Cannot commit or rollback a JDBC Connection from CAF project

Question

Hi Everybody,
I'm working in CE 7.10. I have a CAF Project that gets a JDBC connection from a Custom Datasource to an external Database.
Here is the code:
  try
    Context ctx = new InitialContext();
    DataSource ds = (DataSource) ctx.lookup("jdbc/MYDATABASE");               
    con = ds.getConnection();
    con.setAutoCommit(false);
    Statement statement = con.createStatement();
    String updateStatement = "UPDATE TABLE...";
    statement.executeUpdate(updateStatement);
    con.commit();
    catch(SQLException sqle){
         con.rollback();
I got the following exception on line "con.setAutoCommit(false);":  --> "Cannot begin JDBC transaction from this connection of "MYDATABASE" DataSource. JTA transaction has already started."
and the following on line "con.commit() / con.rollback()" : --> "Cannot commit JDBC transaction from this connection of "MYDATABASE" DataSource. This resource participates in a JTA transaction."
If I run the same code from a webDynpro or a J2EE project it works ok, but not from a CAF Application Service. I tried to do it in a simple Class in the CAF Project and call this clas from the Application service, but I get the same error.
Any Ideas??
Thanks a lot!
Regards.

Answer 1

Solved with   "SessionContext.setRollbackOnly()" instruccion.
Regards.