Message Title

When creating joins on an entity via an embeddable using string attribute names, the join creation from the embeddable fails with an exception:

@Entity class User {
  @Id @GeneratedValue Long id;
  @Embedded Finances finances = new Finances();
}

@Embeddable class Finances {
  @OneToOne Account selectedAccount;
}

@Entity class Account {
  @Id @GeneratedValue Long id;
}

CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<Object> query = builder.createQuery();

Root<User> root = query.from(User.class);

root.join("finances").join("selectedAmount"); // throws java.lang.ClassCastException: org.hibernate.jpa.internal.metamodel.SingularAttributeImpl cannot be cast to javax.persistence.metamodel.ManagedType
root.join(User_.finances).join(Finances_.selectedAccount); // works

I've created a reproducing example here. Just run mvn clean test on the project and see the test method using the metamodel succeed and the one using simple string names fail with above-documented exception.