[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1814) DataModel wrapped data is set to null by ManagedEntityIdentityInterceptor

[Derek Cornelius (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-1814?page=comments#action_12385937 ] 
            
Derek Cornelius commented on JBSEAM-1814:
-----------------------------------------

I am also getting this problem, if you use the HibernateEntityQuery, once the getDataModel() call is executed, the "restrictions" member variable is set to null which causes a NullPointerException on subsequent usages of the Query object (e.g. the next call to getResultCount() causes an exception). The Query object has been coded such that "restrictions" can never be null, which I think is correct as the you want the count to include the same restrictions that the data model is using.

> DataModel wrapped data is set to null by ManagedEntityIdentityInterceptor
> -------------------------------------------------------------------------
>
>                 Key: JBSEAM-1814
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1814
>             Project: JBoss Seam
>          Issue Type: Bug
>    Affects Versions: 2.0.0.BETA1
>         Environment: seam cvs (20070816.1709)
>            Reporter: Matt Drees
>            Priority: Minor
>             Fix For: 2.0.x
>
>
> The following test fails:
> @Name("dataModelComponent")
> @Scope(ScopeType.CONVERSATION)
> public class DataModelComponent extends EntityQuery {
>    @Override
>    public String getEjbql() {
>       return "from java.lang.Object o";
>    }
> }
> public class DataModelComponentTest extends SeamTest {
> 	
>    @Test
>    public void test() throws Exception {
>       new FacesRequest() {
>          @Override
>          protected void renderResponse() throws Exception {
>             DataModel model = (DataModel) getValue("#{dataModelComponent.dataModel}");
>             assert model.getWrappedData() != null;
>          }
>       }.run();
>    }
> }
> Because the component is conversation-scoped, a ManagedEntityIdentityInterceptor is attached, which nulls the wrapped List after getDataModel() is called.
> In the referenced forum, Gavin indicated he hadn't decided whether this should be expected behavior or not, and asked for a jira issue.  
> If it is expected behavior (I hope not), I think either EntityQuery should not have a getDataModel() attribute, or it should be documented and/or programmatically enforced that EntityQuerys should not be conversation-scoped.

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