NPE in TableAlias.hashCode

[Bogdan Daniliuc <bd...@montran.ro>]

Hi all, 

I'm running into a problem when using OJB rc5. I'm having a class hierarchy
with an abstract class A that holds, among others, a collection of class B
items and a collection of class A items. Class C extends class A. The
repository contains:

<class-descriptor class="A">
	<extent-class class-ref="C"/>
</class-descriptor>

....
<class-descriptor class="C"  table="C">
	...
	<field-descriptor
		name="status"
		column="STATUS"
		jdbc-type="VARCHAR"
	/>
	...
	<!-- A association (parts) -->
	<collection-descriptor
		name="parts"
		proxy="true"
		element-class-ref="A">
		<inverse-foreignkey field-ref="parentId"/>
	</collection-descriptor>
	

	<!-- B association -->
	<collection-descriptor
		name="entries"
		proxy="true"
		element-class-ref="B">
		<inverse-foreignkey field-ref="baseId"/>
	</collection-descriptor>
</class-descriptor>

Class B has no references to other objects. I want to obtain all objects B
whose A correspondent have a certain status. Due to the potential of C
instances being too large, I'm trying to use a ReportQuery to run something like:

	select * from B where baseId in (select id from A where status='XXX')


	....
	Criteria criteria1 = new Criteria();

	criteria1.addEqualTo("status", "XXX");


	ReportQueryByCriteria subQuery = new ReportQueryByCriteria(A.class, 
		   new String[] { "id" },
		   criteria1);


	Criteria criteria2 = new Criteria();
	criteria2.addIn("baseId", subQuery);
	
	QueryByCriteria query = new QueryByCriteria(B.class, criteria2);

	Collection col = broker.findByQuery(query);
	...

The above code results in a NPE in
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement$TableAlias.hashCode.
The only solution I could find is to define a table in repository for class A.

Is this a bug or is the intended behaviour? It seems strange that the abstract
class should be mapped and the search is not done on the extents.

Regards, 

Bogdan

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