Unable to fetch Data from database using Spring Hibernate maven - spring

Question

Program is executing Select query is also running in console but not displaying on page,please check the program and correct me thank you
Output
Output of the Program
product class
package com.ecom.Model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
#Entity
#Table(name="product")
public class Product {
#Id
#Column
private int id;
#Column
#NotNull
#Size(min=1,message="is required")
private String product_name;
#Column
#NotNull
#Size(min=1,message="is required")
private String manufacturer;
#Column
private int stock;
#Column
private String description;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getProduct_name() {
return product_name;
}
public void setProduct_name(String product_name) {
this.product_name = product_name;
}
public String getManufacturer() {
return manufacturer;
}
public void setManufacturer(String manufacturer) {
this.manufacturer = manufacturer;
}
public int getStock() {
return stock;
}
public void setStock(int stock) {
this.stock = stock;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Product(int id, String product_name, String manufacturer, int stock, String description) {
super();
this.id = id;
this.product_name = product_name;
this.manufacturer = manufacturer;
this.stock = stock;
this.description = description;
}
public Product()
{}
#Override
public String toString() {
return "Product [id=" + id + ", product_name=" + product_name + ", manufacturer=" + manufacturer + ", stock="
+ stock + ", description=" + description + "]";
}
}
product controller class
In controller i have created the model to save the data into model with the help of Product reference calling getAllProduct method.
package com.ecom.Controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import com.ecom.DAO.ProductDAO;
import com.ecom.Model.Product;
#Controller
public class ProductController {
//injecting Dependecy
#Autowired
private ProductDAO productDAO;
#RequestMapping("/ProductList")
public String ListProducts(Model theModel)
{
List<Product> theProducts = productDAO.getAllProduct();
theModel.addAttribute("products",theProducts);
return "productlist";
}
#RequestMapping("/ProductForm")
public String ProductForm(Model theModel)
{
Product theProduct = new Product();
theModel.addAttribute("addProduct", theProduct);
return "productform";
}
#RequestMapping("/saveProduct")
public String saveProduct(#ModelAttribute("addProduct") Product theProdut)
{
productDAO.addProducts(theProdut);
return "productform";
}
}
Product Dao Implementation
package com.ecom.DAOImplementation;
import java.util.List;
import javax.transaction.Transactional;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.ecom.DAO.ProductDAO;
import com.ecom.Model.Product;
#Repository("ProductDAO")
public class ProductImpl implements ProductDAO {
#Autowired
private SessionFactory sessionFactory;
#Transactional
public List<Product> getAllProduct() {
Session currentSession = sessionFactory.getCurrentSession();
Query<Product> theQuery = currentSession.createQuery("from Product",Product.class);
List<Product> products = theQuery.getResultList();
return products;
}
#javax.transaction.Transactional
public void addProducts(Product theProdut)
{
Session currentSession = sessionFactory.getCurrentSession();
System.out.println("Adding Product");
currentSession.save(theProdut);
System.out.println("Success");
}
}
Jsp page
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<table border="1px">
<tr>
<th>ID</th>
<th>Product Name</th>
<th>Manufacturer</th>
<th>Stock</th>
<th>Description</th>
</tr>
<c:forEach var="tempCustomer" items="${products}">
<tr>
<td> ${tempCustomer.id} </td>
<td> ${tempCustomer.product_name} </td>
<td> ${tempCustomer.manufacturer} </td>
<td> ${tempCustomer.stock} </td>
<td> ${tempCustomer.description} </td>
</tr>
</c:forEach>
</table>
</body>
</html>

Answer 1

Just tried to set this up by creating a sample list as shown below.
#RequestMapping("/ProductList")
public String ListProducts(Model theModel)
{
List<Product> theProducts = productDAO.getAllProduct();
Product product = new Product(1,"pro-1","man-1",10,"pro-1 desc");
theProducts.add(product);
product = new Product(2,"pro-2","man-2",10,"pro-2 desc");
theProducts.add(product);
product = new Product(3,"pro-3","man-3",10,"pro-3 desc");
theProducts.add(product);
product = new Product(4,"pro-4","man-4",10,"pro-4 desc");
theProducts.add(product);
product = new Product(5,"pro-5","man-5",10,"pro-5 desc");
theProducts.add(product);
theModel.addAttribute("products",theProducts);
return "productlist";
}
The JSP page productlist.jsp is as is. No changes done. I get the output as below.
You can perhaps try putting up debug statements to see if the theProducts is correctly populated.