Combo Box in Portal Form resets after query

Question

Hello all,
I have a portal form based on Stored Procedure. In it I have a Location combo box and Query button in addition to few text items. Users can select location from the drop down list and hit Query button to view the values in for the text items. The query part is working fine. But after query the Location resets to Null (as the LOV which feeds the combo box can have Null). We would like to keep the location they chose to query up even after the query results. Any help is appreciated.
The Location item is in the parameters of the Stored Procedure. Initially it was IN, later I changed to IN OUT but there is no change in functionality.
I also removed the ability to accept NULL for the LOV which feeds Location Combo box but now it is displaying the first location on the list after the query, which is even worse.
Thanks in advance,
Manohar

Answer 1

You're catching Exceptions in empty catch() blocks. There might have been an exception, but you won't know if the catch block doesn't do anything.
Try something like this:
catch(SQLException e){
    System.err.println( "Problem with db query"+e.getMessage() );
    e.printStackTrace( System.err );
}in order to see what's going wrong with your code.