通过允许特定类型的特定factory方法和类的静态注册，可以克服这个问题。

This problem could be overcome by allowing static registration of specific factory methods and classes for specific types.

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然而，在我们使用ofy之前，我们需要在一个静态的初始化方法中注册持久化类，如清单2的Photo。

Before we can use ofy, however, we need to register persistent classes in a static initializer like Photo in Listing 2.

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然而，在我们使用ofy之前，我们需要在一个静态的初始化方法中注册持久化类，如清单2的Photo。

Before we can use ofy, however, we need to register persistent classes in a static initializer like Photo in Listing 2.

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