異常 javax.persistence.PersistenceException 問題

Question

（對不起我的英語我有點法國人）。 我是 Java ee 的新手，想放一個 JPA ORM。 當我在 Glassfish 服務器上啟動它時，我嘗試並認為我做得很好。 我有：javax.persistence.PersistenceException：EntityManager 沒有持久性提供程序，名為 test Exception。 我知道這是一個很常見的錯誤，但我嘗試了很多東西。 我不知道問題出在哪里......這是我的一些代碼：文章bean：

package beans;

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 = "T_Articles")
public class Article {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int idArticle;

    private String description;

    private String brand;

    @Column(name = "UnitaryPrice")
    private double price;

    public Article() {
        this("unknown", "unknown", 0);
    }

    public Article(String description, String brand, double price) {
        this.setDescription(description);
        this.setBrand(brand);
        this.setPrice(price);
    }

    public int getIdArticle() {
        return idArticle;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Article [idArticle=" + idArticle + ", description=" + description + ", brand=" + brand + ", price="
                + price + "]";
    }

}

我的堅持。xml：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
    <persistence-unit name="test">
            <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>beans.Article</class>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>

        <properties>
        
            <property name="hibernate.archive.autodetection" value="class"/>
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/bddtest"/>
            <property name="hibernate.connection.username" value="root"/>
            <property name="hibernate.connection.password" value="root"/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.hbm2ddl.auto" value="create-drop"/>

        </properties>
    </persistence-unit>

</persistence>

我的 servlet 使用它：

package servlets;

import java.io.IOException;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
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 beans.Article;

/**
 * Servlet implementation class aaa
 */
@WebServlet("/aaa")
public class aaa extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public aaa() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("test");
        EntityManager em = emf.createEntityManager();
        Article c;
        c = new Article();

        em.getTransaction().begin();
        em.persist(c);
        em.getTransaction().commit();

        em.close();
        emf.close();
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

我的文件層次結構：我的文件層次結構

我不知道如何解決它你能幫我嗎？ :(

謝謝， Java EE 新手

Answer 1

我認為您在 persistence.xml 中的持久性提供程序是錯誤的。 嘗試這個：

<persistence-unit name="customersFxPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    ...