I have a big problem in my diploma project and would be very glad if you guys could help me! I made a Maven Multi Module Project and have 3 \"Core-projects\"
You should extend the scope of the component-scan e.g.
since you placed the entities in package at.naviclean.domain;
This should help you to get rid the exeption: Not an managed type: class at.naviclean.domain.Kassa
For further debugging you could try to dump the application context (see javadoc) to explore which classes have been detected by the component-scan if some are still no recognized check their annotation (@Service, @Component etc.)
EDIT:
You also need to add the classes to your persistence.xml
at.naviclean.domain.Kassa
...