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Date: Fri, 1 Nov 2013 20:08:37 +0100
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Subject: org.apache.lucene.search.TopScoreDocCollector throws
 NullPointerException
From: Thomas Fuchs <tfuchs@lexetius.com>
To: java-user@lucene.apache.org
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Hi,

I have a webapp with a working Lucene search function. The indexed
documents contain among others two TextFields called "name" and
"fulltext". The "name" TextField holds only one term, for example
"bgh". The default field for query terms is "fulltext". The query
"+name:bgh" leads to a NullPointerException thrown by
org.apache.lucene.search.TopScoreDocCollector. Here are some lines
which I detached from my webapp to illustrate the situation:

[=E2=80=A6]

IndexWriter writer =3D [=E2=80=A6]

Document doc =3D new Document();
doc.add(new TextField("name", "bgh", Field.Store.NO));
doc.add(new TextField("fulltext", "[A long string of text.]", Field.Store.N=
O));

writer.addDocument(doc);

[=E2=80=A6]

IndexSearcher searcher =3D [=E2=80=A6]

Analyzer analyzer =3D new StandardAnalyzer(Version.LUCENE_45);
QueryParser parser =3D new QueryParser(Version.LUCENE_45, "fulltext", analy=
zer);
Query query =3D parser.parse("+name:bgh");
TopScoreDocCollector collector =3D TopScoreDocCollector.create(0x100, true)=
;
searcher.search(query, collector);
ScoreDoc[] hits =3D collector.topDocs().scoreDocs;

[=E2=80=A6]

Line "searcher.search(query, collector);" of "Search.java:93" throws:

java.lang.NullPointerException
at org.apache.lucene.search.TopScoreDocCollector$InOrderTopScoreDocCollecto=
r.collect(TopScoreDocCollector.java:54)
at org.apache.lucene.search.Scorer.score(Scorer.java:65)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:627)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:309)
at com.lexetius.iudicia.Search.getResult(Search.java:93)
at com.lexetius.iudicia.SearchPanel$1.onSubmit(SearchPanel.java:29)
at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1259)
at org.apache.wicket.markup.html.form.Form.process(Form.java:925)
at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:771)
at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:704)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav=
a:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor=
Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListene=
rInterface.java:258)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterfa=
ce.java:216)
at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.i=
nvokeListener(ListenerInterfaceRequestHandler.java:240)
at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.r=
espond(ListenerInterfaceRequestHandler.java:226)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(Req=
uestCycle.java:861)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStac=
k.java:64)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:2=
61)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle=
.java:218)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(Req=
uestCycle.java:289)
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketF=
ilter.java:259)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter=
.java:201)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:=
282)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHan=
dler.java:1474)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:49=
9)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java=
:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:5=
33)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.=
java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.=
java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428=
)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.j=
ava:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.j=
ava:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java=
:135)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(Context=
HandlerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollect=
ion.java:154)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.ja=
va:116)
at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.j=
ava:317)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.ja=
va:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHt=
tpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConn=
ection.java:960)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(A=
bstractHttpConnection.java:1021)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.=
java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPo=
int.java:668)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoi=
nt.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.j=
ava:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.ja=
va:543)
at java.lang.Thread.run(Thread.java:695)

I don't think thats an expected behavior and it is a bug in
org.apache.lucene.search.TopScoreDocCollector. Am I wrong?

Regards

- Thomas

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