[jboss-user] [EJB 3.0] - Re: Working example por OneToMany cascade remove?

[waynebaylor]

here's an example i just tested:

  | @Entity
  | public class Parent
  | {
  |     @Id
  |     @GeneratedValue
  |     private Long id;
  |     
  |     @OneToMany(mappedBy="parent", cascade=CascadeType.REMOVE)
  |     private Set<Child> children = new HashSet<Child>();
  | 
  |     public Set<Child> getChildren()
  |     {
  |         return children;
  |     }
  | 
  |     public void setChildren(Set<Child> children)
  |     {
  |         this.children=children;
  |     }
  | 
  |     public Long getId()
  |     {
  |         return id;
  |     }
  | }
  | ==========================
  | 
  | 
  | @Entity
  | public class Child
  | {
  |     @Id
  |     @GeneratedValue
  |     private Long id;
  |     
  |     @ManyToOne
  |     private Parent parent;
  |     
  |     private String name;
  | 
  |     public Child(){}
  |     
  |     public Child(String name)
  |     {
  |         this.name = name;
  |     }
  |  ...
  | }
  | 

and here is the code that creates and removes the entities:
@Stateless
  | @Local(TesterLocal.class)
  | @LocalBinding(jndiBinding="session.Tester/local")
  | public class Tester implements TesterLocal
  | {
  |     @PersistenceContext(unitName="PU2")
  |     private EntityManager em;
  |     
  |     public void doWork()
  |     {
  |         Parent p = new Parent();
  |         em.persist(p);
  |         
  |         for(int i=0; i<5; ++i)
  |         {
  |             Child c = new Child("child-"+i);
  |             c.setParent(p);
  |             p.getChildren().add(c);
  |             
  |             em.persist(c);
  |         }
  |         em.flush();
  |         p = null;
  |         
  |         Parent pp = em.find(Parent.class, 1L);  //i know the id is 1
  |         em.remove(pp);
  |         em.flush();
  |     }
  | }

this code does not throw any exceptions. checking the DB i can see that the parent and all children are removed.

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