MessageConverter 中带有 @Transactional 注释的 LazyInitializationException
我有一个通过 Spring-MVC 公开的 REST 服务。我有一个特定的方法，它被正确映射并通过 HTTP 调用进行调用。我的 Spring 应用程序包含 HibernateTransactionManager ，并且事务是通过 @Transactional 注释配置的。我这样注释该方法：
@Transactional(readOnly = true)
@Override
@RequestMapping(value = "/start", method = RequestMethod.GET)
@ResponseBody
public List<SomeObject> start(....)
每当我调用 HTTP 方法时，我都会从我的 org.springframework.http.converter.json.MappingJacksonHttpMessageConverter 中得到一个 org.hibernate.LazyInitializationException 异常，它是绑定在我的应用程序上下文中。 @Transactional 注释对于 MessageConverter 也有效吗？
I have a REST-service exposed through Spring-MVC. I have a particular method which is correctly mapped and called through a HTTP-call. My Spring application contains the HibernateTransactionManager and transactions are configured through @Transactional-annotations. I annotated the method like this:
@Transactional(readOnly = true)
@Override
@RequestMapping(value = "/start", method = RequestMethod.GET)
@ResponseBody
public List<SomeObject> start(....)
Whenever I call the HTTP-method I a org.hibernate.LazyInitializationException from my org.springframework.http.converter.json.MappingJacksonHttpMessageConverter which is bound in my application context. Is the @Transactional annotation valid for the MessageConverter as well?
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您的转换器类显然正在读取一个配置为在 Hibernate 配置中延迟收集的字段。
两种可能的解决方案：
Your converter class is obviously reading a field that's configured to be collected lazily in your Hibernate configuration.
Two possible solutions:
LazyInitializationException. (This field can for example be a part of a relationship between two tables in the database.)LazyInitializationException意味着当您尝试读取实体上未初始化的数据时，您的休眠Session已关闭。您可以通过
Hibernate.initialize(entity)LazyInitializationExceptionmeans that your hibernateSessionis closed at the time you try to read uninitialized data on your entity.You can fix this by:
Hibernate.initialize(entity)