Question about implement the transaction in EJB

Question

Dear Sir
I try to do some transaction work in EJB,I builded 6 bean blow
OrderMgr(session bean) control Order(CMP Entity Bean)
Istock(session bean) control Item(CMP Entity Bean)
DeliveryMgr(session bean) control delivery(CMP Entity Bean)
I try to implement the transaction in session bean OrderMgr Like
public void submitOrder(int id) {
Try
Istock.dosomething
Delivery.dosomething
Bookorder.dosomething
catch (Exception ex) {
sessionContext.setRollbackOnly();
But not Rollback not work
Then I change Session Bean OrderMgr to BMT,write the code blow, but rollback still not work
sessionContext getUserTransaction().beging();
Try{
Istock.dosomething
Delivery.dosomething
Bookorder.dosomething
sessionContext.getUserTransaction().commit();
catch (Exception ex) {
sessionContext. rollback();
Could anyone tellme what's wrong with me code?
　　

Answer 1

If you want to rollback work done by these methods, than you have to make sure that they don't start a new transaction. i.e. they should use tx attribute "required" or "mandatory".
Istock.dosomething
Delivery.dosomething
Bookorder.dosomething