public void setReference(String reference) {
    this.reference = reference;
  }
Sets the path to the referenced Kerberos identity definition

@param reference the path to the referenced Kerberos identity definition or <code>null</code>
                 to indicate no reference
ambari-server/src/main/java/org/apache/ambari/server/state/kerberos/KerberosIdentityDescriptor.java