Struts, Message properties locale problem

[kingori]

I want to use only one message resource in my web app.

I think I wrote my struts-config right.
<message-resources
parameter="foo.bar.ApplicationResources" null="false"/>

in struts 1.1, I god error message like
???ko.menu.prefix???

so, I made another file in /foo/bar/ApplicationResources.properties_kr

I have upgraded struts to 1.2 and I god another error message
???ko_KR.menu.prefix???

In strtus document ( & another I18n properties ), if optional locale
message is not present, default local message should be retrieved.
But, as above,I got only fail message.

I'm using resin 2.1.11 and firefox.