The aspectpath enables aspects from a JAR file or an output directory to be weaved into a project and the results output to the normal location.
Using the aspectpath means that you can write your aspects in a different project and also means that they can be re-used across multiple projects. You may wish to build an aspect library, using the outjar setting or another method. Alternatively you can simply add the output directory of your aspect-containing project to the aspectpath.
To setup your AspectJ project to use the aspectpath:
Launching a program with an aspectpath
Using linked source folders
Using the inpath
Adding an outjar
Adding an aspectpath