Transactional WebService, non-XA problem

Question

I have build a transactional web service and it is working fine on if the client and service are on same domain. If they are not am getting the following error:
Exception thrown from bean; nested exception is: Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2.1 (Build b60e-fcs (12/23/2008))): oracle.toplink.essentials.exceptions.DatabaseException Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: java.lang.IllegalStateException: cannot add non-XA Resource to global JTS transaction. Error Code: 0.
This is my service
@WebService()
@Stateless()
@TransactionManagement(TransactionManagementType.CONTAINER)
public class EJBService {
@PersistenceContext(unitName="EJBServicePU")
private EntityManager em;
@WebMethod(action="AddDiscount")
@TransactionAttribute(REQUIRED)
public void addDiscount(@WebParam(name = "discountCode") String discountCode,@WebParam(name = "rate") double rate)
DiscountCode code = new DiscountCode(discountCode.charAt(0));
code.setRate(BigDecimal.valueOf(rate));
em.persist(code);
@WebMethod(action="UpdateDiscount")
@TransactionAttribute(REQUIRED)
public void UpdateDiscount(@WebParam(name = "discountCode") String discountCode,@WebParam(name = "rate") double rate)
DiscountCode code = (DiscountCode) em.find(DiscountCode.class, discountCode.charAt(0));
code.setRate(BigDecimal.valueOf(rate));
em.merge(code);
}And this is my client code
EJBService port = service.getEJBServicePort();
try
//out.println("Initial number: " +port.getBalance());+
+transac.begin();+
+port.addDiscount("B", 10);+
+port.addDiscount("S", 44);+
+transac.commit();+
+}catch(Exception e)+
+{+
+out.println("An error occured, transaction abortedd.<br/>"+ e.getMessage());
} I am connecting to derby database and using the sample database. I have checked the sample code for WSIT many times and I didnt know what is the problem here.
Please Help.
Thank you.

Answer 1

xxxxx wrote:
we create 2 pools, both the pools are created but the problem occurs when you start
some transaction.
Here there is an EJB transaction and this throws a known exception of weblogic
that
"java.sql.SQLException: Connection has already been created in this tx context
for pool named <first pool's name>. Illegal attempt to create connection from
another pool: <second pool's name>"
we want to use more then one non xa drivers and use weblogic connection pools
at the same time.. any help is appreciated.Hi. this is an EJB/transactional integrity issue. If you get non-XA connections,
then the transaction coordinator will collude with the JTS driver to ensure that
any given transaction can only really use one JDBC connection, so we can guarantee
the commit or rollback will be atomic. Without 2PC, we would otherwise have to commit
on both connections. If the first succeeded, and the second commit failed, we
could not recover.
If you really need to talk to multiple DBMSes, or even just one DBMS but as
different users, then there is a way, with some risks you will have to accept.
You can connect to any DBMS at any time if you use a non-TX datasource.
This will give you a 'raw' pooled connection, whith the transaction coordinator
knows nothing about. You can use this as you wish, but be very sure to close this
connection in a finally block, else it will never get back into the pool. ALso note
that any work you do on this connection is in your hands. If the EJB tx rolls back
we won't do anything with this connection, so if there's any update you did, it's
totally up to you to undo them, or respond in whatever way you need to in error
conditions.
Joe