It took a while to figure it out but I succeeded to use Apache2 as a proxy. This way I can transfer application per application from Tomcat on my old Linux server to the new Linux server. The problem was the configuration of the JkMount points. At this moment they are in /etc/apache2/sites-available/default configuration file. I am not 100% happy with this solution because this file is delivered with Apache2. I hope that this file will not be overwritten by a future installation.
At the same time I 'activated' the SubVersioN web-module. I will start using this as soon as possible so I can track my changes in all scripts and sources. On the old server I had CVS. Since I hardly used it then I will not import the projects from there into SVN.