Oh yes, that's it, thank you.
it was this setting
var dbPropsFile = "C:/Program Files/KonaKart/webapps/konakartadmin/WEB-INF/classes/konakartadmin.properties";
I have a german windows, that's why there is no Program Files folder.
It's called Programme, so everyone who has a different language in windows should change that

thanks again, its working now.
regards