Transaction problem with stateless EJB and DAO

Question

Hi,
I'm using a stateless session bean with container managed transaction and I have a method, which updates a row via CMP entity bean and then calls stored procedure, using a DAO object, which has to use the updated data. Both calls must be done in one transaction. The problem is that the stored procedure doesn't see the changes made from the update via CMP EJB, but after the method exits the changes are in the database. I'm using WebSphere 4.0.3 and DB2 7.2. Method code example in the stateless bean:
public doIt(ValueObject vo) throws ... {
OrderPosRemote opr = getOrderPosRemote();
opr.update(vo);
getDAO().recalc(vo);
} catch (DAOException daoex) {
getSessionContext().setRollbackOnly();
And in the DAO:
public boolean recalc(...) throws DAOException {
Connection conn = getConnFromDataSource();
CallableStatement cstmt = conn.prepareCall("call ...(?,?)");
cstmt.execute();
... // close cstmt and release connection to the pool
Any help will be highly appreciated !

Answer 1

Hi meadandale,
this was my first guess too and I set this attribute in the session bean method, then into the update method of the CMP bean and "manually" to the connection object in the DAO like this:
conn.setTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED);
The isolation level is set correctly (IMHO), because when I comment the line above in the DAO, an exception is thrown stating that the isolation level can't be changed within a transaction.
Unfortenully this didn't help too. Should I set some special attribute to the database or connection pool additionally ?
I don't understand what is the problem actually - it is definitely one transaction and why this doesn't work is not very clear to me ...