This is a nice comparison of Java obfistication tools, I used it in
obfisticating a desktop software.

http://www.cs.auckland.ac.nz/~cthombor/Students/hlai/hongying.pdf

<http://www.cs.auckland.ac.nz/%7Ecthombor/Students/hlai/hongying.pdf>

If the link is broken, googling by the title will get the report to you.