New challenging deployment scenarios are ac-commodating portable devices with limited and heterogeneous capabilities that roam among wireless ac-cess localities during service provisioning with session continuity requirements, such as in multimedia stream-ing. The paper proposes an original two-level buffering strategy to maintain streaming continuity independently of client roaming at provision time. In par-ticular, it focuses on a specific component of the proposed support infrastructure, i.e., the pure Java buffering component, which has shown to outperform the standard Java Media Framework in both streaming initialization time and imposed overhead.