put types and useAttribute classnames

[Tim Williams <wi...@gmail.com>]

What's the relationship between the type attribute in the put and the
classname in the useAttribute.  I've just resolved some of my 'type'
issues that occurred because I apparently don't understand it.  What I
was trying to do was:

- have a basedialog tile defined in tile-defs.xml that "puts" what
will be the form action
(e.g.
<definition name="basedialog">
   <put name="dialog-action" type="string" value=""/>
</def...

- have an "insert" that uses this tile and includes the form body from
another file.
(e.g.
<tiles:insert definition="basedialog">
  <tiles:put name="dialog-action" type="string" value="doSomething.do"/>
</tiles:insert>

- finally, have a the form insert the action:
(e.g.
<tiles:useAttribute id="dialog-action" name="dialog-action"/>
<html:form action="<%=dialog-action%>">

The problem occurred in this last line giving some sort of
Object/String type error.  I figured out that I could alter it to
<%=dialog-action.toString() %> and all is well.  Then, I figured if i
drop the "type" attribute on the 'put' declarations earlier, then use
classname="String" on the useAttribute, all is well.  However, I
couldn't have type="string" and classname="String".   What kind of
object is a string vs a real String?

At this point, I have something that works so I understand the "how"
but there appear to be some casting subtleties that elude me so I'd
like to get the "why" too.

(Struts 1.2.7)
Thanks,
--tim

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