Something about mapped configurations doesn't feel right to me with regards
to overriding values.

You are not allowed to override an existing value.  This seems to break with
Map semantics, but I can see the argument that it's an "add" method and not
a "put".  Fair enough.

So, I guess the next logical question is why not?  Presumably it's so that
different libraries don't squash each other and so that Tapestry itself gets
first stab at a configuration key.  I can accept that it's a valid error
condition, but, attempting to override a value does nothing but log a
warning.  The log4j properties file generated with the maven archetype won't
log this, either, since it's not an error.  So, this can be a bit
frustrating to a new user.

Now, it's hard to complain too much.  The docs are quite clear on how
everything works, even if a bit short on rationale.  I just think that if it
truly is an error condition, it should be made explicitly so.  Or, if it's
really all that bad of a thing, then overrides should be allowed.

For what it's worth, I started thinking about this more as I tried to
contribute a new NullFieldStrategy for the key "default" in an attempt to
fix my TextFields, BeanEditForms, etc. in one spot.  I went with the
approach that felt most natural at the time, and ran into that.  So, it's
more a usability observation.

-- 
Kevin



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