Steps to reproduce:

- Reverse Engineer the 'test' operation and create a
  Sequence diagram:
 ---------------------------------------------------------
  import java.util.List;
  import java.util.Iterator;
  import java.util.LinkedList;

  public class Test {    
    void test(){
        List<String> list = new LinkedList<String>();
        Iterator<String> iter = list.iterator();
        String str = iter.next();
    }
  }
 ---------------------------------------------------------

 There is 'public Object next()' operation on the diagram instead of
 'public String next()'.