I got it working. Seems like Tomcat started out of Eclipse is ignoring the Windows Path. You have to go to
Windows-Preferences-MyEclipse-Application Servers-Tomcat 5-Path
There add the directory with the libraries to “Append to library path”
Btw: If you intend to run multiple apps with this library you must move the jar that calls the lib to {tomcat-root}/common/lib
Thx for helping
🙂 stw