Collection of installation & troublshooting info related to my linux (debian/mint/ubuntu) installations
Java

 /home/lucky/NetBeansProjects/JavaGUI_16/src                /pog/gui
 /home/lucky/NetBeansProjects/JavaGUI_16/build/classes/pog/jgui      
                                                                                     ^
                                                                                      |"Root" des Projektes

language_COUNTRY.properties
MessagesBundle_en_GB.properties
MessagesBundle_de_CH.properties [ok] Schweiz

.properties files:

 // das Resourcefile steht relativ zu src (d.h. - ohne Qualifikation -  in Project/src/resource.properties

 Locale.setDefault(new Locale("de", "CH"));
 bundle = ResourceBundle.getBundle("MessageBundle");  /*  in.../ProjectName/src/MessageBundle[_de_ch].properties */
 System.out.println("Message in " + Locale.getDefault() + ": " +                
 bundle.getString("greeting"));

Unklarheiten:

[] die Resource-files werden, während compilation zu den run-files genommen, normale Parms in "working Dir"
[] Aufruf eines NB-Programmes von commandline
[] Working Directory?, relativ zu was? paths?