Spring boot REST API not returnning expect Json data - spring-boot

Question

I just begin my first web application using Spring Boot, and I create the first project as well as the Database for this project. It used to fine to return the list of products with encapsulated datas that a product has. When I leave it for several Days and come back, the query api return instead of the products themselves but links.
so when I type "http://localhost:8080/api/products/1" in the browser, it return this
unexpected return JSON data.
Where it use to return something like
{
"sku" : "BOOK-TECH-1000",
"name" : "Crash Course in Python",
"description" : "Learn Python at your own pace. The author explains how the technology works in easy-to-understand language. This book includes working examples that you can apply to your own projects. Purchase the book and get started today!",
"unitPrice" : 14.99,
"imageUrl" : "assets/images/products/books/book-1000.png",
"active" : true,
"unitsInStock" : 100,
"dateCreated" : "2021-01-04T21:05:48.000+0000",
"lastUpdated" : null,
"_links" : {
"self" : {
"href" : "http://localhost:8080/api/products/1"
},
"product" : {
"href" : "http://localhost:8080/api/products/1"
},
"category" : {
"href" : "http://localhost:8080/api/products/1/category"
}
}
}
I dont know why the data informations are not return anymore, any suggestion?
The return page of the GET query
The DAO class I Created for the JPA
The product class
database data, which is what should be return in the result page
Product.java:
import lombok.Data;
import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;
import javax.persistence.*;
import java.math.BigDecimal;
import java.util.Date;
#Entity
#Table(name="product")
#Data
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
//join with Entity "ProductCategory". vise verse, many products to one product Category.
#ManyToOne
#JoinColumn(name = "category_id", nullable = false)
private ProductCategory category;
#Column(name = "sku")
private String sku;
#Column(name = "name")
private String name;
#Column(name = "description")
private String description;
#Column(name = "unit_price")
private BigDecimal unitPrice;
#Column(name = "image_url")
private String imageUrl;
#Column(name = "active")
private boolean active;
#Column(name = "units_in_stock")
private int unitsInStock;
#Column(name = "date_created")
#CreationTimestamp
private Date dateCreated;
#Column(name = "last_updated")
#UpdateTimestamp
private Date lastUpdated;
}
ProductRepository.java:
import com..Entity.Product;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.web.bind.annotation.CrossOrigin;
#CrossOrigin("http://localhost:4200")
public interface ProductRepository extends JpaRepository<Product, Long> {
}

Answer 1

I faced something similar due to lombok not working popery. Writing the getter and setter manually should work. In my case, adding lombok extension for vs code solved the problem.