Links to images and .css

Hi all.

My application, as with all applications, uses stylesheets and images. Those files are stored under $TOMCAT_HOME/webapps/my_app/resources, but when I launch my wicket application I see an error on my logs saying that the file can't be found, even though I can see it on the filesystem.

How can I make my files appear on the application?

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Cumprimentos,
Rui Pacheco