Pfthb

I have a Person entity within that entity I have a nested Set of entities for PersonNames. There is a OneToMany relationship between Person and PersonNames in that a person can have a multiple names.

 @XmlElementWrapper(name = "names")
 @XmlElement(name = "name")
 @OneToMany(mappedBy = "person", orphanRemoval = false, fetch = FetchType.EAGER)
 private Set<PersonNames> name;

You can see how the PersonNames set is defined above.

I need to create a JPA Criteria query for finding all Person entities that have a PersonNames object matching on firstName, middleName, or lastName.

public List<Person> getPerson(String lastName, String middleName, String firstName) 
 CriteriaBuilder builder = em.getCriteriaBuilder();
 CriteriaQuery<Person> criteria = builder.createQuery(Person.class);

 Root<Person> root = criteria.from(Person.class);
 criteria.select(root);

 if(!lastName.isEmpty() && lastName != null) 
 Predicate lastNameCondition = builder.equal( root.get(Person_.personId).get(PersonNames_.lastName), lastName);
 criteria.where(lastNameCondition);
 

 TypedQuery<Person> query = em.createQuery(criteria);
 return query.getResultList();

Above is my attempt to accomplish said query, however I get the following error on the ".get(Person_.personId)" part of the Predicate line:

The method get(SingularAttribute) in the type Path is not applicable for the arguments (SingularAttribute)

The predicate line might be completely wrong, but I can't wrap my head on how to accomplish this, and nothing I google seems to turn up any results. Do I need to do an explicit join for this?

Edit: Removed Hibernate tag as I realized it's what our Wildfly server wants to use, but we are not using Hibernate in our code.

Re: "not using Hibernate API in our code" -- it is being deprecated.

CriteriaApi has a few detractors, but regardless, once you get the hang of things it can be approached pretty easily.

@Entity
public class Person {
 @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
 private Long id;

 @OneToMany(mappedBy="person")
 private Set<PersonName> names;

and to populate it:

tx.begin();
Person p = new Person();
PersonName c1 = new PersonName(p, "F1", "M1", "L1"); 
PersonName c2 = new PersonName(p, "F2", "M2", "L2"); 
em.persist(p);
em.persist(c1);
em.persist(c2);
tx.commit();

and to query it

em.clear();
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Person> query = cb.createQuery(Person.class);
Root<Person> person = query.from(Person.class);
Join<Person, PersonName> names = person.join("names");
Predicate findNames = new Predicate[3]; 
findNames[0] = cb.equal(names.get("firstName"), "F1");
findNames[1] = cb.equal(names.get("middleName"), "M1");
findNames[2] = cb.equal(names.get("lastName"), "L1");
query.where(findNames);
List<Person> persons = em.createQuery(query).getResultList();
System.out.println(persons);

Will this work?

Criteria c = s.createCriteria(Person.class);
c.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
c.createAlias("name", "name");
c.add(Restrictions.eq("name.lastName", lastName));
return c.list();