必须实现 UserRegistry 接口中已废弃的 getUsersForGroup() 方法，用户注册中心人员解析插件才能完全支持自定义注册中心。

The deprecated getUsersForGroup() method of the UserRegistry interface must be implemented for custom registries in order to be fully supported by the user registry staff resolution plug-in.

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要想从不同的位置注册插件，可以采用以下两种方法之一。

In order to register the plug-in from a different location, do one of the following.

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插件的启动方法方便于实现插件的初始化和注册行为。

The start method has been a convenient place to implement initialization and registration behavior for a plug-in.

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