If you receive errors about JNDI names not being found, you've probably set one of these elements incorrectly.
如果收到找不到JNDI名称的错误消息，则可能错误设置了其中一个元素。
However, applications are still vulnerable to leaks if they incorrectly hold on to object references, as the garbage collector will not collect objects that are still referenced.
但是，如果应用程序没有正确地持有对象引用，则仍然有可能会泄露，因为垃圾收集器将不会收集仍然被引用的对象。
An application can run hundreds of different SQL statements; if only one of them is incorrectly coded or not tuned to its best, the entire system's performance can be impacted.
应用程序可以运行上百条不同的sql语句；如果其中只有一条的代码不正确或未调至最优，那可能会影响整个系统的性能。
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