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Just read cheat sheets (Refcard) by Dzone on Cloud Computing and Google App Engine for Java. They contain a very jumped to the point and quick reference on these things. You can read to have a quick overview. Read them here: Cloud Computing Google App Engine for Java [ad#co-2]

010110 You see todays date. OK, lets format it. 01/01/10 The combination of 0s and 1s. So lets call the first day of 2010 is a binary friendly day. If we calculate the decimal of this binary we get 22. And we know binary has base 2. Add these digits divide them with binary base and again [...]

Recently I got two books on Google App Engine for Java. Programming Google App Engine by Oreilly and Beginning Google App Engine by Apress. There is less material and comprehensive online tutorials available on this. So its better that you read book on it. I started reading Oreilly’s book. I completed some of the basic [...]

Today I had delivered a workshop on Developing Java Web Applications In Google App Engine. This workshop was the part of events of 3rd International Conference on Open Source Systems and Technologies. It was organized by Al-Khawarizmi Institute of Computer Science , University of Engineering and Technology, Lahore. I have presented following slides there. Also [...]

This project will create and delete an entity record. I have chosen JPA for datastore in app engine. You can also look JDO for this purpose. But my choice to go for JPA is due to Sun standardization on it. I am using App Engine SDK version 1.2.18 Project name: engineplay URL: http://engineplay.appspot.com [ad#co-2] Project [...]

Some of you might have noticed that Pakzilla.com was down for a day. It was due to some technical maintenance and upgrade on hosting severs. I want to apologize for inconvenience. I hope you will not mind. I will continue looking after these issues to make this site available for 24/7. Thanks; Admin, Pakzilla.com

I was getting following exception while trying to code my first interaction with JPA in Google App Engine. After some searching I came to know that I should upgrade my App Engine SDK. To get datanucleus-enhancer-1.1.4.jar. But when I upgraded my SDK from 1.2.0 to 1.2.8. I got following exception. I got two problems to [...]

If you are working on developing some application on Google App Engine. You may come up with such situation to switch your production code with your local dev code. Following is my solution for this problem. I have initialized a servlet from web.xml. That set appropriate value in a static boolean. I will use this [...]

If you want to develop a Twitter app. You need to register your application with Twitter. That means you should have your production URL ready before you think to start your development. When you finished with registration, you will receive consumer key and consumer secret. These unique credentials will help your app to interact with [...]

Today I designed the home page of my company, Concidel. Behind the scene I am working on a Twitter application. Which will be the first product of Concidel. InshAllah after accomplishing that Twitter app I have an idea to develop an app for Posterous. And I also have a Facebook app idea too. Before some [...]