Frozen classes
If a CtClass object is converted into a class file by writeFile(), toClass(), or toBytecode(), Javassist freezes that CtClass object. Further modifications of that CtClass object are not permitted. This is for warning the developers when they attempt to modify a class file that has been already loaded since the JVM does not allow reloading a class.
A frozen CtClass can be defrost so that modifications of the class definition will be permitted. For example,
CtClasss cc = ...;
:
cc.writeFile();
cc.defrost();
cc.setSuperclass(...); // OK since the class is not frozen.After defrost() is called, the CtClass object can be modified again.
