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The choice of the transport layer is determined by the last interceptor in the client proxy, which is referred to as the Invoker Interceptor in Figure 21.1, “The main components in the detached invoker architecture”. The invoker interceptor contains a reference to the transport specific stub of the server side Detached Invoker MBean service. The invoker interceptor also handles the optimization of calls that occur within the same VM as the target MBean. When the invoker interceptor detects that this is the case the call is passed to a call-by-reference invoker that simply passes the invocation along to the target MBean.