How do I set the vertical scroll bar to be displayed all the time?

This is a part of program I coded:
TreeNode root = makeNBATree();
DefaultTreeModel model = new DefaultTreeModel(root);
tree = new JTree(model);
JPanel p = new JPanel();
p.setLayout(new GridLayout(1, 0));
JScrollPane sp = new JScrollPane(tree,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER,
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
sp.setPreferredSize(new Dimension(500, 500));
p.add(sp);
contentPane.add(p, "Center");
when I compiled and ran the program, it said
Exception in thread"main" java.lang.IllegalArgumentException: invalid verticalScrollBarPolicy
at javax.swing.JScrollPane.setVerticalScrollBarPolicy(Unknown Source)
at javax.swing.JScrollPane.<init>(Unknown Sourc)
at NBATreeFrame.<init>(NBATree.java:59)
at NBATree.main(NBATree.java:239)
I would like to know is there any part I coded wrong?

Take a look at the API again:
JScrollPane(Component view, int verticalPolicy, int horizontalPolicy)
You have:
JScrollPane(Component view, int Horizontal, int Vertical)

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