The Java ClassBuilder is a simple framework for bytecode transformation of existing Java classes, in order to make them easily usable for data binding (and other uses) when developing Java desktop applications.

Although the ClassBuilder is a (very lightweight) framework, it's focus is on a set of ready out-of-the-box solutions that aim to bring easy to use data binding to the Java platform. Under the hood it uses the amazing Javassist bytecode transformation library to change the structure of Java classes at runtime.

Let's repeat: the focus of the ClassBuilder is not on providing a framework (there's enough of those already), but providing ready-to-use solutions that utilize it under the hood.