doesn't work for me. I had to specify "/sdm-webapp/images/knife-logo-header.png".
Tried. using "images/knife-logo-header.png"
Compared generated the simple app from the maven archetype and diffed my web.xml against the generated and adopted my web.xml to match my SimpleApplication package name.
Analysis by Martin:
Wicket automatically calculates the context relative path for plain HTML <img> elements in your markup.
In the current case the <img> element is connected to a Java component, i.e. it has wicket:id attribute, and that's why Wicket doesn't apply any special logic on it.
IMO we should improve Isis to always calculate context relative path for the logo url.