public void setDefaultAction(WafAction defaultAction) {
        this.defaultAction = defaultAction;
    }
<p>
A default action for the web ACL, either ALLOW or BLOCK. AWS WAF performs the default action if a request doesn't
match the criteria in any of the rules in a web ACL.
</p>

@param defaultAction
       A default action for the web ACL, either ALLOW or BLOCK. AWS WAF performs the default action if a request
       doesn't match the criteria in any of the rules in a web ACL.
aws-java-sdk-waf/src/main/java/com/amazonaws/services/waf/model/UpdateWebACLRequest.java