Installing API's

Has anyone had any luck installing any alternate API's?
Im tyring to install the JCE API but it doesnt seem to
work. Im my autoexec.bat i have

set CLASSPATH=%CLASSPATH%;C:\jdk1.3\jre\lib\ext\jce1_2_1.jar;C:\jdk1.3\jre\lib\ext\local_policy.jar;C:\j dk1.3\jre\lib\ext\US_export_policy.jar;

When i try to compile ie ......
javac C:\Java\FileEncryptor.java
It seems like it is unable to find the classes that should
be contained within the jce1_2_1.jar file

I scoured through suns site for some installation info but it's like looking for a needle in a hay stack.... It seems other people are having the same problem also

http://forum.java.sun.com/read/16806...0IMf1DfiMAAAAA

Thanks all......