This paper presents a component-based architecture for autonomous repair management in distributed systems and its application to J2EE server clusters, called JADE. The architecture features three major elements: (1) a dynamically configurable, component-based structure that exploits the reflective features of the FRACTAL component model; (2) an explicit and configurable feedback control loop structure, that manifests the relationship between managed system and repair management functions; (3) an original replication structure for the management subsystem itself which makes it fault-tolerant and self-healing

The completely decoupled interaction model oered by the publish/subscribe communication paradigm perfectly suits the interoperability needs of todays large-scale, dynamic, peer-to-peer applications. Unmanaged inter-administrative environments, where these applications are ex- pected to work, pose a series of problems (potentially wide number of partipants, low-reliability of nodes, absence of a centralized authority, etc.) that severely limit the scalability of existing approaches which were originally thought for supporting distributed applications built on the top of static and managed environments. In this paper we propose a novel architecture for implementing the topic-based publish/subscribe paradigm in large scale peer-to-peer systems. The proposed architecture is based on probabilistic mechanisms and peer-to-peer overlay man- agement protocols. It achieves event diusion by implementing trac confinement (published events have a high probability to reach only interested subscribers), high scalability (with respect to several fundamental parameters like number of participants, subscriptions, topics and event publication rate) and fair load distribution (load distribution closely follows the distribution of subscription on nodes).