feat(user-service): add JPA User entity and configure Spring Data JPA

second-part/hw-02/user-service/pom.xml

@@ -1,8 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<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>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-parent</artifactId>
+    <version>4.1.1</version>
+    <relativePath />
+  </parent>
+
   <groupId>com.example</groupId>
   <artifactId>user-service</artifactId>
   <version>1.0-SNAPSHOT</version>
@@ -29,28 +37,40 @@
   </dependencyManagement>
 
   <dependencies>
+
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>
       <scope>test</scope>
     </dependency>
+
     <!-- Optionally: parameterized tests support -->
+
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-params</artifactId>
       <scope>test</scope>
     </dependency>
+
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-data-jpa</artifactId>
+    </dependency>
+
   </dependencies>
 
   <build>
-    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to
+      parent pom) -->
       <plugins>
-        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
+        <!-- clean lifecycle, see
+        https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
         <plugin>
           <artifactId>maven-clean-plugin</artifactId>
           <version>3.4.0</version>
         </plugin>
-        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
+        <!-- default lifecycle, jar packaging: see
+        https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
         <plugin>
           <artifactId>maven-resources-plugin</artifactId>
           <version>3.3.1</version>
@@ -75,7 +95,8 @@
           <artifactId>maven-deploy-plugin</artifactId>
           <version>3.1.2</version>
         </plugin>
-        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
+        <!-- site lifecycle, see
+        https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
         <plugin>
           <artifactId>maven-site-plugin</artifactId>
           <version>3.12.1</version>

second-part/hw-02/user-service/src/main/java/com/example/User.java

@@ -0,0 +1,94 @@
+package com.example;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.PrePersist;
+import jakarta.persistence.Table;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "users")
+public class User {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  @Column(nullable = false, length = 100)
+  private String name;
+
+  @Column(nullable = false, unique = true, length = 255)
+  private String email;
+
+  @Column(nullable = false)
+  private Integer age;
+
+  @Column(name = "created_at", nullable = false, updatable = false)
+  private LocalDateTime createdAt;
+
+  protected User() {}
+
+  public User(String name, String email, Integer age) {
+    this.name = name;
+    this.email = email;
+    this.age = age;
+  }
+
+  @PrePersist
+  protected void onCreate() {
+    createdAt = LocalDateTime.now();
+  }
+
+  public Long getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public Integer getAge() {
+    return age;
+  }
+
+  public LocalDateTime getCreatedAt() {
+    return createdAt;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public void setEmail(String email) {
+    this.email = email;
+  }
+
+  public void setAge(Integer age) {
+    this.age = age;
+  }
+
+  @Override
+  public String toString() {
+    return "User{"
+        + "id="
+        + id
+        + ", name='"
+        + name
+        + '\''
+        + ", email='"
+        + email
+        + '\''
+        + ", age="
+        + age
+        + ", createdAt="
+        + createdAt
+        + '}';
+  }
+}