Persistance.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="jpa" transaction-type="JTA">

        <provider>org.hibernate.ejb.HibernatePersistence</provider>

        <class>com.optirisk.pojo.Department</class>
        <class>com.optirisk.pojo.Employee</class>

        <properties>
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true" />
            <property name="hibernate.connection.username" value="NewsLetter1" />
            <property name="hibernate.connection.password" value="optiindia2012" />
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/orpss_hibernate_prototype" />
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLInnoDBDialect" />
        </properties>

    </persistence-unit>
</persistence>

Application.java

public class Application {

    private static final String PERSISTENCE_UNIT_NAME = "jpa";
    private static EntityManagerFactory entityManagerFactory;

    public static void main(String[] args) throws Exception {

        entityManagerFactory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);

        EntityManager entityManager = entityManagerFactory.createEntityManager();
        entityManager.getTransaction().begin();

        Department department = new Department();
        department.setDeptName("IT");
        entityManager.persist(department);

        Employee emp1 = new Employee("Peter", "ROB", "454565");
        Employee emp2 = new Employee("Mathew", "Anderson", "222");

        emp1.setDepartment(department);
        emp2.setDepartment(department);

        entityManager.persist(emp1);
        entityManager.persist(emp2);

        entityManager.getTransaction().commit();
        entityManager.close();

    }

}

错误：

Exception in thread "main" javax.persistence.PersistenceException: Invalid persistence.xml.
Error parsing XML (line-1 : column -1): cvc-elt.1: Cannot find the declaration of element '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:325)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:58)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
    at com.jishraa.jpa.Application.main(Application.java:19)

Answer 1

问题是您的＆lt; persistence version =“2.1”...＆gt;之间的不匹配和你的hibernate库要求。使用可靠样本中的名称空间（xmlns）复制并粘贴整个持久性标记。然后查看下面的图书馆版本。

来自hibernate.org：http://hibernate.org/orm/downloads/

支持的JPA版本
JPA 1.0: ORM 3.2+
JPA 2.0: ORM 3.5+
JPA 2.1: ORM 4.3+
请注意，较新的ORM版本向后兼容较旧的JPA 版本（例如：带有JPA 1.0的ORM 4.3）。但是，更新的ORM版本可能会与旧的JPA容器不兼容。

JPA版本与持久版本相同。 ORM是hibernate的版本。所以你的持久性文件有<persistence version="2.1" ... >。因此，截至目前，您只需要下面的hibernate库和版本（或更高版本）：

WEB-INF/lib/hibernate-entitymanager-4.3.0.Final.jar

或Maven pom.xml：

<!-- for JPA, use hibernate-entitymanager instead of hibernate-core -->
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>4.3.0.Final</version>
</dependency>

我在这个上花了很长时间。我希望我的时间可以节省你的时间！

Answer 2

我怀疑您的环境仅支持持久性2.0。尝试更改：

<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">

要：

<persistence 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_2_0.xsd" version="2.0">

Answer 3

你错过了xml中的<persistence>元素...检查你发布的xsd并使你的persistence.xml符合架构。有关简单示例，请参阅this link

javax.persistence.PersistenceException - JPA + Hibernate

Persistance.xml

Application.java

错误：

3 个答案: