java - NonUniqueObjectException on saving joined tables -

I have two related tables in a many to many relationship: Role and allow . The join table is RolePermission .

role is a list of permission to object. It looks like:

  Private set & lt; Permission & gt; Permissions; @ManyToMany (speed = FetchType.EAGER, cascade = {CascadeType.ALL}) @JoinTable (name = "permission_role", joinColumns = @JoinColumn (name = "ROLE_ID"), inverseJoinColumns = @JoinColumn (name = "permission_id")) Public set & lt; ObjectPermission & gt; GetObjectPermissions () {Return Object Submissions; .}  

Adding a certain time I want to add permissions for a role:

  role.getObjectPermissions () (permission); RoleDAO.saveOrUpdate (role);  

Both roles and permissions are already present in DB, each in its table to add a record to the connection table, that will indicate both the role and the permissions:

  role.addObjectEntryPermissionRole (permission); RoleDAO.saveOrUpdate (role);  

The problem is that it seems that this permission is trying to save themselves! Then throws this error:

  org.hibernate.NonUniqueObjectException: A different object with the same identifier value was already connected to the session: [com.XXX.model.Permission # 11]  

Can anyone tell me what is the problem? what I have done?

I had the same problem, remove cascade = {CascadeType.ALL} Having solved this issue