With these modifications, a user can configure a tomcat instance with web applications and web services by writing a service, such as:
...
services = {
  tomcat = {
    enable = true;
    webapps = [ mypkgs.HelloWorldWebApplication ];
    axis2 = {
      enable = true;
      services = [ mypkgs.HelloService mypkgs.HelloWorldService ];
    };
  };
};
svn path=/nixos/trunk/; revision=16619