-> you need proxy and proxy_http turned on:

[] $ sudo a2enmod proxy
[] $ sudo a2enmod proxy_http


Then your apache config:

<VirtualHost *>
ServerName some.domain

# ... usual options here, then at the end add the ProxyPass entries...

ProxyPass /forms http://localhost:8080/app1/
ProxyPassReverse /forms http://localhost:8080/app1/
ProxyPreserveHost On
<Proxy *>
    Order deny,allow
    Allow from all
</Proxy>
</VirtualHost>