Added improved error Handling

src/main/java/ch/fhnw/cantoneditor/controller/OverviewController.java

@@ -4,6 +4,8 @@
 import java.awt.event.WindowEvent;
 
 import ch.fhnw.cantoneditor.datautils.DataStorage;
+import ch.fhnw.cantoneditor.datautils.TranslationManager;
+import ch.fhnw.cantoneditor.views.ErrorWindow;
 import ch.fhnw.cantoneditor.views.Overview;
 
 /** The main controller for Displaying the whole view with editing and tables */
@@ -44,9 +46,13 @@ public void windowClosed(WindowEvent arg0) {
                     System.exit(0);// Close the application reporting success
                 }
             });
+
         } catch (Exception err) {// Should never occur, and if we are dead anyway :)
             err.printStackTrace();
-            throw new RuntimeException("Fatal error when starting application", err);
+
+            ErrorWindow window = new ErrorWindow(TranslationManager.getInstance().translate("FatalErrorWhenStarting",
+                    "A fatal error occured when starting the application"), err);
+            window.show();
         }
     }
 }

src/main/java/ch/fhnw/cantoneditor/views/ErrorWindow.java

@@ -0,0 +1,38 @@
+package ch.fhnw.cantoneditor.views;
+
+import java.awt.Dimension;
+
+import javax.swing.Box;
+import javax.swing.BoxLayout;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+
+import ch.fhnw.cantoneditor.datautils.TranslationManager;
+import ch.fhnw.observation.ValueSubscribable;
+
+/** For displaying a fatal error */
+public class ErrorWindow {
+    private final ValueSubscribable<String> title;
+    private final Exception exception;
+
+    public ErrorWindow(ValueSubscribable<String> title, Exception exception) {
+        this.title = title;
+        this.exception = exception;
+    }
+
+    public void show() {
+        JFrame frame = new JFrame();
+        TranslationManager.getInstance().translate("ErrorOccured", "An Error occured").bindTo(frame::setTitle);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.PAGE_AXIS));
+        JLabel desc = new JLabel();
+        this.title.bindTo((s) -> desc.setText(s + ": "));
+        frame.getContentPane().add(desc);
+        frame.getContentPane().add(Box.createVerticalStrut(20));
+        frame.getContentPane().add(new JLabel(this.exception.toString()));
+        frame.setMinimumSize(new Dimension(350, 200));
+        frame.pack();
+        frame.setVisible(true);
+    }
+}

src/main/resources/ApplicationTranslation.properties

@@ -21,4 +21,6 @@ AddItem=Add "{item}" to "{list}"
 RemoveItem=Remove "{item}" from "{list}"
 PropertyChangeObservable=Change "{old}" to "{new}"
 Inhabitants=Inhabitants
-Area=Area
+Area=Area
+FatalErrorWhenStarting=A fatal error occured when starting the application
+ErrorOccured=An Error occured

src/main/resources/ApplicationTranslation_de_CH.properties

@@ -19,4 +19,6 @@ Search=Suechi
 AddItem="{item}" zu "{list}" hinzuefüege
 RemoveItem="{item}" vo de "{list}" lösche
 Inhabitants=Iwohner
-Area=Flächi
+Area=Flächi
+FatalErrorWhenStarting=E gatastrophale Fähler isch bim Starte vom Progrämmli passiert
+ErrorOccured=Ä Fähler ist passiert

src/main/resources/ApplicationTranslation_de_DE.properties

@@ -19,4 +19,6 @@ Search=Suche
 AddItem="{item}" zu "{list}" hinzuefüegen
 RemoveItem="{item}" von "{list}" löschen
 Inhabitants=Einwohner
-Area=Fläche
+Area=Fläche
+FatalErrorWhenStarting=Ein fataler Fehler ist beim Starten der Applikation aufgetreten
+ErrorOccured=Ein Fehler ist aufgetreten