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Hans Ahlfeldt - One of the best experts on this subject based on the ideXlab platform.

Leili Lind - One of the best experts on this subject based on the ideXlab platform.

Erik Sundvall - One of the best experts on this subject based on the ideXlab platform.

Martin Schoeberl - One of the best experts on this subject based on the ideXlab platform.

  • proceedings of the 7th international workshop on Java technologies for real time and embedded systems
    Java Technologies for Real-time and Embedded Systems, 2009
    Co-Authors: Teresa M Higueratoledano, Martin Schoeberl
    Abstract:

    Over 90 percent of all microprocessors are now used for real-time and embedded applications, and the behavior of many of these applications is constrained by the physical world. Higher-level programming languages and middleware are needed to robustly and productively design, implement, compose, integrate, validate, and enforce real-time constraints along with conventional functional requirements and reusable components. It is essential that the production of real-time embedded systems can take advantage of languages, tools, and methods that enable higher software productivity. The Java programming language has become an attractive choice because of its safety, productivity, its relatively low maintenance costs, and the availability of well trained developers. Although it features good software engineering characteristics, standard Java is unsuitable for developing real-time embedded systems, mainly due to under-specification of thread scheduling and the presence of garbage collection. These problems are addressed by the Real-Time Specification for Java (RTSJ). The intent of this specification is to enable the development of real-time applications by providing several additions, such as extending the Java memory model and stronger semantics in thread scheduling. Interest in real-time Java in both the research community and industry has recently increased significantly, because of its challenges and its potential impact on the development of embedded and real-time applications. The goal of the proposed workshop is to gather researchers working on real-time and embedded Java to identify the challenging problems that still need to be solved in order to assure the success of real-time Java as a Technology, and to report results and experiences gained by researchers. This year the following two topics are of special interest: • Open source solutions • Multiprocessor and distributed real-time Java Open source software and hardware solutions have received growing attention in recent years; major vendors of Java Technology have adopted the open source development model for some of their products. Open source development benefits from distributed peer review and transparency and enables easy verification of published results. Access to the source code also stimulates building upon prior work, as it allows to reuse tested and reviewed components. Nowadays, real-time systems demand more functionality than in previous years. Consequently the execution platforms are often multiprocessors or distributed systems. Although the Real- Time Specification for Java has addressed some multiprocessor issues, other issues are still outstanding. Furthermore, defining the appropriate RTSJ abstractions for distributed real-time programming is still an open topic.

  • Java Technology in an fpga
    Lecture Notes in Computer Science, 2004
    Co-Authors: Martin Schoeberl
    Abstract:

    The application of Field Programmable Gate Arrays (FPGA) has moved from simple glue logic to complete systems. The potential for FPGA use in embedded systems is steadily increasing continuously opening up new application areas. Low cost FPGA devices are available in logic densities where the CPU with necessary peripheral device can be integrated in a single device. Java, with its pragmatic approach to object orientation and enhancements over C, got very popular for desktop and server application development. Some features of Java, such as thread support in the language, could greatly simplify development of embedded systems. However, due to resource constraints in embedded systems, the common implementations of the Java Virtual Machine (JVM), as interpreter or just-in-time compiler, are not practical. This paper describes an alternative approach: JOP (a Java Optimized Processor) is a hardware implementation of the JVM with short and predictable execution time of most byte-codes. JOP is implemented as a configurable soft core in an FPGA. With JOP it is possible to develop applications in pure Java on resource constraint devices.

Nosrat Shahsavar - One of the best experts on this subject based on the ideXlab platform.