解决这个问题的最简单方法是确保在系统中只有类的一个副本——也就是说，类只出现在一个类装入器的类路径中。
The easiest way to resolve this problem is to ensure that there is only one copy of a class in the system — that is, that the class only appears in the classpath of one loader.
简单地解释即：每一个问题都有其两方面，教授有时可能只考虑到一方面，而教科书讲的可能根本就不全面。
That is simple to explain: every problem has its two professors may only take into account the one hand, and the textbooks do not talk about the possibility of all-round.
简单地按照教授提供的步骤或教材提要来解答存在一个问题，那就是你只掌握了这个问题的表面。
The problem with simply following the steps the professor provided, or the textbook Outlines, is that you're only achieving a surface-level knowledge of the problem.
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