// Persist A-B as unowned
UnownedJDOOneToManyBiSideA a = new UnownedJDOOneToManyBiSideA();
a.setName("Side A");
UnownedJDOOneToManyBiSideB b = new UnownedJDOOneToManyBiSideB();
b.setName("Side B");
a.addOther(b);
b.setRelated(a);
pm.makePersistent(a);
Object aId = pm.getObjectId(a);