Abstract classes are not types "Have you ever seen code that declared a variable of type java.util.AbstractList? No? Why not? It's there, along with HashMap and TreeSet, etc. Because AbstractList is not a type. List is. AbstractList provides a convenient base from which to implement custom Lists. But I still have the option of implementing my own from scratch if I so choose. Maybe because I need some behaviour for my list such as lazy loading or dynamic expansion, etc. that wouldn't be satisfied by the default implementation."
"cglib is a powerful, high performance and quality Code Generation Library, It is used to extend JAVA classes and implements interfaces at runtime."
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