How can I pass arguments to an extension point constructor/ createExecutableExtension with parameters in eclipse

Please also refer to my previous post.
http://exploreeclipse.blogspot.in/2015/09/reading-extension-point-from-eclipse.html

public void readExtensionPoint(String myjsonString) {

IExtensionRegistry registry = Platform.getExtensionRegistry();

IConfigurationElement[] elements = registry.getConfigurationElementsFor("com.kk.myplugin", "services");

for (IConfigurationElement iConfigurationElement : elements)

{

iConfigurationElement.getAttribute("service_id");

iConfigurationElement.getAttribute("name");

try

{

try

{

String attribute = iConfigurationElement.getAttribute("class");

String contributorName = iConfigurationElement.getDeclaringExtension().getContributor().getName();

Class<?> javaClass = Platform.getBundle(contributorName).loadClass(attribute);

Constructor<?> ctor = javaClass.getDeclaredConstructor(String.class);

IService service = (IService) ctor.newInstance(myjsonString);

return service;

}

catch (Exception e)

{

}

}

catch (CoreException e)

{

e.printStackTrace();

}

}

}