I went though the tutorial of getting started in the data source library
"http://code.google.com/apis/visualization/documentation/dev/dsl_get_started.html"
At step 11 of "Creating a Web Application on Apache Tomcat" of the tutorial I get this
theses sentences
-type Status report
-message /myWebApp/simpleexample
-description The requested resource (/myWebApp/simpleexample) is not available.
thank you,
Maliki