java - 在类路径中找不到任何 META-INF/persistence.xml 文件 Java - Dynamic Web Project

Question

我的问题和这个一样Could not find any META-INF/persistence.xml file in the classpath我需要帮助了解如何将 persistence.xml 文件添加到类路径中。

App.java

package JPA;

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

public class App {
    public static void main (String args[]) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("pu");
        EntityManager em = emf.createEntityManager();
        Alien a = em.find(Alien.class,2);
    }
}

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>

<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0"  >   
    <persistence-unit name="pu">   
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/akash"/>
            <property name="javax.persistence.jdbc.user" value="root"/>

        </properties>
    </persistence-unit>
</persistence>

在这里我对持久性"version="1.0"是否正确感到有点困惑？

>错误

Could not find any META-INF/persistence.xml file in the classpath

No Persistence provider for EntityManager named pu

我的 persistence.xml 文件存储在 META-INF 中，所以为什么它显示错误。

Answer 1

这对我有帮助

I created a new JPA Project from File-> New -> JPA Project.

It provided me the correct location of META-INF Folder which is consists of

persistence.xml

Then i add the JPA Project Facets to my project and provided all the necessary details related to my database connection.

Simply run my App.java file .

It runs.

新项目来源