[GWT] Table with pagination and one sortable column

I just added a very basic GWT project to my github account to display a table with pagination and one sortable column.
The code is mostly based on the official GWT tutorial :

I basically just added the SimplePage element to handle pagination :

SimplePager pager = new SimplePager();

Source :
Demo :

How to rollback a transaction in GAE

This has nothing to do with JPA.
I was trying to deploy a GWT webapp to GAE when I suddenly got an error.
As a remedy, i got the message :
"java.io.IOException: Error posting to URL: https://appengine.google.com/api/appversion/create?app_id=tableaupagination&version=2&
409 Conflict
Another transaction by user xxxxx is already in progress for this app and major version. That user can undo the transaction with appcfg.py's "rollback" command."

After digging into Google a bit, I found that the way to launch that rollback command under Windows is the following :
1) Figure out where the Google App Engine Java SDK directory is.
In my case, it’s under the Eclipse plugins directory :

The bin folder contains the appcfg.cmd command.

2) Under a DOS command prompt, go to the workspace folder of your project and launch the following command :
"D:\Dev\eclipse-jee-helios-SR1-win32\plugins\com.google.appengine.eclipse.sdkbundle.1.4.2_1.4.2.v201102111811\appengine-java-sdk-1.4.2\bin\appcfg" rollback war

After that, you can try to deploy the app again and it should work.

Links :

I am not a GAE virgin anymore

Well, I do not have much spare time to take a deep look at all the new technologies that come around but i always try to check at least the minimum.

Google App Engine offers a nice tutorial : http://code.google.com/appengine/docs/java/gettingstarted/

I did not run into any major problem.

The result is a very basic and classic guestbook application.

Building and uploading the web application from Eclipse to the App Engine is a piece of cake. You must first receive a code on your phone in order to create an application ID :


You can see it here :  http://celfertest.appspot.com/

I am looking forward for more fun with GAE in the near future, when I have the time.