Java.sql.SQLException: Cannot rollback a transactional connection

Question

Hi
This is what i am trying to do:
try{
conn = getConnection();
conn.setAutoCommit(false);
execQuery(sql_1);
execQuery(sql_2);
conn.commit();
}catch(Exception ex){
conn.rollback();
i have made an error in sql_2 so i get an Exception. My queries use the same "conn" so the rollback should applay to the first query but it has made a commit. How do i get rollback to work?
I read this in an other topic:
Make sure that you configure your database connection in the jboss.jcml and not in the bean (or servlet) itself.
Then, make a lookup via jndi. On this way, the driver gets bound to the transactionManager and the rollback() works finde.
But i don�t know how to configure the connections, and how does the trasactionManager work.
Can some one help me?

Answer 1

Maybe i should ad that i am using Oracle db an the
code is in a Entity BeanThis changes the way you want to do rollbacks. Rollbacks in ejbs are handled by the container. In order to do rollbacks, you need to flag the transaction as to be rolled back. To do this, you need to call the method setRollbackOnly() in the ejb's SessionContext - sessionContext.setRollbackOnly();
For this to work correctly, you must declare the method in the ejb's deployment descriptor as requiring to handle transactions by specifying the appropriate value for the <tran-attribute> element of you ejb's dd.
BTW, you'd be better off posting EJB related question in the J2EE SDK forum.