AspectWerkz is a dynamic, lightweight and high-performance AOP/AOSD

Aspect-oriented programming

In computing, aspect-oriented programming is a programming paradigm which aims to increase modularity by allowing the separation of cross-cutting concerns...

 framework for Java

Java (programming language)

Java is a programming language originally developed by James Gosling at Sun Microsystems and released in 1995 as a core component of Sun Microsystems' Java platform. The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities...

. It has been merged with the AspectJ

AspectJ

AspectJ is an aspect-oriented extension created at PARC for the Java programming language. It is available in Eclipse Foundation open-source projects, both stand-alone and integrated into Eclipse. AspectJ has become the widely-used de-facto standard for AOP by emphasizing simplicity and usability...

project, which supports AspectWerkz functionality since AspectJ 5.

Unlike AspectJ prior to version 5, AspectWerkz did not add any new language constructs to Java, but instead supported declaration of aspects within Java annotations. It utilizes bytecode modification to weave classes at project build-time, class load time, as well as runtime. It uses standardized JVM level APIs. Aspects can be defined using either Java 5 annotations, Java 1.3/1.4 custom doclets or a simple XML definition file.

AspectWerkz provides an API to use the very same aspects for proxies, hence providing a transparent experience, allowing a smooth transition for users familiar with proxies.

AspectWerkz is Free Software. The LGPL-style license allows the use of AspectWerkz 2.0 in both commercial and open source projects.