In many cases, storing large objects in the session can be circumvented by just storing a key in the session and using this key as a reference to lookup a larger object in some other data structure.
在很多情况下，通过仅在会话中存储一个键，并使用该键作为引用以在其他数据结构中查找更大的对象，从而可以避免在会话中存储大对象。
A resource environment entry enables access to the resource by reference via JNDI lookup.
资源环境项可以通过JNDI查询来访问引用的资源。
Lookup — Looks up a datasource reference.
lookup——查找数据源引用。
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