@Override
  protected SystemMemberCache createSystemMemberCache(GemFireVM vm)
      throws org.apache.geode.admin.AdminException {
    if (managedSystemMemberCache == null) {
      managedSystemMemberCache = new SystemMemberCacheJmxImpl(vm);
    }
    return managedSystemMemberCache;
  }
Override createSystemMemberCache by instantiating SystemMemberCacheJmxImpl if it was not
created earlier.

@param vm GemFireVM reference for which this JMX resource is to be created
@return SystemMemberCacheJmxImpl - JMX Implementation of SystemMemberCache
@throws AdminException if constructing SystemMemberCacheJmxImpl instance fails
geode-core/src/main/java/org/apache/geode/admin/jmx/internal/SystemMemberJmxImpl.java