Description
If you set your Application with getResourceSettings().setCachingStrategy( new FilenameWithTimestampResourceCachingStrategy() );
Then in a WebPage#renderHead(IHeaderResponse response)
response.renderCSSReference( MyResourceReference )
generates an URL that is not decorated by the CachingStrategy.
And the ResourceReference is cached forever.
The same with a QueryStringWithTimestampResourceCachingStrategy generates a NPE (See WICKET-3882 ).