应用程序的根包含全局对象指针、静态对象指针、线程堆栈中的局部变量和引用对象参数以及CPU寄存器。
An application's roots include global and static object Pointers, local variables and reference object parameters on a thread's stack, and CPU registers.
这些对象引用参数在部署描述符（将在运行时解析）中作为资源引用公开。
These object reference parameters are exposed as resource references in the deployment descriptor which will be resolved at run time.
引用对象的字段也可以作为中介处理程序参数公开。
Fields that reference objects can also be exposed as mediation handler parameters.
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