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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]

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 [...]

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 [...]

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 [...]

If you are developing web application on Google App Engine for Java. And you dont know what this exception is. You can be in trouble. The container throws this exception for those requests which take time more than 30 seconds. In other words GAE wants every requests to be fullfilled within 30 seconds. Case I [...]

When I came to know that Sun is giving away the opportunity to sign up for newly launched SCJP i.e. Sun Java Programmer Plus certification. I registered for it. According to them Selected candidates will be given the opportunity to appear in beta test for free. But still they have this announcement on their website. [...]

I was reading about collection framework of Java. And was studying Hashtable, HashMap and HashSet. Its quite interesting to know the differences between them. In this post I will discuss these three with examples. Hashtable Hashtable is basically a datastructure to retain values of key-value pair. It didn’t allow null for both key and value. [...]

Sun Microsystems has unleashed Java Store at store.java.com. The purpose of this store is to give opportunities to developers to make money by showcasing their Java applications. Which they care about and develop in their own time. Currently store is in beta and available for US residents only. Sun chief executive Jonathan Schwartz and Java [...]