UuidRoot1 r1 = Cayenne.objectForPK(context, UuidRoot1.class, 1);
assertEquals("E1:1", r1.getUuid());
E1 e1 = context.newObject(E1.class);
ReferenceableHandler refHandler = new ReferenceableHandler(context
.getEntityResolver());
UuidRelationshipHandler handler = new UuidRelationshipHandler(refHandler);
handler.relate(r1, e1);
assertSame(e1, r1.readPropertyDirectly("cay:related:uuid"));