once again, another dumb noob question

I have a class that extends JPanel. In it, I have a JScrollPane.
Within that JScrollPane is a JList. I know its probably something
stupid, but I can't for the life of me figure out why the JList will
not display in the JScrollPane. Any help is appreciated....

import javax.swing.*;
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import java.awt.*;
import java.awt.event.*;

public class ORNote extends JPanel{
    protected JList assistantsList;
    protected DefaultListModel assistantsDLM;
    protected JScrollPane assistantsScroller;
    protected String sSN;
    protected int dxID, prID;
    protected int WIDTH = 381;

    public ORNote(String stringSSN, int intDxID, int intPrID) {
        sSN = stringSSN;
        prID = intPrID;
        dxID = intDxID;

        setLayout(null);
        setSize(WIDTH, 100);
        Dimension prefSize = new Dimension();
        prefSize.setSize(WIDTH,200);
        setPreferredSize(prefSize);

        Border blackline = BorderFactory.createLineBorder(Color.black);
        setBorder(blackline);

        addWidgets();

        validate();
    }

    protected void addWidgets(){

        assistantsDLM = new DefaultListModel();
        assistantsList = new JList(assistantsDLM);
        assistantsScroller = new JScrollPane(assistantsList);

        assistantsDLM.addElement("TEsting");

        add(assistantsScroller);
        assistantsScroller.setBounds(80, 30, 290, 50);
        assistantsScroller.add(assistantsList);
        assistantsScroller.setViewportView(assistantsList);
        assistantsScroller.revalidate();

    }

}