| Re: [eclipselink-users] Problems Mapping Map |
Also you could create an association object to model the many-to-many join table. See: http://en.wikibooks.org/wiki/Java_Persistence/ManyToMany#Mapping_a_Join_Table_with_Additional_Columns Gordon Yorke-2 wrote: > > Ok, l thought you were attempting to map pre-existing tables not > generate them. What you are seeing when you use Hibernate is a > Hibernate specific extension supporting Entities as Map keys when > there is no relation between the Map value and Map key. This is not > supported in the JPA 1.0 specification. > EclipseLink will support this type of relationship if there is a > relationship between class1 and class2 and you use the @MapKey > annotation like: > > @Entity > public class Class2 { > @Id > protected int id; > protected String name; > @OneToOne > protected Class1 class1; > > public class Class3 { > @Id > protected int id; > protected String name; > @MapKey(name="class1") > @ManyToMany > protected Map<Class1, Class2> class2; > > --Gordon > > ----- --- http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland http://www.eclipse.org/eclipselink/ EclipseLink , http://www.oracle.com/technology/products/ias/toplink/ TopLink Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink , http://wiki.oracle.com/page/TopLink TopLink Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink , http://www.nabble.com/EclipseLink-f26430.html EclipseLink Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence -- View this message in context: http://www.nabble.com/Problems-Mapping-Map-tp16485097p16537433.html Sent from the EclipseLink - Users mailing list archive at Nabble.com.