如何在java字节码中修改局部变量的类型

Question

I am rewriting bytecode using Javassist. I need to modify type of some local variables to object. How can I access local variables and change their types using Javassist?

Thanks.

Answer 1

This question is quite old but since I did something similar I'll post my solution:

Since I did not found any solution to change the type of a field in a class in Javassist, I just deleted the old method and added a new one with the same name but my desired type:

CtClass point = ClassPool.getDefault().get("Point");
CtField toBeDeleted = point .getField("fieldName");
point .removeField(toBeDeleted);
CtField newField = CtField.make("public int fieldName = 0;", point);
point.addField(newField );

So with this example I took the field fieldName in class point that was of type let's say Object and know has been changed in a field of type 'int' and initialized to 0