Problems with maven and appengine archetypes

Hello,
I'm trying to use maven with app engine and guestbook archetypes and
skeleton , as shown in the following link:
https://developers.google.com/appengine/docs/java/tools/maven

In " Building the Guestbook guestbook using Demo - archetype " all right,
but when I modify any section of classes generated when Invoking Build the
project by mvn verify, just misses on lines that I modified .

Running com.marioapp.GuestbookServletTest
Tests run : 1, Failures : 1, Errors : 0, Skipped : 0 , Time elapsed : 0.279
sec <<< FAILURE !
testDoGet ( com.marioapp.GuestbookServletTest ) Time elapsed : 0.204 sec <<<
FAILURE !
junit.framework.ComparisonFailure : expected : < Hello , [ ] test

I'm also Following the " Creating a New Project using Maven - archetype App
Engine skeleton " of the web "
https://developers.google.com/appengine/docs/java/tools/maven " and run the
step 15 shows a message "nothing to compile - all classes are up to date "
so I can not continue .
Of course, before I created several classes and jsp 's, so the project is
not empty .

[INFO ] --- maven -compiler -plugin : 2.5.1 : compile ( default- compile ) @
joderostia ---
[ INFO] Nothing to compile - all classes are up to date

Are any special configuration or intermediate step is Necessary or is there
something I'm not Considering ?

In summary,
I am trying to configure maven and google app engine to access the Adwords
Api.
Took several days researching, but can not find the correct settings.
Any help is welcome.

Thank you very much in advance
Mario