Annotation on method parameter generates a ParseException

An annotated method parameter can be compiled by JDK1.5, but XDoclet2 with QDox1.6 generates:

a com.thoughtworks.qdox.parser.ParseException: syntax error @[9,27] in file:/C:/MyProj/src/com/cnn/MyMethodAnnotation.java
---------------Source Code---------------------
package com.cnn;

import org.jetbrains.annotations.NotNull;

public class MyMethodAnnotation
{
String dummy;

public void setDummy( @NotNull String dummy )

}