@comment: http://stackoverflow.com/questions/158474/how-to-obtain-longitude-and-latitude-for-a-street-address-programmatically-and --> https://developers.google.com/maps/documentation/geocoding/
I know now what causes the problem. I have downloaded the Google Maps plugin in one project. This project has the java actions I need. In the other project I work in, the Google Maps plugin is also available, however, the java actions are missing.
I cannot simply copy the java actions from one project the the other one because the project ain't compiling after this...are there more solutions to solve this?
Thanks. It worked by exporting the package from the project with the right setting. The package could be imported and the paths are configured correctly.
So, now the google maps functionality can be used.
Mentioned suggestions highly appreciated!