To use internationalization context in an Enterprise JavaBeans (EJB) application, the internationalization service must be enabled in the runtime environments for all server-side components (servlets and enterprise beans, including session beans enabled for Web service usage). By default, the service is enabled for client-side components (EJB client applications and Web service clients).
If you do not require the internationalization service, do not enable it. Leaving the service disabled prevents any possible performance degradation incurred by the implicit distribution of internationalization resources.
The internationalization service cannot be enabled for HTTP clients, because support for internationalization in that case is provided by the browser, not by the application server.