java – Hibernate 5.2.2：没有EntityManager的持久性提供者

发布时间：2020-05-24 14:39:11 所属栏目：Java 来源：互联网

导读：Hibernate 5.1.1和5.2.2之间有什么变化？如果我使用5.2.2,我将收到一个错误消息“EntityManager命名为pu的持久性提供程序”.完全相同的配置适用于5.1.1.我应该如何更改代码以使5.2.2工作？的pom.xml ?xml version=1.0 encoding=UTF-8?project xmlns=http://m

Hibernate 5.1.1和5.2.2之间有什么变化？如果我使用5.2.2,我将收到一个错误消息“EntityManager命名为pu的持久性提供程序”.完全相同的配置适用于5.1.1.我应该如何更改代码以使5.2.2工作？

的pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>jpatest</groupId>
    <artifactId>jpatest</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <properties>
        <hibernate.version>5.2.2.Final</hibernate.version>
    </properties>
    <dependencies>
        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.postgresql/postgresql -->
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>9.4.1209.jre7</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
    </dependencies>
</project>

src / main / resources / META-INF中的persistence.xml

<?xml version="1.0" encoding="UTF-8" ?>
<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" xmlns="http://java.sun.com/xml/ns/persistence">
    <persistence-unit name="pu" >
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.archive.autodetection" value="class" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
            <property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
            <property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/mydb" />
            <property name="hibernate.default_schema" value="myschema" />
            <property name="hibernate.connection.username" value="xxx" />
            <property name="hibernate.connection.password" value="zzz" />
            <!-- <property name="hibernate.show_sql" value="true"/> -->
            <property name="hibernate.flushMode" value="FLUSH_AUTO" />
            <property name="hibernate.hbm2ddl.auto" value="validate" />
        </properties>
    </persistence-unit>
</persistence>

创建EntityManager

factory = Persistence.createEntityManagerFactory("pu");
em = factory.createEntityManager();
tx = em.getTransaction();

解决方法

hibernate-release-5.2.2.Final.zip包文件中不存在org.hibernate.ejb.HibernatePersistence类.这就是为什么无法找到提供程序的原因,因为类不能(在项目库jars).相反,我使用类org.hibernate.jpa.HibernatePersistenceProvider,可以在hibernate-core-5.2.2.Final.jar(它附带hibernate-release-5.2.2.Final.zip包)中找到,通过更改在persistence.xml中的提供者到< provider> org.hibernate.jpa.HibernatePersistenceProvider< / provider&gt ;.这样做,工作正常！希望问题只有这样.

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