		    Google App Engine for Java SDK
		   =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

What is Google App Engine?
--------------------------

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.


Contents
--------

This bundle contains the following:

  docs/                       - Documentation
  docs/javadoc                  - Javadoc for the App Engine API's

  bin/                        - Executable Tools
  bin/appcfg                    - Deploys Java apps to Google
  bin/dev_appserver             - Launches the development server

  lib/user/                     - API's we provide to you to build your 
                                  application. They should be bundled with your
                                  webapp (in WEB-INF/lib).
  lib/shared/                   - API's intrinsic to App Engine such as the
                                  Servlet and JSP libraries. You must not 
                                  bundle these with your webapp.
  
  config/                     - Configuration files
  config/sdk                    - Configuration files for the SDK tools
  config/user                   - Configuration files for your applications
    
  demos/                      - Sample applications


Dependencies
------------
- Java 1.5

Writing an Application
----------------------
  
Google App Engine for Java web applications are based on the Java
Servlet API.  This means that you will want to provide classes that
extend either the javax.servlet.GenericServlet or
javax.servlet.http.HttpServlet classes.  You will also need to supply
a web.xml file that specifies these servlet classes, and a URL pattern
for each.

For a web application to be compatible with App Engine, it should look like this:

  WEB-INF/web.xml               - Servlet deployment descriptor
  WEB-INF/appengine-web.xml     - Custom (AE-specific) deployment descriptor
  WEB-INF/datastore-indexes.xml - (optional) list of datastore indexes to
                                  build for your application.
  WEB-INF/lib/appengine-api.jar - Include this to access App Engine API's
                                - One or more of:
  WEB-INF/classes/...           -   Class files required by your app
  WEB-INF/lib/*.jar             -   Other Jar files required by your app
  WEB-INF/lib/*.zip             -   Other Zip files required by your app
  ...                           - Any static resources for your application

Running the Local Runtime Environment
-------------------------------------

All executable scripts live in the bin directory of the SDK. Windows scripts
have a ".cmd" extension, Unix and MacOSX scripts end with ".sh". The commands
below assume you're running them from the root directory of the SDK. 

To run the local development server use:
    bin\dev_appserver.cmd <your web application>
    
It will begin listening on port 8080 on the local machine.

Many of the sample applications have Ant build.xml targets that start
the local runtime environment.

Uploading your App to Google
----------------------------

1) Go to http://appengine.google.com and create your application.

2) Make sure that the application identifier in your appengine-web.xml file
   matches the one you chose in step 1.

3) Run appcfg to upload your application to deploy your application to
   Google's Servers:

   From the appengine-java-sdk directory, run:
     bin\appcfg.cmd update <your web application>

4) Try your application out at:  http://<app-id>.appspot.com
