Well I personally would blame ATI for this problem ... write them a mail that you dislike it and they should check wether java is using DirectX and if true, disable AA:

There's really nothing the java-team could do about this, and even for card-manufacturers its not really easy to solve since YOU force all programs to AA.
Since you FORCE them .. what should they do?

This is a short-term fix which disables all the nice advanced hardware-accerlation features of java:
Start your limewire as following:

java -Dsun.java2d.noddraw=true -jar LimeWire.jar

in the Console and the same directory limewire is installed.

lg Clemens