/**
     * @hibernate.set cascade="all-delete-orphan" lazy="false"
     * @hibernate.collection-key column="task"
     * @hibernate.collection-one-to-many class="com.objects.TaskNotification"
     */
     public  Set getNotifications() {
         return  notifications;
    }

<set
            role="notifications"
            lazy="false"
            readonly="false"
            cascade="all-delete-orphan"
            sort="unsorted"
        >

            <key
                column="task"
            >
            </key>

            <one-to-many
                   class ="com.objects.TaskNotification"
            />

        </set>

<set
                name="notifications"
                lazy="false"
                cascade="all-delete-orphan"
                sort="unsorted"
                >

            <key
                    column="task"
                    >
            </key>

            <one-to-many
                     class ="com.objects.TaskNotification"
                    />

        </set>