不支持的操作异常:应用程序必须提供 JDBC 连接 JPA 休眠弹簧 JDBC

Question

当我尝试开始交易时

entityManager.getTransaction().begin();

在抽象道中，我得到

java.lang.UnsupportedOperationException: The application must supply JDBC connections

我的坚持.xml

<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">
<persistence-unit name="pu" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
        <property name="hibernate.hbm2ddl.auto" value = "create-drop"/>
    </properties>
</persistence-unit>
</persistence>

我的休眠属性

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ewp?createIfNotExist=true
jdbc.username=root
jdbc.password=root
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
hibernate.format_sql=false
hibernate.hbm2ddl.auto=create-drop

实体管理器工厂豆：

    @Bean
public EntityManagerFactory entityManagerFactory(){
    EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("pu");
    return entityManagerFactory;
}

实体管理器 bean：

@Bean
public EntityManager entityManager(){
    return entityManagerFactory.createEntityManager();
}

Answer 1

在休眠站点中，您的属性名称看起来不正确。应该是，

"hibernate.connection.driver_class" for JDBC driver class
"hibernate.connection.url" for JDBC URL
"hibernate.connection.username" for database user
"hibernate.connection.password" for database user password

更正您的属性名称。

Answer 2

如果您使用带有休眠模板的 spring orm，则需要提供如下配置。我们使用Hibernate-entitymanager作为JPA实现。Hibernate-entityManager 依赖于 Hibernate-core，这就是为什么我们不必明确地将 Hibernate-core 放在 Pom 中.xml的原因。它通过 maven 传递依赖项被拉入我们的项目。

春天.xml

<beans xmlns=.....>
<context:component-scan base-package="com.town.practice" />
<context:annotation-config />
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="org.hsqldb.jdbcDriver" />
        <property name="url" value="jdbc:hsqldb:mem://productDb" />
        <property name="username" value="sa" />
        <property name="password" value="" />
    </bean>
    <bean id="entityManagerFactory" 
            class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
            p:packagesToScan="com.town.practice.model"
            p:dataSource-ref="dataSource"
            >
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="generateDdl" value="true" />
                <property name="showSql" value="true" />
            </bean>
        </property>
    </bean>
    <!-- Transactions -->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>
    <!-- enable the configuration of transactional behavior based on annotations -->
    <tx:annotation-driven transaction-manager="transactionManager" />
</beans>