java - JScrollPane doesn't work with JList

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I have a JList with a DefaultListModel and a JScrollPane for vertical scrolling in it:

private DefaultListModel<DMatrixSet> drawingsModel = new DefaultListModel<>();
private JList<DMatrixSet> drawings = new JList<>();
private JScrollPane scrollPane = new JScrollPane();

This is how I set them up:

 drawings.setBounds(30 + ENTRY_WIDTH, 40 + 10, ENTRY_WIDTH, ENTRY_HEIGHT);

 getContentPane().add(scrollPane);

 scrollPane.setBounds(30 + ENTRY_WIDTH*2, 40 + 10, 15, ENTRY_HEIGHT);
 scrollPane.getViewport().add(drawings);

 drawings.setModel(drawingsModel);

The problem is: the scroll pane simply does not work. It can't be scrolled nor somehow used. I add 30 elements to the list after init:

 for (int i = 0; i < 30; i++)
 drawingsModel.addElement
 (new DMatrixSet("test" + i, 1, 1));

And this is what I can see:

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لینک منبع