Java 7 is looking to improve support for dynamic languages using the Java Virtual Machine for their runtime environment. John Rose has been leading a project to explore some options, and JSR 292 will standardise some of this work for Java 7. InfoQ takes a look at the problems JSR 292 solves, and talks to JRuby lead Charles Nutter to find out more about InvokeDynamic in practice.
Memory barriers, or fences, are a set of processor instructions used to apply ordering limitations on memory operations. This article explains the impact memory barriers have on the determinism of multi-threaded programs. We'll look at how memory barriers relate to JVM concurrency constructs such as volatile, synchronized and atomic conditionals.
This article describes "the hardest topic in OSGi, how to deal with service dynamics," based on personal experience. Two factors, concurrency and direct service references, make the problem "fiendishly hard." An import and an export policy should form a comprehensive doctrine for dealing with service dynamics and the article explores two export policies with their corresponding doctrines.
Smalltalk, a language that has had a big influence on Ruby, is making a comeback. We take a look at the current situation and talk to Randal L. Schwartz about Smalltalk. 5
Cloud services have helped bring virtualization to the forefront. Its full power however, also includes other benefits such as high availability, disaster recovery, and rapid provisioning. 1
One of the most exciting things in Java right now is the work being done to get other programming languages onto the JVM. If you want to try something very different from Java, Lisp is a great option. 12
Jeroen Borgers examines if biased locking, lock coarsening, lock elision by escape analysis and adaptive spin locking techniques in the latest JVMs actually work in highly-concurrent apps. 3
Jeroen Borgers examines if biased locking, lock coarsening, lock elision by escape analysis and adaptive spin locking techniques in the latest JVMs actually work in highly-concurrent apps. 16
Simon Ritter explains the vision and capabilities of the Real-Time Java specification (RTSJ), which will bring guaranteed response times regardless of GC. 3
Finding performance bottlenecks can be a difficult task and it can get more difficult as our applications grow in size. The Box is a methodology tool that focuses us efforts to improve performance. 6
Orion Letizi goes in-depth on OpenTerracotta, an open-source JVM-level clustering solution that can cluster single-jvm apps with no code changes. 10
Using both the JVM and the CLR inside the same operating system process is a relatively trivial matter, since any process is capable of loading just about any shared library. Ted Neward shows how. 2