No Resultset for query containing multiple tables

Hi, I am new to Oracle and I have a problem concerning the Oracle datasource/query I am using.
I am using Websphere Application Server v5.1 Test environment, which connects to an Oracle 10g database and a DB2 database.
So basically, I have 2 datasources in my webservice application, one for each database. I have tested both datasources from the admin console of the server and both return no errors. Both datasources are loaded on startup of the application and again, there are no errors.
The problem basically is that I have no resultset elements ( rs.next() is false ) when I have a query that queries multiple tables.
Eg. Case1: Select * From table1
Case2: Select * From table1, table2
Case3: Select * From table1 t1 INNER JOIN table2 t2 on t1.column = t2.column
Case1: Contains resultset
Case2 and Case3: NO resultset
When these queries (case 2 and case3) are run from within the webservice application, there is no resultset; only case1 returns a resultset. However, if I run the same queries above from within Oracle SQL developer, there is a resultset containing the matching records. This problem only happens when using the Oracle datasource; the same problem does not happen for the DB2 datasource.
Basically, I do not have any resultset for a valid query and there aren't any errors as well.
Any ideas as to why this happens?
Thanks for any help.
Edited by: user11220677 on Jun 3, 2009 3:08 AM

Finally got to the bottom of this. Turns out that the problem has nothing to do with the Oracle datasource in the webservice application, as what I have initiially thought.
The cause of the problem seems to be related to an import problem/issue in the Oracle SQL developer. Everytime I open Oracle SQL developer, one table (table2 in my example from previous post) is missing its data, so I import the data using the application's import wizard. Once the import is done, I use SQL developer's query interface to verify the data is there, and there are records returned - which made me think the database table was updated successfully. The problem was, I still do not have results when the query is run from the webservice containing the datasource.
We used another SQL command editor to verify if the said table was really updated in the database and to our surprise, it was still empty (even after the import from Oracle SQL developer). That explains why I am not able to retrieve anything from the webservice.
We just imported the data using another SQL command editor and the issue is now fixed.
Thanks anyway.

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