...
ImageMap was deprecated in 1.4.11 and in 1.5 it was replaced with ClientSideImageMap component
getResourceSettings().setAddLastModifiedTimeToResourceReferenceUrl() has been replaced
With https://issues.apache.org/jira/browse/WICKET-3028 and https://issues.apache.org/jira/browse/WICKET-3021 this method was replaced. The timestamp, which previously was added as a query parameter to the resource url is now part of the file's basename (the name part before the extension). This has several advantages and gives you best possible caching support. See for example chapter
...