Have you signed up to try Google App Engine for Java yet? We were so overwhelmed with the response to our early look at Java support on App Engine that we decided to let more developers in now, without waiting. Thus, we're expanding the early look signups to 25,000 developers, in order to give more of you a chance to try it out. So please sign up, give it a try, and let us know what you think. We've already seen a number of interesting apps built and deployed. Stay tuned for us to point some of the cooler ones out in the coming weeks.
On another note, if you haven't delved down into the SDK and taken a look around, you may have missed the demo directory. Inside this directory you'll find a number of projects which demonstrate various features of Google App Engine for Java. These demos are a great place to start if you want to learn more about App Engine by example, or if you just want to get hacking on something quickly. Last but not least, we hope these demos are of practical value too, as we included example Ant build scripts and organized the code with standard directory layouts and naming conventions.
Looking to create an end-to-end Java AJAX application? Try out Sticky, the sticky note app written using Google Web Toolkit and App Engine. You'll find useful patterns you can use in your own code, the sample source itself is Apache licensed so feel free to use it directly.
Are your eyes set on a mobile app? Check out the source for Task Engine . Also built with GWT, this simple task app is written with the iPhone and Android in mind.
If scaling your infrastructure is more your cup of tea, you can check out the shardedcounter example. It demonstrates how to implement distributed incrementing counters, which are useful for understanding how to scale larger applications on App Engine.
Note: If you installed the App Engine SDK with the Google Plugin for Eclipse, the SDK and accompanying demos can be found in your Eclipse installation directory, under plugins/com.google.appengine.eclipse.sdkbundle_1.2.0.vXXX.
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