@Override
  public String getCustomEntryTimeToLive() {
    Object o = ra.getCustomEntryTimeToLive();
    if (o == null) {
      return "";
    } else {
      return o.toString();
    }
  }
The cache to which this region belongs
geode-core/src/main/java/org/apache/geode/admin/internal/SystemMemberRegionImpl.java