When I compile my project in eclipse indigo using JDK 7, I get the following error dialog
I hit this problem in Juno, but resolved it by installing the latest 4.2 version from the 4.2 update site here:
http://www.eclipse.org/ajdt/downloads/
That's the same one @VonC gave a year ago -- but since the updated AspectJ is there now (but not in the latest Juno repository nor with what is shipped with Spring), it now constitutes an answer.
But credit to @VonC.
Note that this should work for 3.8 as well as 4.2.