[JENA-2033] SPARQL Update parsing fails

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Jena 4.0.0
• Component/s: ARQ
• Assignee: Andy Seaborne
• Reporter: Florian Kleedorfer
• Created: 04/Feb/21 09:59
• Updated: 01/Apr/21 09:21
• Resolved: 06/Feb/21 20:56

Description

My project depends on 3.18.0-SNAPSHOT.

In a test, the following code snippet recently stopped working:

String sparqlQuery =
"PREFIX msg: <https://w3id.org/won/message#> \n" 
+ "DELETE { \n" + " GRAPH ?g {?s ?p ?o} \n" "} \n" 
+ "WHERE { \n" + " GRAPH ?g { ?s ?p ?o } \n" 
+ " { SELECT (GROUP_CONCAT(?content; separator=\" \") as ?contentGraphs) \n" 
+ " WHERE { GRAPH <urn:x-arq:UnionGraph> { ?msg msg:content ?content } \n" 
+ " }\n" 
+ "} \n" 
+ "FILTER (!contains(?contentGraphs,str(?g))) \n" 
+ "} \n";

UpdateRequest update = UpdateFactory.create(sparqlQuery);

The following exception is thrown:

org.apache.jena.sparql.ARQInternalErrorException: Parser query object is null

at org.apache.jena.sparql.lang.SPARQLParserBase.pushQuery(SPARQLParserBase.java:216)
  at org.apache.jena.sparql.lang.SPARQLParserBase.startSubSelect(SPARQLParserBase.java:222)  
  at org.apache.jena.sparql.lang.arq.ARQParser.GroupGraphPattern(ARQParser.java:2316)  
  at org.apache.jena.sparql.lang.arq.ARQParser.GroupOrUnionGraphPattern(ARQParser.java:2876)  
  at org.apache.jena.sparql.lang.arq.ARQParser.GraphPatternNotTriples(ARQParser.java:2501)  
  at org.apache.jena.sparql.lang.arq.ARQParser.GroupGraphPatternSub(ARQParser.java:2393)  
  at org.apache.jena.sparql.lang.arq.ARQParser.GroupGraphPattern(ARQParser.java:2324)  
  at org.apache.jena.sparql.lang.arq.ARQParser.Modify(ARQParser.java:1876)  
  at org.apache.jena.sparql.lang.arq.ARQParser.Update1(ARQParser.java:1641)  
  at org.apache.jena.sparql.lang.arq.ARQParser.Update(ARQParser.java:1573)  
  at org.apache.jena.sparql.lang.arq.ARQParser.UpdateUnit(ARQParser.java:61)  
  at org.apache.jena.sparql.lang.ParserARQUpdate.executeParse(ParserARQUpdate.java:42)  
  at org.apache.jena.sparql.lang.UpdateParser.parse(UpdateParser.java:46)  
  at org.apache.jena.update.UpdateFactory.make(UpdateFactory.java:87)  
  at org.apache.jena.update.UpdateFactory.create(UpdateFactory.java:78)  
  at org.apache.jena.update.UpdateFactory.create(UpdateFactory.java:56)  
  at org.apache.jena.update.UpdateFactory.create(UpdateFactory.java:46)  
  at won.utils.goals.GoalInstantiationProducer.<init>(GoalInstantiationProducer.java:67)  

 

I did not find any related discussions or changes, so I suspect this is an unintended side effect of some change, hence the classification as a bug. Please excuse if there is something I overlooked.