In EJB development guide, chapter 7.5. Use a Client Interceptor in an Application, the section Insert the Interceptor Programmatically is outdated - this API is no longer available in EJB client for EAP 7.1 (in 7.0 it works).

The developer now needs to do something like this this:

EJBClientContext ctxWithInterceptors = EJBClientContext.getCurrent().withAddedInterceptors(clientInterceptor);

To create an EJBClientContext with the interceptor registered. Then there are basically two options.

First option is to run some code with this EJBClientContext applied using a Callable - EJB calls performed within the Callable will apply the client-side interceptors:

ctxWithInterceptors.runCallable(() -> {
    // perform the calls which should use the interceptor
})

Second option is to mark the newly created EJBClientContext as the new default:

EJBClientContext.getContextManager().setThreadDefault(ctxWithInterceptors);