I have found out some more information about my problem...

The JSF element that is being validated by the validator, is located in a tag 
file from a tag library that I have written.
The tag file is referring to: value="#{searchInfo.fullText}"

"searchInfo" is actually a parameter that is passed to the tag file from the 
underlying page. It seems to be this reference to "searchInfo" that is causing 
an IllegalArgumentException within seam. (The exception seems to be caused 
because modelInstance evaluates to null within the validate method in  
org.jboss.seam.core.Expressions)

If I refactor the code, and take all the elements out of the tagfile and put 
them into the main page, then the validation works correctly.

Richard.



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