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

["Andy Seaborne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne closed JENA-792.
------------------------------
       Resolution: Fixed
    Fix Version/s: Jena 2.12.2
         Assignee: Andy Seaborne

Fixed as you describe.  Thank you.

> 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
>            Assignee: Andy Seaborne
>              Labels: easyfix
>             Fix For: Jena 2.12.2
>
>
> While unit testing an implementation of the DatasetGraph interface I ran in to this bug in DatasetGraphCollection:
> {code}
> @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"));
> }
> {code}
> This throws:
> {code}
> 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
> .....
> {code}
> 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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