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  @Match("*")
  public static void adviseNonNull(MethodAdviceReceiver receiver)
  {
    MethodAdvice advice = new MethodAdvice()
    {
      void advise(InvocationMethodInvocation invocation)
      {
        invocation.proceed();

        if (invocation.getResultType().equals(String.class) && invocation.getResult() == null)
          invocation.overrideResult("");
      }
    };

    receiver.adviseAllMethods(advice);
  };

  @Match("*")
  public static void adviseNonNull(MethodAdviceReceiver receiver)
  {
    MethodAdvice advice = new MethodAdvice()
    {
      void advise(InvocationMethodInvocation invocation)
      {
        invocation.proceed();

        if (invocation.getResult().equals(null))
          invocation.overrideResult("");
      }
    };

    for (Method m : receiver.getServiceInterface().getMethods())
    {
      if (m.getReturnType().equals(String.class))
        receiver.adviseMethod(m, advice);
    }
  };