Why JBoss AOP over AspectJ?
- 100% pure Java
- annotation support (JDK 1.5 and 1.4)
- Metadata and annotation override facility
- load-time transformations (instead of compile time)
- hotdeployment of aspects (dynamic AOP)
- per-instance API (dynamic AOP)
- dynamic CFLOW
- pluggable pointcuts
- extended pointcut expressions (has and hasfield as well as typedefs).

I haven't looked at AspectWerkz since February, but they had limited support in their 
pointcut expression language at the time (no around for field interception, no 
constructor interception, no annotation support).  They did have better load-time 
transformation support, but we will catch up on this soon.

Bill



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