is there a way to recycle a complex java object once the GC has decided it is unreachable
SmartPointer<ObjType> object = pool.getObject(); // hold reference

// ... do stuff with object over time.

object = nullptr; // that is when reference
                  // count goes to 0

SomeReference r = referenceQueue.getReference();

pool.recycle(r.takeBackUnusedObjectFromGC()); // ??????????????????????????