I get "method RsaEncrypt3DES in class MainApplet threw exception java.lang.NullPointerException: null".
This means your JAVA has error.
Debug your own java.
Comment on Re: Problem about NullPointerException when using Inline::Java and Jar file
However the function of demo page MainApplet.html worked. So I think the problem should be the method of Inline::Java which I used to glue Java code inside Jar file between my POST_iCRYPT.pm.