For those interested in the solution, it is as follows:
Add the following property to the jk-connector http-listener:
<property name="jkEnabled" value="true"/>
So, in your domain.xml file, you should have the following block:
<http-listener default-virtual-server="server" family="inet" security-enabled="false" enabled="true" server-name="" address="0.0.0.0" acceptor-threads="1" port="8009" id="jk-connector" xpowered-by="true" blocking-enabled="false">
<property name="jkEnabled" value="true">
</http-listener>
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