Error Message Codes for Validator

Im just trying to implement my first SimpleForm with Validation. Almost working but in my Validator Im adding code of the form:

Code:

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errors.rejectValue("description",null,"This value cannot be left blank");
errors.rejectValue("description","ERR1","This value cannot be left blank");

---

This error code doesnt map to anything and although ive provided a default message it doesnt like it

Code:

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org.springframework.context.NoSuchMessageException: No message found under code 'null.DataItem.description' for locale 'en_GB'.

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Whilst I think having error codes is an excellant idea I cant quite see what I am meant to do to set them up do I creates a MessageCoderesolver or something.
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I had the same problem. If you supply an empty message.properties file, and set a messageSource, it should go away.

I put this in the application context.

Code:

---

        <!-- Message source for this context, loaded from localized "messages_xx" files -->
        <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
                <property name="basename"><value>messages</value></property>
        </bean>

---

And then put a file called messages.properties in the classpath.

Thanks, that works

Could some point me to how to do this properly now