Hi,
I would like to know how to use existing ejb3 entity beans in seam as a seam
component? Lets assume the following scenario:
I have a simple ejb3 package deployed in JBoss, which provides a persistent
context (unitName = "openep") and a simple entity bean named User. Lets call
this package PACKAGE_A.
The User entity in PACKAGE_A has no @Name and @Scope annotations, so it is not
a seam component. For the User entity in PACKAGE_A I don't want to have any
dependencies to seam. It is just a plain entity bean.
In a second package (PACKAGE_B), which is actually a seam application packaged
as an ear, I want to use the existing entity bean from PACKAGE_A as a seam
component. My application in PACKAGE_B is basically equivalent to the seam
registration example except that I want to use my existing User entity from
PACKAGE_A.
My naive approach to make this existing User entity a seam component was to
create a SeamUser class, which extends the existing User entity from PACKAGE_A.
| @Name("user")
| @Scope(SESSION)
| public class SeamUser extends User {
|
| private static final long serialVersionUID = -6805341268455291354L;
|
| }
|
My registration action in PACKAGE_B looks like this:
| @Stateless
| @Name("register")
| public class RegisterAction implements Register {
|
| @In
| @Valid
| private SeamUser user;
|
| @PersistenceContext(unitName = "openep")
| private EntityManager em;
|
| @IfInvalid(outcome = Outcome.REDISPLAY)
| public String register() {
| em.persist(user);
| return "success";
| }
|
| }
|
The deployment of PACKAGE_B works but when I try to register a new user I will
get a
| javax.ejb.EJBException: java.lang.IllegalArgumentException: Unknown
entity: com.openep.registration.SeamUser
|
exception when calling em.persist(user). I tried to cast SeamUser to User but
this leads to the same exception.
| ...
| em.persist((User)user);
| ...
|
The following code works and does exacly what I want, but I like to know if
there is a more elegant way to do it?
| @Stateless
| @Name("register")
| public class RegisterAction implements Register {
|
| @In
| @Valid
| private SeamUser user;
|
| @PersistenceContext(unitName = "openep")
| private EntityManager em;
|
| @IfInvalid(outcome = Outcome.REDISPLAY)
| public String register() {
| User myUser = new User(user.getUsername(), user.getPassword());
| em.persist(myUser);
| return "success";
| }
|
| }
|
I hope that someone can give me a hint.
Best regards, René
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