changes

src/main/java/lodge/datamodel/Reservation.java

@@ -34,7 +34,7 @@ public abstract class Reservation implements IReservation{
 
     private Float price;
 
-    protected String accountNumber = null;
+    protected String accountNumber = "-99";
 
     protected Reservation() {
         numberOfBeds = 1;

src/main/java/lodge/reservationsystem/CabinReservation.java

@@ -43,9 +43,6 @@ public final class CabinReservation extends Reservation {
     if (getPhysical_address() == null) {
       throw new IllegalArgumentException(String.format("not valid, physical_address %s", this.getReservation_number()));
     }
-    if (getMailing_address() == null) {
-      throw new IllegalArgumentException(String.format("not valid, mailing_address: %s", this.getReservation_number()));
-    }
     return true;
   }
 

src/main/java/lodge/reservationsystem/HotelReservation.java

@@ -65,9 +65,6 @@ public final class HotelReservation extends Reservation {
     if (getPhysical_address() == null) {
       throw new IllegalArgumentException(String.format("not valid, physical_address %s", this.getReservation_number()));
     }
-    if (getMailing_address() == null) {
-      throw new IllegalArgumentException(String.format("not valid, mailing_address: %s", this.getReservation_number()));
-    }
     return true;
   }
 

src/main/java/lodge/reservationsystem/HouseReservation.java

@@ -53,9 +53,6 @@ public final class HouseReservation extends Reservation {
     if (getPhysical_address() == null) {
       throw new IllegalArgumentException(String.format("not valid, physical_address %s", this.getReservation_number()));
     }
-    if (getMailing_address() == null) {
-      throw new IllegalArgumentException(String.format("not valid, mailing_address: %s", this.getReservation_number()));
-    }
     return true;
   }