将Hibernate代理转换为真实的实体对象 [英] Converting Hibernate proxy to real entity object

问题描述

在Hibernate会话期间，我加载了一些对象，并且由于延迟加载，其中一些对象被加载为代理。这一切都OK，我不想关闭延迟加载。

During 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GWT客户端发送一些对象（实际上是一个对象） RPC。碰巧这个具体的对象是一个代理。所以我需要把它变成真正的对象。我无法在Hibernate中找到像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 to real object. I can't find a method like "materialize" in Hibernate.

如何将代理中的一些对象转换为知道他们的类和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的缓存中清除该对象并重新加载它，但由于很多原因它确实很糟糕。

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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