import java.util.Collection; 
import java.util.Iterator; 
import java.util.List; 
import java.util.ListIterator; 

public class Bug 
{ 
    public static interface ParentA<T> { 
        T process() throws Exception; 
    } 

    public static interface ParentB<T> { 
        T process() throws Exception; 
    } 

    public static interface Child<T> extends ParentA<T>, ParentB<T> { 
    } 

    public static class ChildImpl<T> implements Child<T> { 
        @Override 
        public T process() { return null; } 
    } 
     
   public static void main(String[] args) throws Exception { 
        Child<String> child = new ChildImpl<String>(); 
        String result = child.process(); 
        System.err.println(result); 
    } 
}