Read this answer (How to add parameter annotation to new Method ?) on the jboss community regarding adding an annotation to a parameter in a method. Stuck at getting the parameter or in Javassist terms the attribute.

Given class XYZ:

public class XYZ { public void changes(String whatever, Integer flag) { } } 

With the following code: ClassPool pool = ClassPool.getDefault(); CtClass clazz = pool.get(XYZ.class.getName());

CtMethod m = clazz.getDeclaredMethod("changes"); CtClass[] parameters = m.getParameterTypes(); // shows 2 parameter (one String, other Integer) 
AttributeInfo paramAtrributeInfo = m.getMethodInfo().getAttribute("whatever"); 

paramAttributeInfo is null. I see 2 attributes when debugging but these have concrete calls LocalVariableAttribute and LineNumberAttribute.

Can't get a handle (attribute) to add my parameter annotation to. Ideas?