Hibernate Search NPE and other id errors

[Bai Shen]

I have object A, which is an abstract class. It has concrete implementations A1, A2, etc. They are all mapped using the same hbm.xml file, with each class using separate tables.

I'm trying to implement Hibernate Search. I added @Indexed and @DocumentId to A1, A2, etc, but not A. A does have an id, which ends up being the same as the ones for the subclasses.

Whenever I run my program, I get errors about the id being null. This is without calling anything specific to the search. I'm not sure why it can't find the id of the object.

10 Mar 2011 16:13:33,307 [Hibernate Search: Directory writer-1] ERROR org.hibernate.search.backend.impl.lucene.PerDPQueueProcessor  - Unexpected error in Lucene Backend: 
java.lang.NullPointerException
	at org.apache.lucene.index.TermBuffer.set(TermBuffer.java:95)
	at org.apache.lucene.index.SegmentTermEnum.scanTo(SegmentTermEnum.java:160)
	at org.apache.lucene.index.TermInfosReader.get(TermInfosReader.java:232)
	at org.apache.lucene.index.TermInfosReader.get(TermInfosReader.java:179)
	at org.apache.lucene.index.SegmentTermDocs.seek(SegmentTermDocs.java:57)
	at org.apache.lucene.index.DocumentsWriter.applyDeletes(DocumentsWriter.java:1046)
	at org.apache.lucene.index.DocumentsWriter.applyDeletes(DocumentsWriter.java:1004)
	at org.apache.lucene.index.IndexWriter.applyDeletes(IndexWriter.java:4566)
	at org.apache.lucene.index.IndexWriter.doFlushInternal(IndexWriter.java:3756)
	at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3595)
	at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3585)
	at org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:1717)
	at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1680)
	at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1644)
	at org.hibernate.search.backend.Workspace.closeIndexWriter(Workspace.java:211)
	at org.hibernate.search.backend.impl.lucene.PerDPQueueProcessor.run(PerDPQueueProcessor.java:113)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
10 Mar 2011 16:13:33,307 [Hibernate Search: Directory writer-1] ERROR org.hibernate.search.exception.impl.LogErrorHandler  - Exception occurred java.lang.NullPointerException
Primary Failure:
	Entity object.A1  Id null  Work Type  org.hibernate.search.backend.DeleteLuceneWork
Subsequent failures:
	Entity object.A1  Id null  Work Type  org.hibernate.search.backend.AddLuceneWork

If I actually try and do a search, I get the following error. ContextUtil is a context listener and I'm just using it to make sure my test code runs at server startup.

Mar 10, 2011 5:01:26 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class ContextUtil
org.hibernate.QueryException: could not resolve property: idNumber of: object.A1
	at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:81)
	at org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:75)
	at org.hibernate.persister.entity.AbstractEntityPersister.getSubclassPropertyTableNumber(AbstractEntityPersister.java:1482)
	at org.hibernate.persister.entity.BasicEntityPropertyMapping.toColumns(BasicEntityPropertyMapping.java:62)
	at org.hibernate.persister.entity.AbstractEntityPersister.toColumns(AbstractEntityPersister.java:1457)
	at org.hibernate.persister.entity.JoinedSubclassEntityPersister.toColumns(JoinedSubclassEntityPersister.java:696)
	at org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumns(CriteriaQueryTranslator.java:483)
	at org.hibernate.loader.criteria.CriteriaQueryTranslator.findColumns(CriteriaQueryTranslator.java:498)
	at org.hibernate.criterion.InExpression.toSqlString(InExpression.java:52)
	at org.hibernate.criterion.Junction.toSqlString(Junction.java:82)
	at org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:380)
	at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:113)
	at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:82)
	at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:92)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1697)
	at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)
	at org.hibernate.search.engine.ObjectLoaderHelper.initializeObjects(ObjectLoaderHelper.java:116)
	at org.hibernate.search.engine.QueryLoader.executeLoad(QueryLoader.java:80)
	at org.hibernate.search.engine.AbstractLoader.load(AbstractLoader.java:70)
	at org.hibernate.search.query.FullTextQueryImpl.list(FullTextQueryImpl.java:317)
	at SearchUtil.search(SearchUtil.java:45)
	at SearchUtil.init(SearchUtil.java:29)
	at ContextUtil.contextInitialized(ContextUtil.java:18)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
	at org.apache.catalina.core.StandardService.start(StandardService.java:516)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:593)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

It seems that the translation from the lucene query to the hibernate one isn't properly mapping the fields.


Any help would be appreciated.

TIA.

[Bai Shen]

Okay, I fixed the search error. I had to move the @DocumentId tag from the concrete subclasses to the abstract superclass.

But I'm still getting the NPE whenever I do anything with the database. Any ideas why?