java Spring TransactionRequiredException 异常

Spring TransactionRequiredException exception

提问by serhii

Here is my Repository configuration:

这是我的存储库配置：

@Configuration
public class RepositoryConfing {
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean(DataSource dataSource, JpaVendorAdapter jpaVendorAdapter){
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource);
        entityManagerFactoryBean.setJpaVendorAdapter(jpaVendorAdapter);
        entityManagerFactoryBean.setPackagesToScan("com.imdb.model");
        return entityManagerFactoryBean;
    }

    @Bean
    public BasicDataSource dataSource(){
        BasicDataSource ds = new BasicDataSource();
        ds.setDriverClassName("org.postgresql.Driver");
        ds.setUrl("jdbc:postgresql://localhost:5432/imdb");
        ds.setUsername("***");
        ds.setPassword("***");
        ds.setInitialSize(5);
        return ds;
    }

    @Bean
    public JpaVendorAdapter jpaVendorAdapter(){
        HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
        adapter.setDatabase(Database.POSTGRESQL);
        adapter.setShowSql(true);
        adapter.setGenerateDdl(false);
        adapter.setDatabasePlatform("org.hibernate.dialect.PostgreSQLDialect");
        return adapter;
    }
}

When I call mergemethod, I get an exception: javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread - cannot reliably process 'merge' call

当我调用merge方法时，出现异常：javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread - cannot reliably process 'merge' call

May be my RepositoryConfigis lacking of some additional configurations?

可能是我RepositoryConfig缺少一些额外的配置？

EDIT: My new Repository configuration:

编辑：我的新存储库配置：

@Configuration
@EnableTransactionManagement
public class RepositoryConfing {
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean(DataSource dataSource, JpaVendorAdapter jpaVendorAdapter){
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource);
        entityManagerFactoryBean.setJpaVendorAdapter(jpaVendorAdapter);
        entityManagerFactoryBean.setPackagesToScan("com.imdb.model");
        return entityManagerFactoryBean;
    }

    @Bean
    public BasicDataSource dataSource(){
        BasicDataSource ds = new BasicDataSource();
        ds.setDriverClassName("org.postgresql.Driver");
        ds.setUrl("jdbc:postgresql://localhost:5432/imdb");
        ds.setUsername("***");
        ds.setPassword("***");
        ds.setInitialSize(5);
        return ds;
    }

    @Bean
    public JpaVendorAdapter jpaVendorAdapter(){
        HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
        adapter.setDatabase(Database.POSTGRESQL);
        adapter.setShowSql(true);
        adapter.setGenerateDdl(false);
        adapter.setDatabasePlatform("org.hibernate.dialect.PostgreSQLDialect");
        return adapter;
    }

    @Bean
    public PlatformTransactionManager txManager() {
        return new DataSourceTransactionManager(dataSource());
    }
}

Now it fails with StackOverflow. May be DataSourceTransactionManageris not suit for JPA?

现在它失败了StackOverflow。可能DataSourceTransactionManager不适合 JPA？

回答by Alexandre Jacob

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
    return new JpaTransactionManager(entityManagerFactory);
}

• Your txManagermethod should be renamed to transactionManager.
• You need to have a JpaTransactionManagerinstead of a DataSourceTransactionManager

• 您的txManager方法应重命名为transactionManager.
• 你需要有一个JpaTransactionManager而不是一个DataSourceTransactionManager

EDIT

编辑

In order to have fully functional transaction with JPA you need to :

为了与 JPA 进行功能齐全的事务，您需要：

• Use @EnableTransactionManagementon your configuration file
• Declare an EntityManagerFactoryBean
• Declare a JpaTransactionManager(the bean must be named transactionManager) created with your previously declared EntityManagerFactoryBean
• Inject (with @PersistenceContextor @Autowired) an EntityManagerin your @Repository(which must be a spring bean)
• Call your repository from a @Serviceand use a publicmethod anotated with @Transactional

• 使用@EnableTransactionManagement您的配置文件
• 声明一个 EntityManagerFactoryBean
• 声明一个JpaTransactionManager（bean 必须被命名transactionManager）用你之前声明的EntityManagerFactoryBean
• 注射（有@PersistenceContext或@Autowired）一个EntityManager在你的@Repository（必须是一个Spring bean）
• 从 a 调用您的存储库@Service并使用带有注释的公共方法@Transactional

Of course this is simplified and I assume you are using java config, annotations, and autocomponent scanning.

当然，这是简化的，我假设您正在使用 java 配置、注释和自动组件扫描。