java - 防止 LAZY 关系异常

Question

当我尝试使用 JSON-Struts2 插件序列化对象时，我遇到了 JPA 的大问题。

我有下一个异常(exception):

Exception Description: An attempt was made to traverse a relationship using indirection that had a null Session. This often occurs when an entity with an uninstantiated LAZY relationship is serialized and that lazy relationship is traversed after serialization. To avoid this issue, instantiate the LAZY relationship prior to serialization.

这是因为一些参数是列表，这些列表与其他列表有对象..

有一种方法可以在不修改对象外观的情况下初始化所有列表吗？...或其他选项..仅使用 JSON 序列化某些参数

Answer 1

您可以检查初始化是否发生或使用 Hibernate.isInitialized 强制初始化和 Hibernate.initialize .