Problems accessing Cloud SQL from a Java Web App located on a Compute Engine VM instance

Hello

I'm trying to install a simple Java Web App (petclinic from springframework) on a tomcat instance located on a Compute Engine VM instance (on which Cloud SQL is enabled).

This Java Web App need to access to my Cloud SQL instance. 

I downloaded google_sql on my VM instance, called gauth to be authenticated, called google_sql.sh and successfully connected to my Cloud SQL instance from my VM instance.

Unfortunately it still doesn't work, it fails when connecting and I have this error:

 java.sql.SQLException: Unable to load OAuth2 refresh or access token. Please run the google_sql command line tool once to setup cached credentials. See: http://code.google.com/apis/sql/docs/commandline.html

What should I do to be able to access my Cloud SQL instance from a VM Instance ? 

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