Question

我根据“Spring in Action”第11章创建了一个Spring JPA示例。

Java配置代码：

@Bean
public JpaVendorAdapter jpaVendorAdapter() {
    System.out.println("hello");
    HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
    System.out.println(adapter);
    adapter.setDatabase(Database.MYSQL);
    adapter.setShowSql(true);
    adapter.setGenerateDdl(false);
    adapter.setDatabasePlatform("org.hibernate.dialect.MySQLDialect");
    return  adapter;
}

@Bean
public EntityManagerFactory entityManagerFactory(DataSource dataSource, JpaVendorAdapter jpaVendorAdapter) {
    LocalContainerEntityManagerFactoryBean emfb = new LocalContainerEntityManagerFactoryBean();
    emfb.setDataSource(dataSource);
    //emfb.setPersistenceUnitName("test");
    emfb.setJpaVendorAdapter(jpaVendorAdapter);
    emfb.setPackagesToScan("com.springinaction.test");
    EntityManagerFactory emf = emfb.getObject();
    System.out.println(emf);
    return emf;
}

@Bean
public PlatformTransactionManager annotationDrivenTransactionManager(EntityManagerFactory emf) {
    //System.out.println(emf);
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf);
    return transactionManager;
}

与Spring JPA相关的Maven依赖项：

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.0.0.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate.javax.persistence</groupId>
    <artifactId>hibernate-jpa-2.0-api</artifactId>
    <version>1.0.1.Final</version>
</dependency>

该程序运行良好，直到这行代码：

System.out.println("hello");
HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();

并失败并显示以下错误消息：

hello
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaVendorAdapter' defined in class com.springinaction.test.JdbcConfig: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.orm.jpa.JpaVendorAdapter com.springinaction.test.JdbcConfig.jpaVendorAdapter()] threw exception; nested exception is java.lang.NoClassDefFoundError: org/hibernate/ejb/HibernatePersistence

有人对我说，原因可能是缺少hibernate-entitymanger.jar，但我在本地Maven存储库中找到了这个jar。

有人说理由缺少ejb3-persistence.jar，但我找不到Maven groupId / artifactId。

有人可以向我解释一下吗？

Answer 1

类org.hibernate.ejb.HibernatePersistence是hibernate-entitymanager jar的一部分。请检查此jar是否在项目类路径中或部署的war文件中。还要检查这个jar文件的版本。而不是提供hibernate-core和hibernate-jpa，你应该在pom.xml中提供hibernate-entitymanager依赖，这将下载所有必需的依赖项。您可以在https://mvnrepository.com/artifact/org.hibernate/hibernate-entitymanager/5.2.2.Final

查看相同内容

<dependency>
   <groupId>org.hibernate</groupId>
   <artifactId>hibernate-entitymanager</artifactId>
   <version>5.2.2.Final</version>
</dependency>

Spring In Action的源代码位于https://manning-content.s3.amazonaws.com/download/9/ef4e0ef-b7bd-4ab8-857d-eb635d18d425/SpringiA4_SourceCode.zip。您可以检查build.gradle文件是否使用了依赖项。

创建HibernateJpaVendorAdapter实例失败。为什么？

1 个答案: