FindBy method naming rules

Question

What are the rules for naming the findBy methods?
I want to find entity Bean by two fields. e.g. Want find entity Bean on orderNumber and customerId field.
I created method like findByOrderNumberAndCustomerId(String orderNumber, String customerId)
It let me generate code and deploy the bean, but at runtime it does not return any entity bean or Collection. It throws exception.
Thanks for your help.
A

Answer 1

There is no problem with your method name, I think if u could post the code, it will be better.
or try using EJB QL for searching as
public Animal findbyId(int Id){
return (Animal) em.createQuery("Select e From Animal e where e.id = :id").setParameter("id",Id).getSingleResult();
}