can i change a non-static method to static method?

[zhangzishen9]

i want to create a new class by template class and change template class'non-static method to static method

import javassist.ClassPool;
import javassist.CtClass;
import javassist.Modifier;

public class Template {
    public void templateMethod(Object arg) {
        //do something
    }

    public static void main(String[] args) throws Exception {
        ClassPool pool = ClassPool.getDefault();
        CtClass template = pool.get("Template");
        CtClass newClass = pool.makeClass(template.getClassFile());
        newClass.setName("FinalClass");
        newClass.getDeclaredMethod("templateMethod", new CtClass[]{pool.get(Object.class.getName())}).setModifiers(Modifier.PUBLIC | Modifier.STATIC);

        Class result = newClass.toClass(sun.misc.Launcher.getLauncher().getClassLoader());
    }
}

    

but finall will throw error:

Type top (current frame, locals[0]) is not assignable to reference type

[FedericoBruzzone]

Before the fix maybe you can use:

---

class MyClassLoader extends ClassLoader { ... }

---

public class Template {
    . . .
    byte[] b = newClass.toBytecode()
    ClassLoader cl = new MyClassLoader.defineClass(newClass.getName(), b, 0, b.length)
}