code: public void removeExternalCacheAdapter(String groupId, String address) throws DynamicCacheServiceNotStarted {
      	if (servletCacheUnit == null) {
      		throw new DynamicCacheServiceNotStarted("Servlet cache service has not been started."); 
      	}
      	servletCacheUnit.removeExternalCacheAdapter(groupId, address);
      }
docs: This implements the method in the CacheUnit interface.
  This is delegated to the ExternalCacheServices.
  It calls ServletCacheUnit to perform this operation.
  
  @param groupId The external cache group id.
  @param address The IP address of the target external cache.