There is a Reference to an object that does not exist.
有某个引用是对一个并不存在的对象。
Listing 1 shows a simple UDF for handling cases where baseline data for an object does not exist, or where counter rollover has occurred (an unlikely scenario, but it is handled).
清单1给出一个简单的UDF，它处理对象的基线数据不存在或者发生计数器翻转的情况(这种情况不太可能出现，但是能够处理)。
IF the session object does not exist, SIF creates a new security context and puts it in the security context holder.
如果不存在会话对象，SIF将创建一个新的安全上下文，并将它放到security context holder中。
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