Collection holders = localServerLocators.values();
Iterator itr = holders.iterator();
while(itr.hasNext())
{
CallbackHandlerHolder holder = (CallbackHandlerHolder)itr.next();
InvokerCallbackHandler holderhandler = holder.getHandler();
boolean handlersEqual = holderhandler.equals(callbackhandler);
InvokerLocator handlerLocator = holder.getLocator();
boolean locatorsEqual = handlerLocator.equals(locator);
if(handlersEqual && locatorsEqual)
{
// the entry already exists for this pair, so return null