Web proxy script in java or jsp

Web proxy script in java or jsp

Long story short, I want to integrate web proxy in my website.
After much reading, I stumble upon http://www.glype.com/ , but the problem
is they only provide PHP version.
My website is using java and jsp language, so I hope to have the script
written in these two languages.
While it's possible for me to write it myself, I really don't want to
reinvent the wheel, especially with thousands of web proxy out there.