[JENA-27] NullPointerException at com.hp.hpl.jena.sdb.compiler.SDB_QC.exec (PATCH)

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Done
• Fix Version/s: Jena 2.11.0
• Component/s: SDB

Environment

java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) 64-Bit Server VM (build 17.1-b03, mixed mode)

• Assignee: Andy Seaborne
• Reporter: Gavin Carothers
• Created: 12/Jan/11 21:22
• Updated: 01/Feb/15 19:11
• Resolved: 01/Feb/15 19:11

Description

Unable to execute SPARQL queries with SDB. OpSQL's bridge is null in at least some cases. Patch works, but seems odd as the code seems to indicate that a op3 (3rd pass?) shouldn't need a bridge any more?

java.lang.NullPointerException
at com.hp.hpl.jena.sdb.compiler.SDB_QC.exec(SDB_QC.java:65)
at com.hp.hpl.jena.sdb.compiler.OpSQL.exec(OpSQL.java:53)
at com.hp.hpl.jena.sdb.engine.QueryEngineSDB.eval(QueryEngineSDB.java:117)
at
com.hp.hpl.jena.sparql.engine.QueryEngineBase.evaluate(QueryEngineBase.java:138)
at
com.hp.hpl.jena.sparql.engine.QueryEngineBase.createPlan(QueryEngineBase.java:109)
at
com.hp.hpl.jena.sparql.engine.QueryEngineBase.getPlan(QueryEngineBase.java:97)
at
com.hp.hpl.jena.sdb.engine.QueryEngineSDB$QueryEngineFactorySDB.create(QueryEngineSDB.java:142)
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 com.oreilly.rdf.tenuki.SDBBugTest.testForSDBBug(SDBBugTest.java:47)

Test Case:
https://github.com/norcalrdf/Tenuki/blob/0.4-bugfixes/src/test/java/com/oreilly/rdf/tenuki/SDBBugTest.java

Patch:
https://gist.github.com/675719