[jira] [Created] (JENA-792) DatasetGraphCollection throws NullPointerException when calling contains() with non-existing graph

[Gert van Valkenhoef (JIRA)]

Gert van Valkenhoef created JENA-792:
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             Summary: DatasetGraphCollection throws NullPointerException when 
calling contains() with non-existing graph
                 Key: JENA-792
                 URL: https://issues.apache.org/jira/browse/JENA-792
             Project: Apache Jena
          Issue Type: Bug
          Components: Jena
    Affects Versions: Jena 2.12.0
         Environment: Ubuntu 14.04 and Eclipse Luna. Jena, Fuseki, and JUnit on 
the classpath.
            Reporter: Gert van Valkenhoef


While unit testing an implementation of the DatasetGraph interface I ran in to 
this bug in DatasetGraphCollection:

        @Test public void test() {
                DatasetGraph mem = DatasetGraphFactory.createMem();
                DatasetGraph ds = DatasetGraphFactory.create(mem);
                
ds.contains(NodeFactory.createURI("http://example.com/DoesNotExist";),
                                
NodeFactory.createURI("http://example.com/subject";),
                                
NodeFactory.createURI("http://example.com/predicate";),
                                
NodeFactory.createURI("http://example.com/object";));
        }

This throws:

java.lang.NullPointerException
        at 
com.hp.hpl.jena.sparql.core.DatasetGraphCollection.findInSpecificNamedGraph(DatasetGraphCollection.java:66)
        at 
com.hp.hpl.jena.sparql.core.DatasetGraphCollection.findInSpecificNamedGraph(DatasetGraphCollection.java:34)
        at 
com.hp.hpl.jena.sparql.core.DatasetGraphBaseFind.findNG(DatasetGraphBaseFind.java:59)
        at 
com.hp.hpl.jena.sparql.core.DatasetGraphBaseFind.find(DatasetGraphBaseFind.java:48)
        at 
com.hp.hpl.jena.sparql.core.DatasetGraphBase.contains(DatasetGraphBase.java:131)
        at
.....

It seems that the null check in findInSpecificNamedGraph is checking the wrong 
variable (it checks g == null but shoud check graph == null).



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