Error messages for Struts validation

I've got a question that I don't think is possible, but I want to make sure!

I have a form field that has a maxlength dependent on other options.  I have written my own validator to check that the length is valid - ( dependent on these other options) , and that works just fine.

Now to take it one step further, it would be ideal if I could have the error message that I have stored from ApplicationResources.properties  be chosen depending on these other options....

So instead of having a generic message: "The length is invalid" or something like that, it could actually say what the length required is.  I can't use the actual maxlength validator that does this, because of the way the fields are being used by multiple name codes.  

So is there a way to choose a different error message from within the validator class, or is it only possible to have one error message per validator, as entered in the validator-rules.xml?

Thanks!
Matt
CluniacAsked:
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TimYatesCommented:
If you write your own ActionForm class, and override the validate() method, then you can pass whatever message you want out of ApplicationResources.properties...

http://publib.boulder.ibm.com/infocenter/wsphelp/index.jsp?topic=/com.ibm.etools.struts.doc/html/rstruse0004.htm

has an example of a validate method

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