LinkedList or not...

I'm attempting to utilize some things from java.util, and am having  
difficulty.  I'm creating a custom class that will return a summary  
list of items, however, on compilation, WO complains about not being  
able to find the constructor LinkedList.  Here are the imports that  
I'm using.

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

This is a WO 5.3 project so what am I missing?

Thanks for any ideas
Kent