Thanks for the fast answers,
yea the problem was somewhere else.. I tried the same setup on my other machine and it runs very well.
For people how wanna know these were my 5 steps to get it work.
1.) copy the JBoss_6.0.0-M5\server\default\deployers\jboss-aop-jboss5.deployer\pluggable-instrumentor.jar
to JBoss_6.0.0-M5\bin
2.) setting loadtimeweaving at JBoss_6.0.0-M5\server\default\conf\bootstrap\aop.xml to true
<property name="enableLoadtimeWeaving">true</property>
3.) put your jboss-aop.xml to JBoss_6.0.0-M5\server\default\deploy\
4.) put your aspect class in your webproject
5.) don't forget to add the -javaagent:pluggable-instrumentor.jar to the runntime if you use eclipse you find this
on Server View under Open launch configuration