How do I catch the constraint violation exception from EclipseLink?

Question

I am using EclipseLink in my web application, and I am having a hard time gracefully catching and handling Exceptions it generates. I see from this thread what seems to be a si

Answer 1

I use this.

if (!ejbGuardia.findByPkCompuestaSiExiste(bean.getSipreTmpGuardiaPK())) {
    ejbGuardia.persist(bean);
    showMessage(ConstantesUtil.MENSAJE_RESPUESTA_CORRECTA, SEVERITY_INFO);
} else {
    showMessage("Excel : El registro ya existe. (" + bean.toString() + ")  ", SEVERITY_ERROR);
}

and my function from above:

public boolean findByPkCompuestaSiExiste(Object clasePkHija) throws ClassNotFoundException {
    if (null != em.find(this.clazz, clasePkHija)) {
        return true;
    }
    return false;
}

With that I dont need to program a validation for each Persist, its common in the my DAO Classes.