如何将 Hibernate 代理转换为真实的实体对象 [英] How to convert a Hibernate proxy to a real entity object

问题描述

在 Hibernate Session 期间，我正在加载一些对象，其中一些由于延迟加载而作为代理加载.一切正常，我不想关闭延迟加载.

During a Hibernate Session, I am loading some objects and some of them are loaded as proxies due to lazy loading. It's all OK and I don't want to turn lazy loading off.

但后来我需要通过 RPC 将一些对象(实际上是一个对象)发送到 GWT 客户端.碰巧这个具体对象是一个代理.所以我需要把它变成一个真实的对象.我在Hibernate中找不到像materialize"这样的方法.

But later I need to send some of the objects (actually one object) to the GWT client via RPC. And it happens that this concrete object is a proxy. So I need to turn it into a real object. I can't find a method like "materialize" in Hibernate.

如何将某些对象从代理转换为知道它们的类和 ID 的实数?

How can I turn some of the objects from proxies to reals knowing their class and ID?

目前我看到的唯一解决方案是从 Hibernate 的缓存中驱逐该对象并重新加载它，但由于多种原因，这确实很糟糕.

At the moment the only solution I see is to evict that object from Hibernate's cache and reload it, but it is really bad for many reasons.

推荐答案

这是我正在使用的一种方法.

Here's a method I'm using.

public static <T> T initializeAndUnproxy(T entity) {
    if (entity == null) {
        throw new 
           NullPointerException("Entity passed for initialization is null");
    }

    Hibernate.initialize(entity);
    if (entity instanceof HibernateProxy) {
        entity = (T) ((HibernateProxy) entity).getHibernateLazyInitializer()
                .getImplementation();
    }
    return entity;
}

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