Criteria Update/Delete - The easy way to implement bulk operations with JPA2.1 (http://www.thoughts-on-java.org/2013/10/criteria-updatedelete-easy-way-to.html)

delete.java

@Stateless
@LocalBean
public class OrderManagement {
    @PersistenceContext
    private EntityManager em;
 
    ...
 
    public void deleteOrder(Double amount) {
        CriteriaBuilder cb = this.em.getCriteriaBuilder();

        // create delete
        CriteriaDelete<Order> delete = cb.
         createCriteriaDelete(Order.class);

        // set the root class
        Root e = delete.from(Order.class);

        // set where clause
        delete.where(cb.lessThanOrEqualTo(e.get("amount"), amount));

        // perform update
        this.em.createQuery(delete).executeUpdate();
    }
}

update.java

@Stateless
@LocalBean
public class OrderManagement {
    @PersistenceContext
    private EntityManager em;

    ...

    public void updateOrder(Double oldAmount, Double newAmount) {
        CriteriaBuilder cb = this.em.getCriteriaBuilder();

        // create update
        CriteriaUpdate<Order> update = cb.
        createCriteriaUpdate(Order.class);

        // set the root class
        Root e = update.from(Order.class);

        // set update and where clause
        update.set("amount", newAmount);
        update.where(cb.greaterThanOrEqualTo(e.get("amount"), oldAmount));

        // perform update
        this.em.createQuery(update).executeUpdate();
    }

    ...
 
}