Yes its possible, you just have to set virtual host on your apache (front-end) to the LibreSource tomcat.
And update your
JONAS_ROOT/conf/server.xml for tomcat configuration.
Sample configuration:
Apache
<VirtualHost *>
ServerAdmin jourdain@artenum.com
ServerName www.myLibreSourceServer.com
ErrorLog error_log
CustomLog access_log combined
ProxyPass / http://ls-local-ip:9000/
ProxyPassReverse / http://ls-local-ip:9000/
</VirtualHost>
JOnAs / Tomcat
<Connector port="9000"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="9043" acceptCount="100"
debug="0" connectionTimeout="20000"
disableUploadTimeout="true"
proxyName="www.myLibreSourceServer.com"
proxyPort="80"
/>