[ BAEL-2275 ] : Use UUID instead of ObjectId.

ddd/src/main/java/com/baeldung/ddd/layers/application/controller/OrderController.java

@@ -4,7 +4,6 @@ import com.baeldung.ddd.layers.application.request.AddProductRequest;
 import com.baeldung.ddd.layers.application.request.CreateOrderRequest;
 import com.baeldung.ddd.layers.application.response.CreateOrderResponse;
 import com.baeldung.ddd.layers.domain.service.OrderService;
-import org.bson.types.ObjectId;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.MediaType;
 import org.springframework.web.bind.annotation.*;
@@ -24,23 +23,23 @@ public class OrderController {
 
     @PostMapping(produces = MediaType.APPLICATION_JSON_UTF8_VALUE, consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
     CreateOrderResponse createOrder(@RequestBody final CreateOrderRequest createOrderRequest) {
-        final ObjectId id = orderService.createOrder(createOrderRequest.getProduct());
+        final UUID id = orderService.createOrder(createOrderRequest.getProduct());
 
-        return new CreateOrderResponse(id.toString());
+        return new CreateOrderResponse(id);
     }
 
     @PostMapping(value = "/{id}/products", consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
-    void addProduct(@PathVariable final ObjectId id, @RequestBody final AddProductRequest addProductRequest) {
+    void addProduct(@PathVariable final UUID id, @RequestBody final AddProductRequest addProductRequest) {
         orderService.addProduct(id, addProductRequest.getProduct());
     }
 
     @DeleteMapping(value = "/{id}/products", consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
-    void deleteProduct(@PathVariable final ObjectId id, @RequestParam final UUID productId) {
+    void deleteProduct(@PathVariable final UUID id, @RequestParam final UUID productId) {
         orderService.deleteProduct(id, productId);
     }
 
     @PostMapping("/{id}/complete")
-    void completeOrder(@PathVariable final ObjectId id) {
+    void completeOrder(@PathVariable final UUID id) {
         orderService.completeOrder(id);
     }
 }

ddd/src/main/java/com/baeldung/ddd/layers/application/response/CreateOrderResponse.java

@@ -1,15 +1,15 @@
 package com.baeldung.ddd.layers.application.response;
 
-import org.bson.types.ObjectId;
+import java.util.UUID;
 
 public class CreateOrderResponse {
-    private final String id;
+    private final UUID id;
 
-    public CreateOrderResponse(final String id) {
+    public CreateOrderResponse(final UUID id) {
         this.id = id;
     }
 
-    public String getId() {
+    public UUID getId() {
         return id;
     }
 }

ddd/src/main/java/com/baeldung/ddd/layers/domain/Order.java

@@ -1,7 +1,5 @@
 package com.baeldung.ddd.layers.domain;
 
-import org.bson.types.ObjectId;
-
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -9,12 +7,12 @@ import java.util.List;
 import java.util.UUID;
 
 public class Order {
-    private final ObjectId id;
+    private UUID id;
     private OrderStatus status;
     private List<OrderItem> orderItems;
     private BigDecimal price;
 
-    public Order(final ObjectId id, final Product product) {
+    public Order(final UUID id, final Product product) {
         this.id = id;
         this.orderItems = new ArrayList<>(Collections.singletonList(new OrderItem(product)));
         this.status = OrderStatus.CREATED;
@@ -63,7 +61,7 @@ public class Order {
         }
     }
 
-    public ObjectId getId() {
+    public UUID getId() {
         return id;
     }
 
@@ -78,4 +76,7 @@ public class Order {
     public List<OrderItem> getOrderItems() {
         return Collections.unmodifiableList(orderItems);
     }
+
+    private Order() {
+    }
 }

ddd/src/main/java/com/baeldung/ddd/layers/domain/OrderItem.java

@@ -5,8 +5,8 @@ import java.util.Objects;
 import java.util.UUID;
 
 public class OrderItem {
-    private final UUID productId;
-    private final BigDecimal price;
+    private UUID productId;
+    private BigDecimal price;
 
     public OrderItem(final Product product) {
         this.productId = product.getId();
@@ -21,6 +21,9 @@ public class OrderItem {
         return price;
     }
 
+    private OrderItem() {
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;

ddd/src/main/java/com/baeldung/ddd/layers/domain/repository/OrderRepository.java

@@ -1,12 +1,12 @@
 package com.baeldung.ddd.layers.domain.repository;
 
 import com.baeldung.ddd.layers.domain.Order;
-import org.bson.types.ObjectId;
 
 import java.util.Optional;
+import java.util.UUID;
 
 public interface OrderRepository {
-    Optional<Order> findById(ObjectId id);
+    Optional<Order> findById(UUID id);
 
     void save(Order order);
 }

ddd/src/main/java/com/baeldung/ddd/layers/domain/service/DomainOrderService.java

@@ -3,7 +3,6 @@ package com.baeldung.ddd.layers.domain.service;
 import com.baeldung.ddd.layers.domain.Order;
 import com.baeldung.ddd.layers.domain.Product;
 import com.baeldung.ddd.layers.domain.repository.OrderRepository;
-import org.bson.types.ObjectId;
 
 import java.util.UUID;
 
@@ -16,15 +15,15 @@ public class DomainOrderService implements OrderService {
     }
 
     @Override
-    public ObjectId createOrder(final Product product) {
-        final Order order = new Order(ObjectId.get(), product);
+    public UUID createOrder(final Product product) {
+        final Order order = new Order(UUID.randomUUID(), product);
         orderRepository.save(order);
 
         return order.getId();
     }
 
     @Override
-    public void addProduct(final ObjectId id, final Product product) {
+    public void addProduct(final UUID id, final Product product) {
         final Order order = getOrder(id);
         order.addOrder(product);
 
@@ -32,7 +31,7 @@ public class DomainOrderService implements OrderService {
     }
 
     @Override
-    public void completeOrder(final ObjectId id) {
+    public void completeOrder(final UUID id) {
         final Order order = getOrder(id);
         order.complete();
 
@@ -40,14 +39,14 @@ public class DomainOrderService implements OrderService {
     }
 
     @Override
-    public void deleteProduct(final ObjectId id, final UUID productId) {
+    public void deleteProduct(final UUID id, final UUID productId) {
         final Order order = getOrder(id);
         order.removeOrder(productId);
 
         orderRepository.save(order);
     }
 
-    private Order getOrder(ObjectId id) {
+    private Order getOrder(UUID id) {
         return orderRepository
           .findById(id)
           .orElseThrow(() -> new RuntimeException("Order with given id doesn't exist"));

ddd/src/main/java/com/baeldung/ddd/layers/domain/service/OrderService.java

@@ -1,16 +1,15 @@
 package com.baeldung.ddd.layers.domain.service;
 
 import com.baeldung.ddd.layers.domain.Product;
-import org.bson.types.ObjectId;
 
 import java.util.UUID;
 
 public interface OrderService {
-    ObjectId createOrder(final Product product);
+    UUID createOrder(Product product);
 
-    void addProduct(ObjectId id, Product product);
+    void addProduct(UUID id, Product product);
 
-    void completeOrder(ObjectId id);
+    void completeOrder(UUID id);
 
-    void deleteProduct(ObjectId id, UUID productId);
+    void deleteProduct(UUID id, UUID productId);
 }

ddd/src/main/java/com/baeldung/ddd/layers/infrastracture/repository/MongoDbOrderRepository.java

@@ -2,11 +2,11 @@ package com.baeldung.ddd.layers.infrastracture.repository;
 
 import com.baeldung.ddd.layers.domain.Order;
 import com.baeldung.ddd.layers.domain.repository.OrderRepository;
-import org.bson.types.ObjectId;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
 import java.util.Optional;
+import java.util.UUID;
 
 @Component
 public class MongoDbOrderRepository implements OrderRepository {
@@ -19,7 +19,7 @@ public class MongoDbOrderRepository implements OrderRepository {
     }
 
     @Override
-    public Optional<Order> findById(final ObjectId id) {
+    public Optional<Order> findById(final UUID id) {
         return orderRepository.findById(id);
     }
 

ddd/src/main/java/com/baeldung/ddd/layers/infrastracture/repository/SpringDataOrderRepository.java

@@ -1,10 +1,11 @@
 package com.baeldung.ddd.layers.infrastracture.repository;
 
 import com.baeldung.ddd.layers.domain.Order;
-import org.bson.types.ObjectId;
 import org.springframework.data.mongodb.repository.MongoRepository;
 import org.springframework.stereotype.Repository;
 
+import java.util.UUID;
+
 @Repository
-public interface SpringDataOrderRepository extends MongoRepository<Order, ObjectId> {
+public interface SpringDataOrderRepository extends MongoRepository<Order, UUID> {
 }

ddd/src/test/java/com/baeldung/ddd/layers/domain/OrderProvider.java

@@ -1,13 +1,11 @@
 package com.baeldung.ddd.layers.domain;
 
-import org.bson.types.ObjectId;
-
 import java.math.BigDecimal;
 import java.util.UUID;
 
 public class OrderProvider {
     public static Order getCreatedOrder() {
-        return new Order(ObjectId.get(), new Product(UUID.randomUUID(), BigDecimal.TEN, "productName"));
+        return new Order(UUID.randomUUID(), new Product(UUID.randomUUID(), BigDecimal.TEN, "productName"));
     }
 
     public static Order getCompletedOrder() {

ddd/src/test/java/com/baeldung/ddd/layers/domain/service/DomainOrderServiceUnitTest.java

@@ -4,7 +4,6 @@ import com.baeldung.ddd.layers.domain.Order;
 import com.baeldung.ddd.layers.domain.OrderProvider;
 import com.baeldung.ddd.layers.domain.Product;
 import com.baeldung.ddd.layers.domain.repository.OrderRepository;
-import org.bson.types.ObjectId;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.function.Executable;
@@ -33,7 +32,7 @@ class DomainOrderServiceUnitTest {
     void shouldCreateOrder_thenSaveIt() {
         final Product product = new Product(UUID.randomUUID(), BigDecimal.TEN, "productName");
 
-        final ObjectId id = tested.createOrder(product);
+        final UUID id = tested.createOrder(product);
 
         verify(orderRepository).save(any(Order.class));
         assertNotNull(id);
@@ -54,7 +53,7 @@ class DomainOrderServiceUnitTest {
     @Test
     void shouldAddProduct_thenThrowException() {
         final Product product = new Product(UUID.randomUUID(), BigDecimal.TEN, "test");
-        final ObjectId id = ObjectId.get();
+        final UUID id = UUID.randomUUID();
         when(orderRepository.findById(id)).thenReturn(Optional.empty());
 
         final Executable executable = () -> tested.addProduct(id, product);
@@ -81,7 +80,7 @@ class DomainOrderServiceUnitTest {
           .getOrderItems()
           .get(0)
           .getProductId();
-        
+
         when(orderRepository.findById(order.getId())).thenReturn(Optional.of(order));
 
         tested.deleteProduct(order.getId(), productId);