public void setCritical(Boolean critical) {
        this.critical = critical;
    }
<p/>
<p>
Specifies the critical flag of the X.509 extension.
</p>

@param critical
       <p>
       Specifies the critical flag of the X.509 extension.
aws-java-sdk-acmpca/src/main/java/com/amazonaws/services/acmpca/model/CustomExtension.java