Grails GORM:无法初始化代理 - 没有会话

Question

我有一个具有以下结构的方法:

public void run(){
    ... 
    for (...) { //this part works correct

        User.withTransaction {
            User user = User.findByUsername(...);

            Position pos = Position.findByName(...)
            if(pos){ ...
            } else { ...
                try{
                    pos.save(flush:true);
                    user.position = pos;
                } catch (Exception e){ ... }
            }
            ...
            try{
                user.save(flush:true, failOnError: true);
            } catch (Exception e){ ... }
        }
    }
    //this part doesn't work
    User.findAll().each {
    ...
        if (...){
            User.withTransaction{
                ...
                //here the operation fails with 
                //org.hibernate.LazyInitializationException: 
                //could not initialize proxy - no Session
                if (!userDetailsMap.containsKey(it.username) 
                         && it.userStatus != blocked){
                    it.userStatus = blocked
                    it.save(flush:true) 
                }
            }
        }
    }
}

我到这里的例外是org.hibernate.LazyInitializationException: could not initialize proxy - no Session在我的代码的第二部分.这里的userStatus字段是对不同域类的引用.

我试图在检查属性之前添加it.refresh()和Hibernate.initialize(it)代码,但没有用.我在这做错了什么？

upd:我试图it.attach在检查属性之前调用方法,但是在方法调用之后it.attached就是is false.

Answer 1

我认为你没有做任何'错误',只是该对象与hibernate会话分离.我尝试过几件事:

• 将对象附加回hibernate会话,如下所示:object.attach()(http://grails.org/doc/2.2.1/ref/Domain%20Classes/attach.html)
• 使两个域类之间的关联非延迟(http://grails.org/doc/2.2.x/ref/Database%20Mapping/lazy.html)