Update: Persistence.java (added method to verify settings data loaded from JSON)

src/main/java/de/hdm_stuttgart/battlearena/Model/DataStorage/Classes/Persistence.java

@@ -403,6 +403,18 @@ public class Persistence {
         }
     }
 
+    public void verifyAppSettings() throws DatabaseException{
+        try {
+            Parser.volumeValid(settings.getSfxVolume());
+            Parser.volumeValid(settings.getMusicVolume());
+            log.info("Settings data is valid!");
+        }
+        catch(Exception e){
+            log.error(e);
+            throw new DatabaseException(e.getMessage());
+        }
+    }
+
     public void resetPlayerStatistics() throws DatabaseException{
         try {
             verifyPlayerAccount();