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 Example of encyption-decryption using DES  ---------------------------------------------------------- package com.example.des; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import javax.crypto.Cipher; import javax.crypto.CipherInputStream; import javax.crypto.CipherOutputStream; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; public class CipherExample {     public static void main(String[] args) {         try {             String key = "y1$ab??x";            // your key , needs to be at least 8 characters for DES                         FileInputStream fis = new FileInputStream("Ori...

GWT: User Service RPC call failed: 500 The call failed on the server Solution: If you are using objectify then make sure that you have added it's jar file ( objectify-2.2.1.jar ) into WEB-INF/lib as well as you have put this file in classpath (using java build path in case of eclipse) Also don't forget to include: <inherits name="com.googlecode.objectify.Objectify" /> in your project-name.gwt.xml file.

Fishbone: A GWT and Google App Engine Blog: An Objectify example to store data in the Google A... : If you're like me, then you've searched for a complete working example using Objectify with Google App Engine to persist data and utilize th...