QName#valueOf should throw IllegalArgumentException in following test case.

----
import javax.xml.namespace.*;

class Test {
        static public void main(String args[]){
                try{
                        QName.valueOf("{http://java.sun.com}");
                }catch(IllegalArgumentException e){
                        e.printStackTrace();
                }
        }
}
----

But the exception is not thrown in JDK 1.5 , 6 niether 7.