java - presist 并重新启动后，数据库中没有任何内容休眠

Question

我一直在尝试学习 JPA、EJB、servlet，大部分情况下一切正常。但是，无论我做什么，我实际上都无法在 Wildfly 服务器上重新启动应用程序后找到我坚持的任何内容。

真令人沮丧，没有错误消息，日志中没有任何内容，当我检查我的对象是否在带有 .contains 的实体管理器中时，它确实返回 true。

我试过添加一个 .flush()

我尝试将我的类添加到persistance.xml。（它的意思是自动找到它吗？）

我尝试将 generation.database.action 更改为：create、drop-and-create、drop 和 none；没运气。

这是文件，如果有人可以提供帮助，那就太好了，因为我很困惑。

持久性.xml：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.2" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
    <persistence-unit name="EJBColis">
        <class>jpa.Colis</class>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        <properties>
            <property name="javax.persistence.schema-generation.database.action" value="create"/>
        </properties>
    </persistence-unit>
</persistence>

EJBColis.java

package ejb;

import java.util.LinkedList;
import java.util.List;

import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;

import jpa.Colis;
import jpa.Mesure;
import jpa.Position;

@Stateless
@LocalBean
public class EJBColis {
    @PersistenceContext
    private EntityManager em;
    
    
    /**
     * Constructeur sans parametre obligatoire
     */
    public EJBColis() {
    }
    
    public Colis addColis(double poid,double valeur,String origin,String destination,Position p ) {
        Colis m = new Colis(poid, valeur, origin, destination, p);
        em.persist(m);
        em.flush();
        em.refresh(m);
        return m;
    }
 
    public Colis findColis(long id) {
        Colis m = em.find(Colis.class, id);
        return m;
    }
    
    public Position changePosition(long ColisId,double longitude,double lat,String origin,String destination) {
        Position m = new Position(longitude,lat, origin, destination);
        Colis c = findColis(ColisId);
        c.setPosition(m);
        em.persist(c);
        em.flush();
        return m;
    }
    
    public Position findPosition(long id) {
        Position m = em.find(Position.class, id);
        return m;
    }

}

addColisServlet.java ：

package servlet;

import java.io.IOException;

import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import ejb.EJBColis;
import jpa.Colis;
import jpa.Mesure;
import jpa.Position;

/**
 * Servlet implementation class AddColisServlet
 */
@WebServlet("/AddColisServlet")
public class AddColisServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    
    // injection de la reference de l'ejb
    @EJB
    private EJBColis ejb;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public AddColisServlet() {
        super();
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        double Poid = Double.parseDouble(request.getParameter("poid"));
        double valeur = Double.parseDouble(request.getParameter("valeur")) ;
        String origine = request.getParameter("origine");
        String destination = request.getParameter("destination");
        Position position = null;
        
        
        
        
        Colis m = ejb.addColis(Poid, valeur, origine, destination, position);       
        // ajout de la mesure dans la requete
        request.setAttribute("Colis",m);
        // transfert a la JSP d'affichage
        request.getRequestDispatcher("/showColis.jsp").forward(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

调用 addColisServlet 的 html 页面：

<!DOCTYPE html>
<html>
<head>
    <meta charset="ISO-8859-1">
    <title>Manipulation des comptes bancaires</title>
    <link rel="stylesheet" type="text/css" href="css/base.css" >
</head>
<body>
<h1>Manipulation des comptes bancaires</h1>
    <h2>tracker un colis :</h2>
    <form action="ShowColisServlet" method="post">
        ID : <input type="number" name="ID">
        <input type="submit" value="valider">
    </form>
    <h2>Creer un colis</h2>
    <form action="AddColisServlet" method="post">
        Poid : <input type="number" name="poid">
        valeur : <input type="number" name="valeur">
        origine : <input type="text" name="origine">
        destination : <input type="text" name="destination">
        <input type="submit" value="valider">
    </form>
    <h2>modifier position d'un colis:</h2>
    <form action="ModifColisServlet" method="post">
        ID : <input type="text" name="ID">
        latitude : <input type="number" name="lat">
        longitude : <input type="number" name="long">
        emplacement : <input type="text" name="emplacement">
        etat : <input type="text" name="etat">
        <input type="submit" value="chercher">
    </form>
</body>
</html>

我还设置了一个指向代码的 github 链接，它是一个 Eclipse 项目：

https://github.com/vvhitefox/ColisEJB

标签： javahibernatejpa