title: Can I add classes to sun's rt.jar file?
body: <p>I downloaded the Javax.mail package. I have jdk1.6.0_11.
  Problem is...I cannot get javac or java to find those classes!
  I can get apps to compile using JCreator LE ( by adding the mail jar
  to its search list ) but, when I try to run the app in a command window,
  it fails.</p>
  
  <p>Can I add these new classes to the rt.jar without 
  hurting my jdk installation? 
  I know java has it wired up to look there for classes.
  (And, the mail classes are inside a javax package - seems like 
  they could reasonably be added to the javax folder in rt.jar..</p>
  
  <p>Thanks!
  Phil D'</p>