Q: With Tomcat, when login, I got an error: 
   Unable to compile class for JSP ... package com.websina.bean does not exist

A: This is probably caused by a bug in certain Tomcat versions. It seems that,
   if there is a blank space in the directory path where Tomcat is installed, 
   the jsp compiler cannot find the java classes under the WEB-INF/lib.

   When you install tomcat on windows, the default directory path is 
   C:\Program Files\Apache Group\tomcat_xxx,  you should change it to, 
   C:\tomcat_xxx instead.

   Another possible solution is to move bugzero.jar under bugzero\WEB-INF\lib
   to tomcat's common\lib directory. That also seems solve the problem.