Stored procedure call not working

I have  2 ms-sql update statement through stored procedures
1) as a batch update
if (vendorBillDetailsDTO != null) {
               stmnt =
                    con.prepareCall(
                         "Exec usp_CMP_UpdPRDetails ?, ?, ?, ?");
               Iterator it = vendorBillDetailsDTO.iterator();
               while (it.hasNext()) {
                    VendorBillDetailsDTO myVendorBillBillDetailsDTO =
                         (VendorBillDetailsDTO) it.next();
                    stmnt.setInt(
                         1,
                         myVendorBillBillDetailsDTO.getBillDetailRef().intValue());
                    stmnt.setInt(
                         2,
                         myVendorBillBillDetailsDTO.getBillId().intValue());
                    stmnt.setString(3, myVendorBillBillDetailsDTO.getCRN());
                    stmnt.setInt(
                         4,
                         myVendorBillBillDetailsDTO.getServiceCode().intValue());
                    stmnt.setString(5, myVendorBillBillDetailsDTO.getPRShortText());
                              stmnt.addBatch();
                    //it.next();
               } //while
               stmnt.executeBatch();
          } //if
This  block is working perfectly fine and statement is correctly getting executed
2)     if (vendorBillHeaderDTO != null) {
               stmnt =     con.prepareCall(
                         "Exec usp_CMP_UpdPRHeader ?,?,?");
               stmnt.setInt(1, vendorBillHeaderDTO.getBillId().intValue());
               stmnt.setString(2, vendorBillHeaderDTO.getBillType());
               stmnt.setString(3, vendorBillHeaderDTO.getEstimateReference());
stmnt.executeUpdate();
}//end if
This statement is not getting executed (I have many input parameters like  int , timestamp , long , double etc). It is not throwing any error (Even when I  enclosed it with try catch theere is no exception thrown .)  However in back end record is not getting updated .
Any ideas ? 
Please help
NPB

Well, that could be a problem in the Data Base side, i suggest you:
1) See the log file of your DB,
2) Run in your DB the Store Procedure, maybe you forget put a commit, and see that of this way you can update the table you can.
Try it.
Regards if helps you
Josué Cruz

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