The following is the related stack trace, whereby jj_expentry (or oldentry?) is
null.
---------------------------------------------------------------
if (oldentry.length == jj_expentry.length) {
---------------------------------------------------------------
SEVERE: Exception from Lucene search
com.hp.hpl.jena.query.larq.ARQLuceneException: search
at
com.hp.hpl.jena.query.larq.IndexLARQ.search(IndexLARQ.java:133)
at
com.hp.hpl.jena.query.larq.LuceneSearch.varSubject(LuceneSearch.java:199)
at
com.hp.hpl.jena.query.larq.LuceneSearch.execEvaluatedProtected(LuceneSearch.java:161)
at
com.hp.hpl.jena.query.larq.LuceneSearch.execEvaluated(LuceneSearch.java:70)
at
com.hp.hpl.jena.sparql.pfunction.PropertyFunctionEval.exec(PropertyFunctionEval.java:32)
at
com.hp.hpl.jena.sparql.pfunction.PropertyFunctionBase$RepeatApplyIterator.nextStage(PropertyFunctionBase.java:92)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.makeNextStage(QueryIterRepeatApply.java:94)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:55)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:69)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterProcedure.hasNextBinding(QueryIterProcedure.java:57)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:69)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterSort.sort(QueryIterSort.java:48)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterSort.<init>(QueryIterSort.java:40)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterSort.<init>(QueryIterSort.java:35)
at
com.hp.hpl.jena.sparql.engine.main.OpExecutor.execute(OpExecutor.java:348)
at
com.hp.hpl.jena.sparql.engine.main.ExecutionDispatch.visit(ExecutionDispatch.java:206)
at
com.hp.hpl.jena.sparql.algebra.op.OpOrder.visit(OpOrder.java:31)
at
com.hp.hpl.jena.sparql.engine.main.ExecutionDispatch.exec(ExecutionDispatch.java:33)
at
com.hp.hpl.jena.sparql.engine.main.OpExecutor.executeOp(OpExecutor.java:103)
at
com.hp.hpl.jena.sparql.engine.main.OpExecutor.execute(OpExecutor.java:355)
at
com.hp.hpl.jena.sparql.engine.main.ExecutionDispatch.visit(ExecutionDispatch.java:213)
at
com.hp.hpl.jena.sparql.algebra.op.OpProject.visit(OpProject.java:33)
at
com.hp.hpl.jena.sparql.engine.main.ExecutionDispatch.exec(ExecutionDispatch.java:33)
at
com.hp.hpl.jena.sparql.engine.main.OpExecutor.executeOp(OpExecutor.java:103)
at
com.hp.hpl.jena.sparql.engine.main.OpExecutor.execute(OpExecutor.java:79)
at com.hp.hpl.jena.sparql.engine.main.QC.execute(QC.java:40)
at
com.hp.hpl.jena.sparql.engine.main.QueryEngineMain.eval(QueryEngineMain.java:52)
at
com.hp.hpl.jena.sparql.engine.QueryEngineBase.evaluate(QueryEngineBase.java:124)
at
com.hp.hpl.jena.sparql.engine.QueryEngineBase.createPlan(QueryEngineBase.java:98)
at
com.hp.hpl.jena.sparql.engine.QueryEngineBase.getPlan(QueryEngineBase.java:86)
at
com.hp.hpl.jena.sparql.engine.main.QueryEngineMain$1.create(QueryEngineMain.java:91)
at
com.hp.hpl.jena.sparql.engine.QueryExecutionBase.getPlan(QueryExecutionBase.java:266)
at
com.hp.hpl.jena.sparql.engine.QueryExecutionBase.startQueryIterator(QueryExecutionBase.java:243)
at
com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execResultSet(QueryExecutionBase.java:248)
at
com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execSelect(QueryExecutionBase.java:94)
...
at
java.util.concurrent.FutureTask$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)
Caused by: java.lang.NullPointerException
at
org.apache.lucene.queryParser.QueryParser.jj_add_error_token(QueryParser.java:1774)
at
org.apache.lucene.queryParser.QueryParser.jj_scan_token(QueryParser.java:1723)
at
org.apache.lucene.queryParser.QueryParser.jj_3R_2(QueryParser.java:1611)
at
org.apache.lucene.queryParser.QueryParser.jj_3_1(QueryParser.java:1597)
at
org.apache.lucene.queryParser.QueryParser.jj_2_1(QueryParser.java:1589)
at
org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:1284)
at
org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:1241)
at
org.apache.lucene.queryParser.QueryParser.TopLevelQuery(QueryParser.java:1230)
at
org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:176)
at
com.hp.hpl.jena.query.larq.IndexLARQ.search(IndexLARQ.java:118)
... 41 more
From: Turri, Albert (ELS-NYC) [mailto:[email protected]]
Sent: Tuesday, March 25, 2014 1:28 PM
To: [email protected]
Subject: A question concerning a NullPointerException in QueryParser's
jj_add_error_token method
Hi,
I would like seek assistance regarding the following issue I'm
encountering.
I'm running Tomcat and have deployed Jena (2.6.2) and Lucene Core (2.9.0),
whereby Jena invokes the Lucene classes.
Typically everything is fine, but I have recently encountered a
NullPointerException, which I have resolved so far by rebooting Tomcat.
Please find enclosed the corresponding stack trace.
As this does not happen that often and as a reboot of Tomcat resolves this
issue, I am wondering if perhaps this is about consumption of resources.
Thank you,
Albert Turri
