public String getLockToken() {
        return this.lockToken;
    }
<p>
A token used for optimistic locking. WAF returns a token to your <code>get</code> and <code>list</code> requests,
to mark the state of the entity at the time of the request. To make changes to the entity associated with the
token, you provide the token to operations like <code>update</code> and <code>delete</code>. WAF uses the token
to ensure that no changes have been made to the entity since you last retrieved it. If a change has been made,
the update fails with a <code>WAFOptimisticLockException</code>. If this happens, perform another
<code>get</code>, and use the new token returned by that operation.
</p>

@return A token used for optimistic locking. WAF returns a token to your <code>get</code> and <code>list</code>
        requests, to mark the state of the entity at the time of the request. To make changes to the entity
        associated with the token, you provide the token to operations like <code>update</code> and
        <code>delete</code>. WAF uses the token to ensure that no changes have been made to the entity since you
        last retrieved it. If a change has been made, the update fails with a
        <code>WAFOptimisticLockException</code>. If this happens, perform another <code>get</code>, and use the
        new token returned by that operation.
aws-java-sdk-wafv2/src/main/java/com/amazonaws/services/wafv2/model/RegexPatternSetSummary.java