A mediation handler is a Java program that acts as the unit of deployment and administration in mediations. It has mediation parameters that control its behaviour.
A mediation handler is deployed as a stateless session Enterprise Java Bean (EJB). A mediation parameter is a Java bean property of the mediation handler. It allows the mediation handler to be customised as it is added to a mediation handler list. Any mediation parameter not specified when the mediation handler is added to the mediation handler list will be left at its default value. You deploy a mediation handler as an EAR file using the Deploy wizard, and install it into WebSphere Application Server.