How to fetch entities by objects value in JPA criteria api query - jpa

Question

I am using JPA with JSF datatable with lazy loading.
Here One car can be owned by many users. So when i logged in to the application i want the cars which is owned by the user logged in(assume it as userId=1).
I have a mapping table "Cars_User" that contains carId and userId columns.
My Entities are like this
My Car Class
#Entity
#Table(name="car")
public class Car implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private String id;
#Transient
private boolean myCar;
#NotNull
#Size(min = 1, max = 50)
public String name;
#OneToMany(cascade = { CascadeType.REFRESH }, fetch = FetchType.LAZY, orphanRemoval = true)
#JoinTable(name = "Cars_User", joinColumns = #JoinColumn(name = "carId"), inverseJoinColumns = #JoinColumn(name = "userId"))
private List<User> carUsers = new ArrayList<User>();
getters ...
setters ...
}
User Class
#Entity(name = "User")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
private String firstName;
private String lastName;
}
I have found one answer for Lists of String collection in this link but how can be achieved in my case.
I wanted to do get all Cars entities in criteria api that contains the logged in user id "userId" in carUsers Lists. can anyone please help?

Answer 1

I found the solution. I have passed the logged in user Object "user" in isMember function. This may help for somebody.
CriteriaBuilder criteriaBuilder = em.getEntityManagerFactory().getCriteriaBuilder();
CriteriaQuery<Car> criteria = criteriaBuilder.createQuery(Car.class);
Root<Car> root = criteria.from(Car.class);
criteria.where(criteriaBuilder.isMember(user, root.get(Car_.carUsers)));
List<Car> cars = em.createQuery(criteria).getResultList();