[EDIT] Category, CourseEntityのIDの型をlong⇒Longに変更

src/main/java/com/example/demo/app/infra/entity/CategoryEntity.java

@@ -24,7 +24,7 @@ public class CategoryEntity {
 	@Id
 	@GeneratedValue(strategy = GenerationType.IDENTITY)
 	@Column(name = "category_id")
-	private long categoryId;
+	private Long categoryId;
 
 	@Column(name = "category_name", nullable = false)
 	private String categoryName;

src/main/java/com/example/demo/app/infra/entity/CourseEntity.java

@@ -26,7 +26,7 @@ public class CourseEntity {
 	 @Id
 	 @GeneratedValue(strategy = GenerationType.IDENTITY)
 	 @Column(name = "course_id")
-	 private long courseId;
+	 private Long courseId;
 	 
 	 @Column(name = "course_name", nullable = false)
 	 private String courseName;