messageSource.addMessage("foo", Locale.getDefault(), "bar");
messageSource.addMessage("bar", Locale.getDefault(), "{0}");
context = new DefaultMessageContext(messageSource);
SpringELExpressionParser parser = new SpringELExpressionParser(new SpelExpressionParser());
DefaultMessageCodesResolver resolver = new DefaultMessageCodesResolver();
errors = new MessageContextErrors(context, "object", new Object(), parser, resolver, null);
}