code: @Override
      public String[] getCacheInstanceNames() {
          Map instances = ServerCache.getCacheInstances();
          String names[] = new String[instances.size()];
          Iterator it = instances.keySet().iterator();
          int i = 0;
          while (it.hasNext()) {
              names[i] = (String) it.next();
              i++;
          }
          return names;
      }
docs: /*
  (non-Javadoc)
  
  @see com.ibm.websphere.cache.CacheAdminMBean#getCacheInstanceNames()