Michael Yuan

One Response to “JBoss Seam: Coming to an App Server Near You”

1. Nadenka Lara Says:
   May 20th, 2008 at 7:57 am

   Hello Michael,

   first of all… i love seam! i have a problem, sadly, i got some troubles.

   i have created a project (ear) with the seam eclipse plugin. I got 4 projects test, ejb, war and the aer containing references to the ejb and war modules. everything ok… after that i created an ejb project where i want to hoard the model/entities, added a reference to this project in the ear application.xml and referenced this project from the ejb project.
   The problem is, that seam does not recognize the managed entity beans so i must use things like that:
   

   @Name("authenticator")
   public @Stateless class AuthenticatorBean implements Authenticator {
   @Logger Log log;

   @In Identity identity;

   @EJB UserFacade userFacade;

   public boolean authenticate() {
   log.info("authenticating #0", identity.getUsername());
   //write your authentication logic here,
   //return true if the authentication was
   //successful, false otherwise
   //TODO: Login Module entwickeln (Factory-Pattern) damit man unterschiedliche Login Arten unterstützen kann
   User user = userFacade.findUserByCredentials(identity.getUsername(), identity.getPassword());

   if(user == null) {
   return false;
   }

   // (needed but don't want to use this) //Contexts.getSessionContext().set("user", user);

   for(Membership m: user.getMemberships()) {
identity.addRole(m.getRole().getRolename());
}
return true;
}
}


   The Entity:
   
@Entity
@Table(name="USER")
@Name("user")
public class User extends AbstractOrganizationUnit {
/**
*
*/
private static final long serialVersionUID = 1L;
@NotNull
@Column(name="USR_NAME")
@Min(8)
private String username;
@NotNull
@Column(name="USR_PWD")
@Min(8)
private String password;
@CollectionOfElements
@JoinTable(name="USER_MEMBERSHIP",
joinColumns=@JoinColumn(name="USR_ID")
)
private Set memberships;

   /**
   *
   */
   public User() {}

   public String getUsername() {
   return username;
   }

   public void setUsername(String username) {
   this.username = username;
   }

   public String getPassword() {
   return password;
   }

   public void setPassword(String password) {
   this.password = password;
   }

   public Set getMemberships() {
   return memberships;
   }

   public void setMemberships(Set memberships) {
   this.memberships = memberships;
   }

   /**
   * @param membership
   * @return
   */
   public boolean addMembership(Membership membership) {
   return this.getMemberships().add(membership);
   }

   /**
   * @param membership
   * @return
   */
   public boolean removeMembership(Membership membership) {
   return this.getMemberships().remove(membership);
   }

   }


   The Facede/Action Bean:
   
@Name("userFacade")
public @Stateless class UserFacadeBean implements UserFacade {

   @PersistenceContext
   private EntityManager em;

   @Logger
   private Log log;

   public User findUserByCredentials(String username, String password) {
log.debug("findUserByCredentials() called!");
try {
return (User)em.createQuery("from User where username=:username and password=:password")
.setParameter("username", username)
.setParameter("password", password)
.getSingleResult();
} catch (RuntimeException e) {
log.error("#0 ocurred.", e.getClass().getSimpleName());
return null;
}
}
}


   The other beans in the projects created by the plugin are recognized and also showed in the “Seam Components View”.

   Could you help me?

   Thanx in advance,

   nadenka

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