CSS and Javascript not loaded in Websphere 6.1.0.5

When Confluence is used with Websphere 6.1.0.5 resources such as CSS and Javascript are not loaded correctly resulting in unstyled content and javascript errors.

From Anton on JRA-12039: The problem is that WebSphere 6.1.0.5 checks if a URL is mapped to a servlet or a file before it puts a request through the filter chain.

This means our resource requests totally miss the URL rewriting filter, breaking the loading of JS and CSS resources.