The javax.servlet.Servlet class should be in the javax.servlet.jar file in the server/all/lib directory. Verify that that file exists.
Also, how did you install JBoss? If you used the installer, what options did you select?
The file exists in the server/all/lib directory
I picked the all server category with the installer and enabled all options. I used the standard settings on the securtiy and the other stuff...
I installed jboss 4.0.4 on a windows xp(64bit) edition.
got Jdk 1.5.0.08 installed
I got the errors solved by reinstalling my jdk's
I probably installed the wrong jdk(32 bit) instead of the jdk for the 64 bit