Transaction & non-EJB objects (helper)

Question

hi i have a question about transactional behavior of non-EJB objects. i'm
          using
          weblogic 6.0 sp1 with ejb 2.0.
          say i have a session bean which starts a container managed transaction. and
          it calls
          out to helper class A(non-EJB), and that helper class A get a connection and
          update
          some tables. after A returns, session bean calls helper class B(non-EJB) in
          the
          same transaction. B is supposed to update some other tables but it throw an
          user
          exception. would the transaction in the session bean be rolled back? would
          it
          also roll back the changes made by helper class A?
          thanks for any help,
          z
          

Answer 1

Thanks Rob!
          "Rob Woollen" <[email protected]> wrote in message
          news:[email protected]...
          > Ziqiang Xu wrote:
          >
          > > hi i have a question about transactional behavior of non-EJB objects.
          i'm
          > > using
          > > weblogic 6.0 sp1 with ejb 2.0.
          > >
          > > say i have a session bean which starts a container managed transaction.
          and
          > > it calls
          > > out to helper class A(non-EJB), and that helper class A get a connection
          and
          > > update
          > > some tables.
          >
          > You must get the JDBC connection from a TxDataSource.
          >
          > > after A returns, session bean calls helper class B(non-EJB) in
          > > the
          > > same transaction. B is supposed to update some other tables but it
          throw an
          > > user
          > > exception. would the transaction in the session bean be rolled back?
          >
          > Merely throwing an exception from a helper class will not rollback the
          > transaction.
          >
          > Within an EJB, the best way to rollback a tx is to use the
          > EJBContext.setRollbackOnly method.
          >
          > So you could do something like this:
          >
          > session_bean_method() {
          >
          > try {
          > B.foo();
          > } catch (MyException e) {
          > ctx.setRollbackOnly();
          > throw e;
          > }
          >
          > }
          >
          > > would
          > > it
          > > also roll back the changes made by helper class A?
          > >
          >
          > If they are all within a single transaction, then yes. As I mentioned
          before,
          > make sure that you use a TxDataSource for all of your JDBC Connections.
          >
          > -- Rob
          >
          > >
          > > thanks for any help,
          > >
          > > z
          >