this how-to document is outdated. here is what i did (on mac os x).

1. get precompiled mod_jk from here. the latest version is 1.2.2. make sure you download the one for your appache version and configuration
2. points 1., 2., 3. and 4. as in said document. if necessary change the access rights for mod_jk.so
3. additionally add a line AddModule mod_jk.c further down in the httpd.conf
4. change to mountpoint for antville in apps.properties to match the one specified in mod_jk.conf. i.e. if you use tobi's setting then it is antville.mountpoint = /helma
5. uncomment the line AJP13_PORT=8009 in your hop.sh. you may or may not want (un)comment the other ports
6. restart apache. if you messed something up you will get an error
7. start helma and try localhost with "/" at the end and you should see your antville main page

Señores les habla el campeon de W.Eleven 6 f.e.