How you can tell JPA to utilize a area of the simple class because the persistence value?

Think about this class:

@Entity
class Bar {
    @Id
    private long id;
    private FooId fooId;
    /* ... */
}

Where Foo is essentially just:

class FooId {
    private String id;
    /* ... */
}

I (obviously) obtain the error that "Fundamental characteristics are only able to constitute the next types: ...".

It is possible to method to tell JPA (or EclipseLink) to deal with my fooId area in Bar like a String?

The main reason I am with a couple "wrapper" type rather than an ordinary String is the fact that I wish to enforce a little of type-safety during my APIs.

E. g. getAllFooWithBaz(FooId fooId, BazId bazId) rather than getAllFooWithBaz(String fooId, String bazId).

Or it is possible to better way to accomplish this?

java database jpa orm persistence

This can be a common requirement. Do this:

@Entity
class Bar {
    @EmbeddedId
    private FooId fooId;
    /* ... */
}

and:

@Embeddable
class FooId {
    private String id;
    /* ... */
}

or (underlying database schema and `FooId` stay the same):

@Entity
@IdClass(FooId.class)
class Bar {
    @Id
    private String fooId;
    /* ... */
}

or (underlying database schema and FooId stay the same):

Related

or (underlying database schema and `FooId` stay the same):