我在eclipse中有一个动态web应用程序，它有一个普通的控制器、实体和一个dao类。
我使用hibernate从数据库中获取数据，然后在jsp页面中显示它。
但是当我尝试使用system.out.print（）时；在controller类中，查看我的数据是否从数据库中提取，而不是在控制台中打印。
我错过什么了吗？
以下是一些课程。
控制器.java

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.RequestMapping;

import com.luv2code.springdemo.dao.CustomerDAO;
import com.luv2code.springdemo.entity.Customer;

@Controller
@RequestMapping("/customer")
public class CustomerController {

    // need to inject the customer dao
    @Autowired
    private CustomerDAO customerDAO;

    @RequestMapping("/list")
    public String listCustomers(Model theModel) {

        // get customers from the dao
        List<Customer> theCustomers = customerDAO.getCustomer();

     ***//This is the sysout which is not displaying in the consol***
        System.out.println(theCustomers.get(0).getFirstName());

        theModel.addAttribute("customers", theCustomers);

        return "list-customers";
    }

}

道类

import java.util.List;

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 org.springframework.transaction.annotation.Transactional;

import com.luv2code.springdemo.entity.Customer;

@Repository
public class CustomerDAOImpl implements CustomerDAO {

    // need to inject the session factory
    @Autowired
    private SessionFactory sessionFactory;

    @Override
    @Transactional
    public List<Customer> getCustomer() {

        // get the current hibernate session
        Session currentSession = sessionFactory.getCurrentSession();

        // create a query
        Query<Customer> theQuery = 
                currentSession.createQuery("from Customer", Customer.class);

        // execute query and get result list
        List<Customer> customers = theQuery.getResultList();

        // return the results       
        return customers;
    }

}

实体类

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name ="customer")
public class Customer {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="id")
    private int id;

    @Column(name="first_name")
    private String firstName;

    @Column(name="last_name")
    private String lastName;

    @Column(name="email")
    private String email;

    public Customer() {
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Customer [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + "]";
    }

    public Customer(String firstName, String lastName, String email) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

}