5. If an entity bean A has been removed from a relationship with bean B, in which case(s) will bean A's accessor method for bean B return a non-null value?
ANswer is - Many to Many
The answer tells you to refer to Spec 132. 10.3.4.2 Cascade-delete
The cascade-delete deployment descriptor element is contained within the ejb-relationship- role element. The cascade-delete element can only be specified for an ejb-relationship- role element contained in an ejb-relation element if the other ejb-relationship-role element in the same ejb-relation element specifies a multiplicity of One. The cascade-delete option cannot be specified for a many-to-many relationship. The deletion of one entity object can only be cascaded to cause the deletion of other entity objects if the first entity object is in a one-to-one or one-to-many relationship with those other entity objects.
If an entity is deleted, and the cascade-delete deployment descriptor element is specified for a related entity bean, then the removal is cascaded to cause the removal of the related entity object or objects. As with the remove operation, the removal triggered by the cascade-delete option causes the container to invoke the ejbRemove() method on the entity bean instance that is to be removed before the persistent representation of that entity object is removed. Once an entity has been removed from a relationship because of a cascaded delete, the accessor methods for any relationships to the entity will reflect this removal. An accessor method for a one-to-one or many-to-one relationship to the entity will return null; and an accessor method for a many-to-many relationship to the entity will return a collection from which the entity object has been removed. After removing the entity object from all relationships and removing its persistent representation, the Container must then cascade the removal to all entity beans with which the entity had been previously been in container-managed relationships for which the cascade-delete option was specified.
My question is, If cascade delete can not be specified for Many-to-Many relationship, how is the answer for this question Many -toMany