Refactor: Rework error logging

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/database/EmbeddedDatabaseHandler.java

@@ -265,6 +265,7 @@ public class EmbeddedDatabaseHandler {
                 Array array = con.createArrayOf("VARCHAR(255)", idStrings);
                 ps.setArray(1, array);
                 ResultSet rs = ps.executeQuery();
+                boolean encounteredError = false;
                 Map<GmlId, CityObject> objects= new HashMap<>();
                 while (rs.next()) {
                     try (InputStream is = rs.getBinaryStream("data")) {
@@ -278,11 +279,13 @@ public class EmbeddedDatabaseHandler {
                         });
                         objects.put(co.getGmlId(),co);
                     } catch (InvalidClassException | ClassCastException | SerializationException e){
-                        //TODO: change this log to reflect ids map
-                        String msg = String.format("Deserialization of CityObject \"%s\" failed",ids);
-                        logger.error(msg,e);
+                        //Cant get the id of the failed Feature, as the deserialization didn't work.
+                        encounteredError = true;
                     }
                 }
+                if (encounteredError){
+                    logger.error("Deserialization of one or more Features failed");
+                }
                 return objects;
             } catch (IOException e) {
                 throw new EmbeddedDatabaseHandlerException(e);