holder.setInitParameter("processors", "merge");
holder.setInitParameter("includes", "**/*.js");
existsContext.addServlet(holder, "/existing/test.js");
final HandlerCollection hc = new HandlerCollection();
hc.addHandler(cssContext);
hc.addHandler(jsContext);
hc.addHandler(existsContext);
jetty = new Server(65000);
jetty.setHandler(hc);