4.0.0 com.google.appengine appengine 1.2.1 appengine-java-sdk zip Google App Engine for Java SDK Google App Engine is a web application hosting platform that allows you to write your web application in one of several programming languages (including Python and Java). This SDK includes everything necessary to develop Java applications that can be hosted by App Engine. This includes a jar file and documentation for the current set of App Engine-specific API's, and a development environment that can be used to test your application before deploying.