This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
GAE does not support any and all Java libraries. Check Google's documentation whether you're running into a GAE-specific problem. As you've found out, there's also a security manager present which further limits what you can do (which there isn't generally if you use Tomcat to run your own web apps).
Thank for your reply ulf, I had added a keytool file as it rises the security problem. With this help of code SSL CLIENT FOR JAVA am not getting the security error but when in the SSL CLIENT CODE i have to add a base url in the line this shows me 401 not authorized Exception