code: public String[] getEffectiveInternalIPList() {
          if (m_internalIPList != null) {
              return m_internalIPList;
          } else if (m_defaultConfig != null) {
              return m_defaultConfig.getEffectiveIPList();
          } else {
              return null;
          }
      }
docs: Get the effective list of internal IP addresses. This will be the
  internalIPList value, if set, or the inherited value from the default
  role, if set, or null.