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How to rollback Google App Engine transactions on Eclipse

Sometimes, when we are deploying an app to Google App Engine from Eclipse, something goes wrong (connection is lost, process is stuck,...) and the transaction is never completed.

In those cases, when you try to redeploy, you normally get an error message:
Conflict Another transaction by user XXX is already in progress
All you have to do in order to undo the transaction and go back to the initial status is:

1) Open the command line on Windows

2) Navigate to the SDK bin folder on Eclipse. It normally looks something like this:
C:\Program Files\Eclipse\plugins\com.google.appengine.eclipse.sdkbundle_1.8.7\appengine-java-sdk-1.8.7\bin>

3) Type the following command, where the last parameter is the absolute path to the war folder of your GAE's project:
appcfg rollback C:\Users\Arturo\workspace\Dialective\war
4) Use your Google App Engine credentials when requested. And that's it!

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