* removes preferences
*/
@Override
protected void doDeleteWithSubjectAndActor(HttpServletRequest request, HttpServletResponse response) throws IOException
{
Broker broker = getBroker();
Collection<AuthenticationProvider> authenticationProviders = broker.getAuthenticationProviders();
Map<String, Set<String>> providerUsers = new HashMap<String, Set<String>>();
Map<String, AuthenticationProvider> requestProviders = new HashMap<String, AuthenticationProvider>();
for (String path : request.getParameterValues("user"))
{
String[] elements = path.split("/");