[jboss-dev-forums] [EJB3 Development] - EntityManager.remove() throws java.lang.IllegalArgumentException: Removing a detached instance ?

[Joseph Hwang]

Joseph Hwang [http://community.jboss.org/people/aupres] created the discussion

"EntityManager.remove() throws java.lang.IllegalArgumentException: Removing a detached instance ?"

To view the discussion, visit: http://community.jboss.org/message/592898#592898

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@Stateless
public class LoginSession implements ILoginSession {

@PersistenceContext(unitName="MyHome")
EntityManager em;
....
public Object loginFunc(Class clazz, Object primaryKey) {
  // TODO Auto-generated method stub
  return em.find(clazz, primaryKey);
}

public Object removeFunc(Serializable entity) {
  // TODO Auto-generated method stub
  em.remove(entity);
  return entity;
}

.....
}

bean codes are like above.

in JSP file

ILoginSession login = ctx.lookup(LoginSession/remote);
Members erase = (Members)login.loginFunc(Members.class,"father");
out.println(erase.toString()); // It works to this lines
login.removeFunc(erase); // but this line thows Exception

EntityManager.remove() fuction throws "java.lang.IllegalArgumentException: Removing a detached instance"

I need your advice..

Best Regards....^_^
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