如果主要类(principal class)为nil,则默认为UIApplication;如果代理类(delegate class)为nil,则程序假设程序的代理来自Main nib文件。
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principal ideal class [数] 主理想类
For each security role, a corresponding principal class and its name must be declared.
对于每个安全角色,必须声明相应的主体类及其名称。
The principal class returned by Geronimo does not contain all security information that is available in the Web container.
Geronimo返回的principal类不包含web容器中可用的所有安全信息。
Typically, Community Edition can't distinguish between two different principals that have the same name and same principal class but were produced by two different LoginModules.
通常,对于两个具有相同名称和相同主体类、但却由两个不同的LoginModule生成的不同主体,Community Edition无法进行区分。
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