If loaded by different class loaders, two classes with the same name, even the same package name, are treated as distinct — even if, in fact, they are byte-for-byte the same class.
即使两个实例的类名字一样，甚至包名也一样，更甚至于每一个字节都是一样的，但是如果他们被不同的类加载器加载，他们也会被当着是不同的实例。
In other words, when two class loaders load different classes (that is, different bytecodes) with the same name, class loader constraints guarantee that there will be no type mismatch between them.
换句话说，当两个类装入器用相同的名称装入不同的类时(也就是不同的字节码)，类装入器约束保证了它们之间不会有类型不匹配。
Theses clone classes must have the same name than the Domain class (in a different package) and inherits from LazyGwtPojo.
这些克隆类必须使用和域类本身一样的名字（但两者在不同的包中），并且继承LazyGwtPojo。
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