From aa122113ade36f02dc8fdbebdf1232b5c4b8742c Mon Sep 17 00:00:00 2001
From: Kamal Wickramanayake <kamal@inbox.lk>
Date: Fri, 3 Jul 2026 19:02:36 +0530
Subject: Microservice sample projects

---
 .../com/example/resourceserver/security/User.java  | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 microservices/03-resource-server/src/main/java/com/example/resourceserver/security/User.java

(limited to 'microservices/03-resource-server/src/main/java/com/example/resourceserver/security/User.java')

diff --git a/microservices/03-resource-server/src/main/java/com/example/resourceserver/security/User.java b/microservices/03-resource-server/src/main/java/com/example/resourceserver/security/User.java
new file mode 100644
index 0000000..8f84297
--- /dev/null
+++ b/microservices/03-resource-server/src/main/java/com/example/resourceserver/security/User.java
@@ -0,0 +1,110 @@
+package com.example.resourceserver.security;
+
+import java.time.LocalDateTime;
+import java.util.Collection;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import jakarta.persistence.CollectionTable;
+import jakarta.persistence.Column;
+import jakarta.persistence.ElementCollection;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.Table;
+
+/*
+    @Table - Used to set the database table name explicitely.
+*/
+@Entity
+@Table(name = "user_account")
+public class User {
+
+    /*
+     * GenerationType.IDENTITY - Auto generate value based on database's native auto
+     * increment feature
+     */
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(unique = true)
+    private String username;
+
+    private String password;
+
+    @Column(nullable = false)
+    private String description;
+
+    /*
+     * @ElementCollection: Marks the field as a collection of basic types (Strings,
+     * Integers, etc.) or embeddable objects.
+     * 
+     * @CollectionTable: Customizes the junction table details. If omitted, JPA
+     * generates a default table name combining the entity name and the field name
+     * (e.g., User_roles).
+     * 
+     * @Column: Defines the column name for the String values inside the collection
+     * table.
+     * 
+     * Fetch Type: By default, element collections use FetchType.LAZY. If you access
+     * the set outside of an active transaction or Hibernate session, it throws a
+     * LazyInitializationException. You can switch it to fetch = FetchType.EAGER to
+     * load the strings immediately alongside the main entity.
+     * 
+     */
+    @ElementCollection(fetch = FetchType.EAGER)
+    @CollectionTable(name = "user_roles", // Name of the separate collection table
+            joinColumns = @JoinColumn(name = "user_id") // Foreign key linking back to this entity
+    )
+    @Column(name = "role_name") // Name of the column storing the actual String values
+    private Set<String> roles = new HashSet<>(); // e.g., ["ADMIN", "USER"]
+
+    public String getPassword() {
+        return password;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public Set<String> getRoles() {
+        return roles;
+    }
+
+    public void setRoles(Set<String> roles) {
+        this.roles = roles;
+    }
+}
\ No newline at end of file
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