The EmbeddedId or IdClass annotation is used to denote a composite primary key. How can i use composite primary key without ( EmbeddedId or IdClass ) ?
If it is possible to use composite primary key without ( EmbeddedId or IdClass ) then how can i use EntityManager.find( Entity Class , Object primaryKey) method to find entity in case of composite primary key(Multiple Primarykey) (because of no IdClass or EmbeddedId) .
EclipseLink take List of pk in the find() operation but if composite pk key defined in example -
Entity Person {
@Id
String username;
@Id
String emailId;
@Basic
String firstName;
@Basic
String lastName;
}
List list = new ArrayList();
list.add(${username}); //Run time value
list.add(${emailId}); //Run time value
then EnitityManager.find(list) will take these arguments , is i am right?
If i am assuming correct then how will EnitityManager.find() operation will know that List 1st argument is username or emailId pk value (means sequence of composite pk fields value)