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find an entity using a class Id

M.A.Bell
1#
M.A.Bell Published in 2017-12-07 08:22:16Z

To find an object from entity with primary key we use em.find(Person.class, <Id>).

I'm using JPA EclipseLink and I have a Person entity wich has a composite primary key(@classId),

the Person entity:

@Entity
    @IdClass(PersonId.class)
    public class Person {

@Id
private int id;

@Id
private String name;

public String getName() {
    return name;
}

// getters & setters
}

and PersonID:

public class PersonId implements Serializable {

private static final long idVersionUID = 343L;

private int id;
private String name;

// must have a default construcot
public PersonId() {

}

public PersonId(int id, String name) {
    this.id = id;
    this.name = name;
}

//getters & setters
//hachCode & equals
}

How to use em.find to get a specified Person object?

M.A.Bell
2#
M.A.Bell Reply to 2017-12-07 08:22:16Z
PersonId carId = new PersonId(33, "Jhon");

Person persistedPerson = em.find(Person.class, carId);

System.out.println(persistedPerson.getID() + " - " + persistedPerson.getName());
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