Trying to understand PersistenceContextType.EXTENDED

Question

Hello,
I'm trying to understand the PersistenceContextType.EXTENDED setting. It is my understanding that when I put this in my class, it means that the container managed transaction will span multiple method calls.
I have a stateful bean:
@Stateful(name = "StatefulContainerSessionEJB")
public class StatefulContainerSessionEJBBean implements StatefulContainerSessionEJB, StatefulContainerSessionEJBLocal {
@PersistenceContext(unitName = "Model",
type = PersistenceContextType.EXTENDED)
private EntityManager em;
// implied REQUIRED transaction
public void createAddress() {
try {
// create a new address
Address addr = new Address();
//... set addr fields
System.out.println("Persist addr at: " + addr.getStreet());
em.persist(addr);
System.out.println("Persist of addr complete");
} catch (Exception ex) {
ex.printStackTrace();
// transaction should still be alive here
@Remove // this is what causes the transaction to end
public void cancelTransaction() {
System.out.println("Transaction rolledback");
em.getTransaction().setRollbackOnly();
And in my main code I have:
StatefulContainerSessionEJB statefulContainerSessionEJB;
public String createAddressThruStateful() {
System.out.println("Create Address Thru Stateful Button hit....");
try {
final Context context = getInitialContext();
statefulContainerSessionEJB = (StatefulContainerSessionEJB)context.lookup("StatefulContainerSessionEJB");
statefulContainerSessionEJB.createAddress();
} catch (Exception ex) {
ex.printStackTrace();
return null;
public String cancelPartTimeTransaction() {
System.out.println("Cancel Address Thru Stateful Button hit....");
try {
statefulContainerSessionEJB.cancelTransaction();
} catch (Exception ex) {
ex.printStackTrace();
return null;
First question is: am I using the Stateful bean correctly in main? i.e. its a class level variable and get instantiated in the createAddressThruStateful call.
My second question is: when I run this code, my address get commited to the DB at the end of the createAddress() call. I didn't expect this to happen.
Please straigten me out.
Thanks,
Chris

Answer 1

please tell me what the inout in this coode means:A parameter that supplies input as well as accepts output is an INOUT parameter.