Hibernate 5.1.1和5.2.2之间有什么变化?如果我使用5.2.2,我将收到一条错误消息“没有为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();
答案 0 :(得分:63)
hibernate-release-5.2.2.Final.zip 捆绑文件中不存在 org.hibernate.ejb.HibernatePersistence 类。这就是无法找到提供者的原因,因为该类不能(在项目库罐子里)。相反,我使用了类 org.hibernate.jpa.HibernatePersistenceProvider ,在hibernate-core-5.2.2.Final.jar中找到 CAN (与hibernate一起提供) release-5.2.2.Final.zip bundle),将persistence.xml中的提供程序更改为 <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
。这样做,它工作正常!希望问题只是这个。
答案 1 :(得分:1)
我有同样的错误。 我更改了
的版本 <dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
</dependency>
从5.3.1.Final到5.3.6.Final,错误消失了。
答案 2 :(得分:0)
有时只是忘记添加persistence.xml
文件来构建路径会导致此问题。请执行以下步骤:
persistence.xml
文件。 然后它应该工作。