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The GWT Guestbook is a sample application demonstrating how to create and deploy an application built with GWT on Google App Engine Java Runtime. The Guestbook uses GWT RPC to store and retrieve guestbook entries and presents a simple UI to display and enter new guest entries.
This sample application is intended for developers who would like to have a reference implementation to quickly get started with GWT and the Google App Engine Java Runtime SDK. For a tutorial on how to create a full-featured GWT application and deploying it on the Google App Engine Java Runtime, check out the StockWatcher tutorial on the GWT website at the link below:
http://code.google.com/webtoolkit/tutorials/1.6/index.html
To be able to compile and run the GWT Guestbook sample application, you will need to download the tools and libraries listed below in addition to the Google App Engine Java Runtime SDK.
The Ant build tool is required to compile the GWT Guestbook sample application as well as startup the Hosted Mode browser. Once downloaded and extracted, you should configure Ant as prescribed on the homepage (e.g. set an ANT_HOME environment variable and add the Ant distribution binaries to the system path variable.
The GWT libraries are required in order to resolve the usage of the GWT widgets and RPC subsystem in the Guestbook sample application. See the Getting Started guide on the GWT homepage for a better understanding on how to configure a GWT application. For the Guestbook sample application, all you need to do is extract the GWT distribution to your local drive and define the following properties in the Guestbook build.properties file:
Extracted GWT distribution location: gwt.home=<path_to_gwt_sdk>
App Engine SDK home: appengine.sdk.home=<path_to_app_engine_sdk>
*NOTE: If you are using the Google Eclipse plug-in, you can skip downloading GWT since it should come bundled with the plug-in itself. You can also create run configurations in the Eclipse plug-in to compile and run the Guestbook application in hosted mode, so you can skip the configuration steps for the build.properties file as well.
Once you're done with the setup instructions above, you can simply run the command below while in the Guestbook project root directory:
ant hosted
You can compile the Guestbook sample application by running the command below while in the Guestbook project root directory:
The GWT compiler will have generated a set of HTML and JavaScript files and will also have copied over public resources like the Guestbook.css file to a WAR style output directory. You can then upload your application following the instructions described in the Google App Engine Java Runtime SDK documentation:
http://code.google.com/appengine/docs/java/gettingstarted/uploading.html
There are some GWT client-side and standard server-side unit tests that have been created to test the application. You must first compile these unit test classes before you can run them. You can compile them by invoking the following from command-line:
ant javac-tests
Once you've compiled the unit tests, you can run the GWT client-side tests by running the following command while in the Guestbook project root directory:
ant gwttest -Dtest=com.google.gwt.sample.gwtguestbook.client.GuestbookTest
To run regular server-side tests, you can use the following Ant command:
ant servertest -Dtest=com.google.gwt.sample.gwtguestbook.server.GuestServiceTest
The GWT Guestbook demo also demonstrates how namespaces may be used to create "namespaced" instances of the application. Namespaces allows a single application instance to be used for multiple clients. The NamespaceFilter class contains a servlet filter that may be configured for different namespace partitioning strategies.
