This article briefly introduces Java, provides a bit of Java history, and describes various Javaimplementations. Introduction: What's Java? Sun Microsystems has developed a set of technologies called Java (TM). Using Java you can create various kinds of programs including traditional applications and "applets" that automatically run whena user views a web page. Many users are very attra...

The current trend towards the usage of Java in real-time, supported by two specifications (Real-Time Java and RealTime Core extensions for the Java platform) requires adequate schedulability analysis, and consequently, worst case execution time (WCET) analysis techniques for the Java platform. This paper proposes a framework for providing portable WCET analysis for the Java platform. Portabilit...

Implementing efficient communication and I/O mechanisms in Java requires both fast access to lowlevel system resources (such as network and raw disk interfaces) and direct manipulation of memory regions external to the Java heap (such as communication and I/O buffers). Java native methods are too expensive to perform these operations and raise serious protection concerns. We present Jaguar, a n...

In Java, some memory updates are necessarily visible to some threads but never to others. A definition of Java memory consistency must take this fact into consideration to capture the semantics of non-terminating systems, such as a Java operating system. This paper presents a programmer-centered formal definition of Java memory behavior that captures those semantics. Our definition is employed ...

The Java Virtual Machine (JVM) provides a high degree of platform independence, but being an interpreter, Java has a poor system performance. New compiler techniques and Java processors will gradually improve the performance of Java, but despite these developments, Java is still far from real-time. We propose the Communicating Java Threads (CJT) model, which eliminates several shortcomings, su...

A simple application program interface (API) for Java programs running on a wiki is implemented experimentally. A Java program with the API can be running on a wiki, and the Java program can save its data on the wiki. The Java program consists of PukiWiki, which is a popular wiki in Japan, and a plug-in, which starts up Java programs and classes of Java. A Java applet with default access privil...

Java RMI is the computational model used to develop distributed systems in the Java language. Although widely used in the construction of distributed systems, the use of Java RMI is limited because this middleware does not allow asynchronous method invocations. This paper presents FlexRMI, a Java based system that supports asynchronous invocations of remote methods. FlexRMI is completely implem...

Esterel is a mature reactive language used to specify and implement realtime and time-critical systems. In this article, we investigate its use with Java and describe a Java binding for Esterel. We show that Esterel programs translate and integrate well into Java. The real-time, critical part of the code can be specified with Esterel and verified with a large set of tools, before being turned i...