AndDocIdSet.java:81)
    org.hibernate.search.filter.AndDocIdSet.iterator(AndDocIdSet.java:60)
    org.apache.lucene.search.IndexSearcher.searchWithFilter(IndexSearcher.java:550)
    org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:525)
    org.hibernate.search.query.engine.impl.QueryHits.updateTopDocs(QueryHits.java:219)
    org.hibernate.search.query.engine.impl.QueryHits.<init>(QueryHits.java:127)
    org.hibernate.search.query.engine.impl.HSQueryImpl.getQueryHits(HSQueryImpl.java:419)
    org.hibernate.search.query.engine.impl.HSQueryImpl.queryEntityInfos(HSQueryImpl.java:222)
    org.hibernate.search.query.hibernate.impl.FullTextQueryImpl.list(FullTextQueryImpl.java:206)
    com.example.dao.impl.DaoImpl.search(Unknown Source)
    ....{code}

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