Dynamic adaptability of applications to their execution evironment is growingly important in mobile, WAN-based and distributed embedded systems. In this paper, we present MolèNE, an object-oriented middleware framework enabling the construction of dynamically adaptable mobile applications, coping with temporary memory restrictions, variations in network bandwith, etc. We then come back on MolèNE to compare it with other similar systems, in order to draw lessons towards reflective middleware and system designers.