Question

这是我的服务层代码：

@Override
public String getPreview(final String id) {
    final String preview = findOneById(id).getPreview();
    if ( id.equals("5065b6dd-7d61-4187-834b-2a0355c0b9e8") && preview == null || "".equals(preview)) {
        LOG.error("!!!!!!!!!!!!!!!!!!!!!!!!! PREVIEW IS EMPTY");
    }
    return preview;
}


private Entity findOneById(final UUID id) {
    return metadataRepository.findById(id).orElseThrow(() -> new NotFoundException("File not found"));
}

当我将此代码与顺序访问一起使用时，它可以正常运行，并且返回预览并且没有创建日志消息。但是当此代码接收到4个以上的并发用户时，它将返回null并显示日志消息。

我的服务标记为org.springframework.transaction.annotation.Transactional

这是我的休眠配置：

    @Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory(@Value("${spring.datasource.url}") final String jdbcUrl,
                                                                   final JpaVendorAdapter jpaVendorAdapter,
                                                                   final DataSource dataSource) {
    final LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
    entityManagerFactory.setDataSource(dataSource);
    entityManagerFactory.setPackagesToScan(PERSISTENCE_PACKAGE);
    entityManagerFactory.setJpaVendorAdapter(jpaVendorAdapter);

    final Map<String, Object> properties = entityManagerFactory.getJpaPropertyMap();
    properties.put("connection.driver_class","org.postgresql.Driver");
    properties.put("hibernate.dialect", "org.hibernate.dialect.PostgreSQL95Dialect");
    properties.put("hibernate.connection.url", jdbcUrl);
    properties.put("hibernate.cache.use_second_level_cache", "false");
    properties.put("hibernate.cache.use_query_cache", "false");
    properties.put("hibernate.format_sql", "true");
    properties.put("hibernate.jdbc.batch_size", "25");
    properties.put("hibernate.order_inserts", "true");
    properties.put("hibernate.order_updates", "true");
    return entityManagerFactory;
}

我在哪里弄错了？这个问题看起来类似于Spring Data concurrency

Spring Data + Hibernate返回NULL值，并发访问表

0 个答案: