The operation becomes either an array item lookup or an object member lookup.
操作转换成一个数组项查询或者一个对象成员查询。
Because the JNDI lookup can be expensive, it is good practice to store the provider object as a member variable of the portlet, and to initialize it in the init method.
因为JNDI查找开销非常大，所以最好的做法是将提供程序对象存储为Portlet的成员变量，并在init方法中对其初始化。
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