0. hosts file:
127.0.0.1   wildfly.local

1. /standalone/configuration/standalone.xml:
<security-realm name="SSLCertRealm">
    <server-identities>
        <ssl protocol="TLSv1">
            <keystore path="SSLCertStore.jks" relative-to="jboss.server.config.dir" keystore-password="secret" alias="wildfly.local" key-password="secret"/>
        </ssl>
    </server-identities>
</security-realm>

2. /standalone/configuration:
keytool -genkey -alias wildfly.local -keyalg RSA -keystore SSLCertStore.jks -keysize 2048
secret
secret
wildfly.local
<enter> 5 times
CN=wildfly.local, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown
yes
<enter>

3. Web admin:
Configuration -> Web -> HTTP -> HTTPS:
Add
Name: default-https
Socket binding: https
Security realm: SSLCertRealm

4. Enjoy HTTPS on 8443 port