java - 基于java的配置上的Spring Data CrudRepository - EntityManager - 没有事务正在进行

Question

我已经阅读过我相信尝试过所有关于此问题的帖子，但没有找到正确的答案。 我在我的 spring mvc 项目中使用基于 java 的配置，并想尝试 Spring CrudRepository，以摆脱 DAO，而那就是整个 hell 崩溃的时候: 在持久化后刷新时以“没有事务正在进行”开始: - 尝试将 @Transactional 添加到方法中 - 此处找到的所有变体都不起作用 - 尝试更改配置，但由于它是基于java的，所以大多数答案都是基于xml的。也不走运。 所以最后我要问:

如何配置我的项目以使 CrudRepository 持久存在，或者如何使用 java 配置创建 Spring EntityManager。

这是我的配置文件的最后一个版本:

@Configuration
@ComponentScan(basePackages = { "ba.fit.vms" })
@ImportResource(value = "classpath:spring-security-context.xml")
@EnableTransactionManagement
@EnableJpaRepositories
public class AppConfig {

    @Bean
    public static PropertyPlaceholderConfigurer propertyPlaceholderConfigurer() {
        PropertyPlaceholderConfigurer ppc = new PropertyPlaceholderConfigurer();
        ppc.setLocation(new ClassPathResource("/persistence.properties"));
        return ppc;
    }


    // Security Configuration
    @Bean
    public KorisnickiServis korisnickiServis(){
        return new KorisnickiServis();
    }

    @Bean
    public TokenBasedRememberMeServices rememberMeServices() {
        return new TokenBasedRememberMeServices("remember-me-key", korisnickiServis());
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new StandardPasswordEncoder();
    }

    // Jpa Configuration
    @Value("${dataSource.driverClassName}")
    private String driver;
    @Value("${dataSource.url}")
    private String url;
    @Value("${dataSource.username}")
    private String username;
    @Value("${dataSource.password}")
    private String password;
    @Value("${hibernate.dialect}")
    private String dialect;
    @Value("${hibernate.hbm2ddl.auto}")
    private String hbm2ddlAuto;   

    @Bean
    public DataSource configureDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        return dataSource;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean configureEntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(configureDataSource());
        entityManagerFactoryBean.setPackagesToScan("ba.fit.vms");
        entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());

        Properties jpaProperties = new Properties();
        jpaProperties.put(org.hibernate.cfg.Environment.DIALECT, dialect);
        jpaProperties.put(org.hibernate.cfg.Environment.HBM2DDL_AUTO, hbm2ddlAuto);
        //jpaProperties.put(org.hibernate.cfg.Environment.SHOW_SQL, true);
        entityManagerFactoryBean.setJpaProperties(jpaProperties);

        return entityManagerFactoryBean;
    }


    @Bean
    public PlatformTransactionManager transactionManager() {
        final JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(configureEntityManagerFactory().getObject());

        return transactionManager;
    }

}

我尝试了多种变体，但总是收到相同的“没有交易正在进行”错误。 另外，看一下存储库: Lokacija存储库:

@Transactional
public interface LokacijaRepository extends CrudRepository<Lokacija, Long> {

}

和 LokacijaRepositoryImpl:

@Repository
public class LokacijaRepositoryImpl implements LokacijaRepository {

    protected static Logger logger = Logger.getLogger("repo");
    @PersistenceContext // tried this as well(type= PersistenceContextType.EXTENDED)
    private EntityManager entityManager;


    @Override
    @Transactional// tried number of variations here as well, like REQUIRED...
    public <S extends Lokacija> S save(S entity) {
        logger.debug("trying to save!");
        try {
            entityManager.persist(entity);
            entityManager.flush();
            return entity;
        } catch (Exception e) {
            logger.debug("error: "+ e.toString());
            return null;
        }

    }

如果您需要其他任何信息来帮助我解决这个问题，请告诉我。

Answer 1

问题是您正在尝试创建 LokacijaRepository 的实现(在 LokacijaRepositoryImpl 中)，而 Spring Data JPA(您已配置)正在尝试执行相同的操作.

您需要做的是:

1. 完全删除LokacijaRepositoryImpl
2. 将 configureEntityManagerFactory 更改为 entityManagerFactory 或将 entityManagerFactoryRef=configureEntityManagerFactory 添加到 @EnableJpaRepositories