[jboss-user] [EJB 3.0] - relationship does not prevent from deleting referenced entit

[micho]

I thougtht, that the definition of a unidirectional relationship without cascading delet would prevent the Entities from deletion

Example:
unidirectional many-to-many relationship between user and usergroup.
users know their usergroups,
usergroups do not know their users

It shold not be possible to delete a usergroup which is in an relationship to a (or many) user

I coded like this, what have I done wrong?

Thanks Micho

@Entity
  | public class Usergroup implements Serializable
  | {	private long mSid;
  |  	private String mName;
  |   
  |   public BenutzerGruppe()
  |   { super();  }
  |   
  |   @Id @GeneratedValue(strategy=GenerationType.AUTO)
  |   public long getSid()
  |   { return mSid; }
  | 
  |   public void setSid(long sid)
  |   { mSid = sid; }
  | 
  |   public String getName()
  |   { return mName; }
  |   
  |   public void setName(String pName)
  |   { this.mName = pName; }
  | }
  | 
@Entity
  | public class User implements Serializable
  | { private long   mSid; 
  |   private String mName;
  |   private List<Usergroup> mUsergrouplist;
  |   
  |   public User()
  |   { super(); }
  |     
  |   public String getName()
  |   { return mName; }
  |   
  |   public void setName(String pName)
  |   { mName = pName;}
  |   
  |   @Id @GeneratedValue(strategy=GenerationType.AUTO)
  |   public long getSid()
  |   { return mSid; }
  |   
  |   public void setSid(long pSid)
  |   { mSid = pSid; }
  |   
  |   @ManyToMany 
  |   ( targetEntity = Usergroup.class   )
  |   public List<Usergroup> getUsergrouplist()
  |   { return mUsergrouplist;  }
  | 
  |   public void setUsergrouplist(List<Usergroup> pUsergrouplist)
  |   { mBenutzerGruppeListe = pBenutzerGruppeListe; }
  | }
  | 

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