What is the openfire's jsp developing environment

Hello avery one:

I’m reading jsp files in openfire and I don’t know the jsp’s development environment. for example, I can find decorators.xml and sitemesh.xml but

I can’t find where the Sitemesh.jar locate? By the way, I build an openfire project in eclipse3.3 with plugin myeclipse6.0.

It is grateful if someone can give me a hand!