我试着用Vaadin和JPA持久层做一个简单的概念验证。Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collectionof role: common.domain.Bill.detail, no session or sessi
我使用jQuery作为UI,使用Struts2作为操作,使用JPA作为数据访问层。org.hibernate.LazyInitializationException: failed to lazily initialize a collection of rolecom.singpost.ctf.core.persist