hi,
from a servlet I start a transaction much like the code below.
this code works beuatifully in the way that i get data inserted/updated
into my database via my entities.
my problem is that my updates will happen from 2 threads, so i am afraid
that my transaction will not commit. for instance i will get this kind
of errors.
"Nested transaction not supported"
so my question really is, how do i make sure this scenario is thread and
transaction safe, ensuring that all transactions commit ok ?
./allan
************************* pseudo code **************************
@PersistenceContext( name = "GFPU", unitName = "GFPU")
public class myServlet extends HttpServlet {
@Resource
UserTransaction _utx;
...
protected void doProcess(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
String pc_jndi = "my_jndi_name";
InitialContext ic = new InitialContext();
Object ot = ic.lookup(pc_jndi);
_em = (EntityManager) ot;
...
...
MyThread instance1 = new AggregatorThread(_utx, _em, 1);
Thread thread1 = new Thread( instance1 );
thread1.start();
MyThread instance2 = new AggregatorThread( _utx, _em, 2);
Thread thread2 = new Thread( instance2 );
thread2.start();