Reflexivity and Polymorphism

I have to write a method wich can use webservices dynamically simply by passing the webservice full qualified class name as a String argument. I have a getPort method in my webservice class. I have written a small code snippet to get all the signatures of the method. Here is the output:

Méthode 1
javax.xml.namespace.QName
java.lang.Class


Méthode 2
javax.xml.ws.EndpointReference
java.lang.Class
[Ljavax.xml.ws.WebServiceFeature;


Méthode 3
java.lang.Class
[Ljavax.xml.ws.WebServiceFeature;


Méthode 4
java.lang.Class


Méthode 5
javax.xml.namespace.QName
java.lang.Class
[Ljavax.xml.ws.WebServiceFeature;

I assumed that the '[L' before class name was for 'abstract'. So i wrote this method:

public static Class<?>[] getTypes(Object[] args){
    Class<?>[] paramTypes = null;
    if(args != null)
    {
        paramTypes = new Class[args.length];
        for(int i=0;i<args.length;++i)
        {
            if(args[i] instanceof javax.xml.ws.soap.MTOMFeature){
                paramTypes[i] = args[i].getClass().getSuperclass();
            }
            else{
                paramTypes[i] = args[i].getClass();
            }
        }
    }
    return paramTypes;
}

But i have the following error:

Exception in thread "main" java.lang.NoSuchMethodException: com.****.****.****.****.****.****.getPort(java.lang.Class, javax.xml.ws.WebServiceFeature)
at java.lang.Class.getMethod(Class.java:1670)
at test.testws.createServiceSoapPort(testws.java:160)
at test.testws.main(testws.java:44)

If i delete the 'instance of' test i got this error:

Exception in thread "main" java.lang.NoSuchMethodException: com.****.****.****.****.****.****.getPort(java.lang.Class, javax.xml.ws.soap.MTOMFeature)
at java.lang.Class.getMethod(Class.java:1670)
at test.testws.createServiceSoapPort(testws.java:160)
at test.testws.main(testws.java:44)

I need some help to understand that in order to solve this problem. Thanks