@Override
  @Deprecated
  public String getCacheListener() {
    String[] o = getCacheListeners();
    if (o.length == 0) {
      return "";
    } else {
      return o[0];
    }
  }
This method will return an empty string if there are no CacheListeners defined on the region.
If there are more than 1 CacheListeners defined, this method will return the description of the
1st CacheListener in the list returned by the getCacheListeners method. If there is only one
CacheListener defined this method will return it's description

@return String the region's <code>CacheListener</code> description
@deprecated as of 6.0, use {@link #getCacheListeners} instead
geode-core/src/main/java/org/apache/geode/admin/internal/SystemMemberRegionImpl.java