Question

我正在学习在日食中使用JPA 这是我的简单实体：

package it.test.simplejpatest;

import java.io.Serializable;

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="HELLO")
public class HelloEntity implements Serializable{

private static final long serialVersionUID = 5385853336067023611L;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="HELLO_ID", nullable=false)
private int helloId;

@Column(name="MESSAGE")
private String message;

public int getHelloId() {
    return helloId;
}

public void setHelloId(int helloId) {
    this.helloId = helloId;
}

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message;
}

}

这是我的主要课程：

package it.test.simplejpatest;

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

public class HelloWorld {

public static void main(String[] args) {
    EntityManagerFactory emf = Persistence.createEntityManagerFactory("simpleJPA");

    EntityManager em = emf.createEntityManager();
    EntityTransaction tx = em.getTransaction();

    tx.begin();

    HelloEntity hello = new HelloEntity();
    hello.setMessage("Gonzalo Higuain");
    em.persist(hello);

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

最后，这是我的persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" 
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_1.xsd">
<persistence-unit name="simpleJPA" transaction-type="RESOURCE_LOCAL">
<class>it.test.simplejpatest.HelloEntity</class>
    <properties>
        <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/simplejpa"/>
        <property name="javax.persistence.jdbc.user" value="simplejpauser"/>
        <property name="javax.persistence.jdbc.password" value="simplejpauser"/>
        <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
    </properties>
</persistence-unit>
</persistence>

当我运行它时，我有这个例外：

Exception in thread "main" javax.persistence.PersistenceException: Invalid persistence.xml.
Error parsing XML (line-1 : column -1): cvc-elt.1: impossibile trovare la dichiarazione dell'elemento "persistence".

at org.hibernate.ejb.packaging.PersistenceXmlLoader.loadURL(PersistenceXmlLoader.java:147)
at org.hibernate.ejb.packaging.PersistenceXmlLoader.deploy(PersistenceXmlLoader.java:171)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:326)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:58)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
at it.test.simplejpatest.HelloWorld.main(HelloWorld.java:11)

我不明白这个异常，因为我正确地将持久性单元名称放在main中。谁能帮我？感谢

javax.persistence.PersistenceException：无效的persistence.xml

0 个答案: