<VirtualHost *:80>
ServerName subdomain.example.com

  ErrorLog ${APACHE_LOG_DIR}/error.log
  CustomLog ${APACHE_LOG_DIR}/access.log combined

  ProxyRequests Off
  ProxyPreserveHost On
  <Proxy *>
       Order deny,allow
       Allow from all
  </Proxy>
  ProxyPass / http://www.example.com:8080/xyz/
  ProxyPassReverse / http://www.example.com:8080/xyz/
</VirtualHost>