Late (but better late than never) acknowledge of my problem solution:
To solve the problem you have to add a new task defintion:
taskdef name=install classname=org.apache.catalina.ant.InstallTask/
and replace the deploy task within the install target with the new above
defined install task.
When trying to follow the instructions in the documentation of tomcat
(tomcat-docs/appdev/processes.html)
a simple sample of a development process is described.
When trying to intall the application to tomcat from my src-directory (without
the need to restart tomcat, the following error
