private static AuthenticationException newNoCredentialsException(final AccessDeniedException denied) {
        return new BadCredentialsException("No credentials found in the request", denied);
    }
Wraps the given {@link AccessDeniedException} in an {@link AuthenticationException} to reflect, that no
authentication was originally present in the request.

@param denied The caught exception.
@return The newly created {@link AuthenticationException}.
grpc-server-spring-boot-starter/src/main/java/net/devh/boot/grpc/server/security/interceptors/DefaultAuthenticatingServerInterceptor.java