java - Spring TransactionRequiredException 异常

Question

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;
    }
}

当我调用 merge 方法时，我得到一个异常:javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread - cannot reliable process 'merge' call

可能是我的 RepositoryConfig 缺少一些额外的配置？

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());
    }
}

现在它因 StackOverflow 而失败。可能是 DataSourceTransactionManager 不适合 JPA？

Answer 1

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

• 您的 txManager 方法应重命名为 transactionManager。
• 您需要一个 JpaTransactionManager 而不是 DataSourceTransactionManager

编辑

为了与 JPA 进行功能齐全的交易，您需要:

• 在您的配置文件中使用@EnableTransactionManagement
• 声明一个EntityManagerFactoryBean
• 声明一个 JpaTransactionManager(bean 必须命名为 transactionManager)，它是使用您之前声明的 EntityManagerFactoryBean
创建的
• 在您的@Repository(必须是一颗 Spring Bean )
• 从 @Service 调用您的存储库并使用带有 @Transactional 注释的 public 方法

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。