Java support in Google-App-Engine

Google has recently added the long awaiting support for java in their Google-App-Engine. Previously, there was support for only python apps. Now you can easily deploy your java web-apps in the App Engine.

These are the main features added for Java (as described by Google):

• A complete Java 6 runtime environment ( in a secure sandbox environment)
  
• Based on common Java web technology standards, including servlets and WARs, JDO and JPA, java.net, JavaMail and JCache
  
• Datastore Java API for storing and retrieving data. It provides robust scalable data storage for your web application.
  
• The Memcache Java API. It is a distributed in-memory data cache in front of robust persistent storage for some tasks.
  
• The Images Java API. For manipulating images.
  
• The Google Accounts Java API. App Engine applications can authenticate users with Google Accounts.
  
• Supports other languages that compile to the JVM or use JVM-based interpreters, such as JRuby, JavaScript (Rhino), and Scala
  
• A plugin for the Eclipse IDE makes project creation, testing and deployment a snap. This plug-in is a bonus for GWT developers. It has reduced lots of manual works of configuration during deployment and compilation.