We'll need a little more information to help us investigate. What kind of application you are building? When do you see this error - during building locally in your IDE, during deployment time, etc.? With JCS, you have a complete application server in the cloud. You don't need to deploy/install one. You just deploy your application to the Java Cloud Service. So the reference to Tomcat is a bit confusing. Can you explain the use of Tomcat in this scenario?