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The following page has been changed by PhilUlrich:
http://wiki.apache.org/jakarta-tapestry/Gotchas

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  If you have defined validators in your .page descriptor, they will be 
invoked, and will reject invalid values, even if client validation is not 
enabled and you are not using the validation information they are providing. 
This means that if you define a validator and forget about it, you will 
probably at some point be scratching your head wondering why the values you are 
inputting are not appearing in your page class. This is, of course, perfectly 
logical and correct, but hopefully if you are reading this you won't waste as 
many hours as I did trying to work out what is going on.
  
+ = Don't count on having parameters in pageBeginRender() =
+ 
+ Parameters to components will not necessarily be set when pageBeginRender() 
is called - in fact, in my experience, they NEVER are. This is probably related 
to the 'Ordering of Events' gotcha above, except there doesn't seem to be any 
way around it.
+ 

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