UsingHibernate

FAQ

1. ERROR MESSAGE : Could not perform validation checks for component as the class was not found

• Turns out that if you are going to use a component as a composite key, the component must

1. Override equals

2. Override hashCode

3. Implement java.io.Serializable

1. ERROR MESSAGE : ORA-00904: "ROLEELEMEN0_"."ID": invalid identifier

• The HQL was delete from RoleElement where role.id = :roleId

1. Bulk UPDATE/DELETE cannot include alias

   • NOTE this issue has been fixed in Hibernate 3.1.x

2. Bulk UPDATE/DELETE cannot include join either explicit or implicit.

   • above HQL use implicit join in role.id

   • you can use sub-queries in the where-clause.