[resteasy] Doubt about request, exception

1 - How can I get the Exception message from my server? in my server(spring boot restController) I return one message when Exception with this code: @ResponseStatus(HttpStatus.NOT_FOUND) public class UsuarioNotFoundException extends RuntimeException{ public UsuarioNotFoundException(String email) { super("Usuário não encontrado: " + email + ", Favor verificar o email ou a senha informados"); } } So how can I get this custom error message with RestEasy client?