Why list size shows zero? - mysql

Question

I have used spring boot, try to retrieve all the product from the database ( MySQL ) . But list size is zero. There is no error is shown to console.
This is my controller:
#RequestMapping(value = "/showListOfProduct", method=RequestMethod.GET)
public String showList(Model model) {
List<Products> allProduct = productService.listAllProducts();
System.out.println("sizeEEEEEEEEEEEEEE"+ allProduct.size());
model.addAttribute("allProduct", allProduct);
return "showlist";
}
This is repository:
#Repository
public interface ProductRepository extends JpaRepository<Products, Long> {
}
This is service:
#Transactional(propagation = Propagation.REQUIRED, readOnly = true)
public List<Products> listAllProducts() {
return productRepository.findAll();
}
This is my Entity:
#Entity
#Table(name="products")
public class Products {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private long id;
#Column(name="productname")
private String productName;
#Column(name="numberofavailableinstock")
private long numberofavailableInStock;
#Column(name="productprice")
private String productPrice;
#Column(name="percentageofsell")
private double percentageOfSell;
// setter getter
This is my application.properties:
> spring.mvc.view.prefix: webapp/WEB-INF/jsp/ spring.mvc.view.suffix:
> .jsp server.port=7000 spring.datasource.url=
> jdbc:mysql://localhost:3306/myproduct spring.datasource.username=root
> spring.datasource.password=root
> spring.jpa.hibernate.ddl-auto=create-drop spring.jpa.show-sql=true
My database is:
> Table: products Columns: id int(11) AI PK productname varchar(45)
> productprice varchar(45) numberofavailableinstock varchar(45)
> percentageofsell varchar

Answer 1

Usually when I run into this type of issue, its because my #Entity and the schema don't match up properly.
You should consider adding these two properties to your application.properties:
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=update
That will help you keep schema and entity matching.