First, the general strategy is to make them so simple that they don't need much testing - let them delegate most of the work to plain simple
java classes and test those extensively.
Second, you will find some material on those issues on both the articels and extensions sections at
www.junit.org. You can also take a look at
http://c2.com/cgi/wiki?ServletTesting - using the FindPage might give you other interesting pages.
And last but not least, you could get yourself a copy of
http://www.amazon.com/exec/obidos/tg/detail/-/1558608680/
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus