Question

I’m having a big problem trying to do map an entity to another that has a Composite-PK…
What i’m trying to achieve here is, 1 User can have many Task, and Each Task contains many Modules and It’s Action

| User | (Userid, Name)
| UserRight | (Userid, TaskId)
| Task | (TaskId, ModuleId, ActionId)
| Action | (ActionId, ActionName)
| Module | (ModuleId, ModuleName)

in my User.hbm.xml
<set name="tasklist" table="UserRight" cascade="all">
<key column="user_id" />
<many-to-many column="task_id" unique="true"class="kodi.model.UserRights.Task" />
</set>

and i receive this error

SEVERE: Initial SessionFactory creation failed.org.hibernate.MappingException: Foreign key  (FK8AF2ACF15756F47C:UserRight [task_id])) must have same number of columns as the referenced primary key (task [task_id,submodule_id,action_id])
WARNING: StandardWrapperValve[default]: PWC1406: Servlet.service() for servlet default threw exception
java.lang.ExceptionInInitializerError
    at kodi.gen.util.HibernateUtil.buildSessionFactory(HibernateUtil.java:23)
    at kodi.gen.util.HibernateUtil.<clinit>(HibernateUtil.java:14)
    at kodi.view.LoginAction.<init>(LoginAction.java:22)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at java.lang.Class.newInstance0(Class.java:355)
    at java.lang.Class.newInstance(Class.java:308)

I know the problem is becoz, i’m trying to only use 1 Attribute to map to a set with 3 but i’m really not sure how to solve it.

can anybody please help?

Answer 1

the easiest and best way would be to make taskid unique and map it as id.

If not possible you can try <many-to-many property-ref="TaskId"/> or <many-to-many property-ref="Id"/>