What the he** is wrong with this code?

I have 2 tables. Primary table "resease" and secondary table (containing the foreign key) "kunden".
Selecting a release (dropdownlist), will show you the corresponding entry of kunden (datatable).
I added buttons to the datatable for deleting certain rows. This all works fine so far.
But as you are going to delte the last entry of table kunden, I want to delte the corresponding entry of the table release as well. And by trying to do so, I get an exception telling in line "dataTable1Model.commit();"
"java.sql.SQLException: Lock time out; try later."
The exception disappears by deleting the inner try-catch block.
So what is wrong with this code?
PS: If you need the database-schema or anything else, let me know....
public String delete_action() {
        try {
         //returns -1, so I can't use it     
            int rowCount = dataTable1Model.getRowCount();          
         //get affected row     
            com.sun.jsfcl.data.DataCache.Row row =
            try {
                //New RowSet for getting FK of affected line
                JdbcRowSetXImpl pkRowSet = new JdbcRowSetXImpl();
                pkRowSet.setCommand("SELECT fk_idrelease FROM kunden " +
                "where fk_idrelease = ?");
                //Convert Row into string
                String myRow = row.toString();
                //Getting the index of the first "=" (it's before the FK)
                int index = myRow.indexOf("=")+1;
                //Getting the number (FK) out of the string an casting it to int
                int fk = Integer.parseInt(myRow.substring(index,(index+1)));
                //Saving the FK in SessionBean1, so I can use it a parameter of
          //the setObject(int, Object)-method
                //this will give me a RowSet of all lines containing the FK of
          //the affected row
          pkRowSet.setObject(1, getSessionBean1().getFk());
                int numRow = pkRowSet.getRow();
          //If the numRow (numbers of rows) is 1, go to cascade_delte
          //and delte the entry with primary key as well
                if (numRow == 1) {
                    cascade_delete(); //not implemented yet
            }catch (Exception ex) {
                error("Error counting affected rows: " + ex);
            info("Deleting row OK!");
        }catch (Exception e) {
            log("Page 1: Row delete exception: ", e);
            error("Error during deleting: " + e);
        } // end try catch
      return null;

just a guess - perhaps call pkRowSet.close() at the end of your try/catch?

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              kPSActionReferenceSuite, kPSActionReferenceSuiteVersion, (void **)&sPSActionReference,
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                                                                                    const void* data )// the message
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              PIActionReference reference = NULL;
              PIActionDescriptor result = NULL;
              SPErr error = kSPNoError;
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                        error = sPSActionReference->PutClass(reference,classLayer);
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                        error = sPSActionControl->Play(&result,eventMake,descriptor,plugInDialogSilent);
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                        if (descriptor != NULL) sPSActionDescriptor->Free(descriptor);
                        if (reference != NULL) sPSActionReference->Free(reference);
                        return error;
    //end make new layer//
    //start paste//
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    SPErr error = kSPNoError;
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    return error;
    //end paste//
    // all windows plug-ins need a DllMain
    #ifdef __PIWin__
    BOOL APIENTRY DllMain( HANDLE hModule,
                                                              DWORD ul_rearson_for_call,
                                                              LPVOID lpReserved )
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    You seem to be missing something inside here. Probably Copy();MakeLayer();Paste();
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                        // the one and only message
                        if (sSPBasic->IsEqual((char*)selector, kPSDoIt))

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