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AspectWerkz is a dynamic, lightweight and high-performance AOP/AOSD framework for Java. It has been merged with the AspectJ 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[clarify]. Aspects can be defined using either Java annotations (introduced with Java 5), Java 1.3/1.4 custom doclet 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.

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