Environment: Tomcat 5.5 + Seam 2.1.0 + Microcontainer, Seam-managed
transactions and PCs.
UserBean.java - displays a list of existing User records, allowing user to
select one (a-la "clickable lists" example) and edit it, or to create a new
record:
@Name ("userBean")
| @Scope (ScopeType.CONVERSATION)
| @Transactional
| public class UserBean extends EntityController {
| @DataModelSelection
| @Out (required = false)
| private User selectedUser;
| @DataModel
| private List<User> users;
|
| public void addUser() {
| selectedUser = new User();
| }
| public void cancelEdit() {
| selectedUser = null;
| }
| @Factory ("users")
| @Begin (flushMode = FlushModeType.MANUAL)
| public void createRecords() {
| users = createQuery("SELECT u FROM User u").getResultList();
| }
| public void saveUser() {
| // getEntityManager().joinTransaction();
| persist(selectedUser);
| flush();
| addFacesMessage("User #{selectedUser.username} succesfully
saved");
| createRecords();
| }
| public void selectUser() {
| }
| }
|
When executing saveUser(), if selectedUser is a transient (new) instance, the
flush() call throws a "javax.persistence.TransactionRequiredException: no
transaction is in progress". If the first line is uncommented, the save
completes successfully (verified in DB). When selectedUser is a managed
(existing) instance, the updates complete successfully whether the first line
is commented or not.
Is this a bug? Am I using the bean in a correct way?
Thanks,
Alex
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