{
if (_responseContributors == null)
return null;
for (int i = 0; i < _responseContributors.size(); i++) {
ResponseContributor rc = (ResponseContributor)_responseContributors.get(i);
if (rc.handlesResponse(cycle))
return rc.createBuilder(cycle);
}
throw new ApplicationRuntimeException(ImplMessages.unknownRequest());
}