How can I retrieve the foreign key from a JPA ManyToOne mapping without hitting the target table?

Question

I have the following two annotated classes that I use to build a graph:

@Entity
@Table(name = \"Edge\")
public class Edge
{
    /* some code omitted for brev         


        

Answer 1

How about using getReference()?

For example:

Node fkNode = em.getReference(edge.getNodeFrom()); // [1]
fkNode.getId()

[1] This will not trigger a SQL query to retrieve the nodeFrom