added a pom.xml file for the monolithic structure, set up MVC file structure, and added basic model files using H2 database since its light and efficient

Author: Mohaned Atef

Monolithic-Ecommerce/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    This project is licensed under the MIT license. Module Monolithic-Ecommerce is part of the Java Design Patterns project.
+
+    The MIT License
+    Copyright © 2014-2022 Ilkka Seppälä
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>com.iluwatar</groupId>
+    <artifactId>java-design-patterns</artifactId>
+    <version>1.26.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>Monolithic-Ecommerce</artifactId>
+
+
+  <dependencies>
+    <!-- Spring Boot Starter Web -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-web</artifactId>
+    </dependency>
+
+    <!-- Spring Boot Starter Data JPA -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-data-jpa</artifactId>
+    </dependency>
+
+    <!-- H2 Database -->
+    <dependency>
+      <groupId>com.h2database</groupId>
+      <artifactId>h2</artifactId>
+      <scope>runtime</scope>
+    </dependency>
+
+    <!-- Jakarta Persistence API -->
+    <dependency>
+      <groupId>jakarta.persistence</groupId>
+      <artifactId>jakarta.persistence-api</artifactId>
+      <version>3.1.0</version>
+    </dependency>
+
+    <!-- JUnit for Testing -->
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <scope>test</scope>
+    </dependency>
+
+    <!-- Mockito for Unit Testing -->
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>

Monolithic-Ecommerce/src/main/java/com/iluwatar/monolithic/model/Orders.java

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+package com.iluwatar.monolithic.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+import lombok.Data;
+
+/**
+ * Represents a Database in which Orders are stored.
+ */
+@Entity
+@Data
+public class Orders {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // Auto-increment ID
+    private Long id;
+
+    @ManyToOne // Relationship with User
+    private User user;
+
+    @ManyToOne // Relationship with Product
+    private Products product;
+
+    private Integer quantity;
+
+    private Double totalPrice;
+}

Monolithic-Ecommerce/src/main/java/com/iluwatar/monolithic/model/Products.java

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+package com.iluwatar.monolithic.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.Data;
+
+/**
+ * Represents a databse of products .
+ */
+@Entity
+@Data
+public class Products {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // Generated Auto-increment ID
+    private Long id;
+
+    private String name;
+
+    private String description;
+
+    private Double price;
+
+    private Integer stock;
+}

Monolithic-Ecommerce/src/main/java/com/iluwatar/monolithic/model/User.java

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+package com.iluwatar.monolithic.model;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.Data;
+
+/**
+ * Represents a User entity for the database to interact with the rest of the project.
+ */
+@Entity
+@Data
+public class User {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // Generated Auto-increment ID
+    private Long id;
+
+    private String name;
+
+    @Column(unique = true) // Ensures unique emails
+    private String email;
+
+    private String password;
+}