This paper addresses the issue of improving the performance of memory management for real-time Java applications, building upon the real-time speci®cation for Java (RTSJ) from the Real-Time Java Expert Group. In a ®rst step, a collecting dynamic memory solution including both a real-time garbage collector and region-based memory management, is proposed. A thorough analysis of the parameters in¯uencing the performance of write barriers in memory management, together with ways of improvement are then presented. Finally, the implementation of a memory management solution compliant with the RTSJ and integrating the proposed improvements is sketched.

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Java is a programming language with features not found in traditional languages such as platform independence and dynamic loading. Because of this, Java is extending and beginning to be used in many new environments. In particular, the advantages that Java provides make it a good candidate for distributed, real-time and embedded systems. However, Java presents some problems regarding its use in embedded and real-time environments. In this paper, we examine the state-of-the-art in the development of embedded realtime systems using Java. We analyze the limits that the Java language and its execution environment present to develop real-time and embedded systems, and we present current research in this area aimed at solving these limits.

The use of wireless Pdas is foreseen to outrun the one of Pcs in the near future. However, for this to actually happen, adequate software environments must be devised in order to allow the execution of various types of applications. This paper introduces the base features of such a n e n vironment, which is a customizable Jvm-based middleware. In particular, the middleware platform embeds services for appropriate resource management and for supporting novel Pda-oriented applications.