Performance, Best Practice

[solsticepan.pneuburger.neuburger-edv.de]

Hi,

i have a (simple) question about Performance and Best Practice with Seam.

is this example Code a good Programming Style (and also with EJB)

Example Code:

A Session Bean generated from Seam, a little modified..

@Name("userHome")
@Scope(ScopeType.SESSION)
public class UserHome extends EntityHome<User> {
   @Override
    public void create() {
        super.create();
    }
    
    @Override
    @Factory("userH")
    public User getInstance() {
         return super.getInstance();
    }
    
    @Override
    public String persist() {
         return super.persist();
    }
}

Then I have another Bean, a Stateless ONE

@Name("userActionBean")
@Scope(ScopeType.STATELESS) //STATLESS
public class LinkActionBean {


        @In
     private EntityManager entityManager ;
     
     @In(required = false)
     private UserHome userHome ; 
     
        /** Generated from Seam, extends the EntityQuery Interface
     @In(required = false )
     private UserList userList ; 

      
        //now i have my business Operations
        public String saveUser() {
          //get the values from presentation view
          User user = createNewUserFactory() ; 
          user.setPassword(getInstance().getPassword() ) ;
          user.setUsername(getInstance().getUsername() ) ;
          //and so on....
          entityManager .persist(user) ; 
         return "persist"; //this one is for navigation, if persist then redirect to another view
       }


       //get the instance from user, when he changed his Address and so on
       public User getInstance() {
          return userHome.getInstance() ; 
       }


      //create a new user if Admin creates one
      public User createNewUserFactory() {
        return new User() ; 
      }

My Question: Is it correct to call a Session Bean from a Stateless Bean (or Scope) for some Business Operations ?? Performance, Best Practice and so on...??
If not can you explain me why should may I avoid this ?

I read the Book Seam Manning in Action, but the Examples in this Book don´t answer this Question, or I missed that.

Thanks Peter