KeyListener not working

For some reason, my KeyListener just isn't responding to KeyPressed events. If it matters, I'm on Ubuntu 12.04. It should be printing "Key Pressed" whenever a key is pressed, but it doesn't. Here's the code: ``` import java.awt.event.*; import javax.swing.*; import java.awt.Graphics; public class DisplayPanel extends JPanel { private Tile[][] tiles; private Creature[] creatures; private Dungeon dungeon; private Player player; public DisplayPanel(Dungeon dungeon, Tile[][] tiles, Creature[] creatures, Player player) { this.tiles = tiles; this.creatures = creatures; this.dungeon = dungeon; this.player = player; addKeyListener(new DungeonKeyListener()); requestFocus(); } protected void paintComponent(Graphics g) { int maximum = (getWidth() < getHeight()) ? getWidth() : getHeight(); for (Tile[] row : tiles) { for (Tile tile : row) { if (tile != null && tile instanceof Tile) { tile.draw(g, maximum/tiles.length, maximum/tiles[0].length); } } } for (Creature creature : creatures) { if (creature != null && creature instanceof Creature) { creature.draw(g, maximum/tiles.length, maximum/tiles[0].length); } } if (player != null && player instanceof Player) { player.draw(g, maximum/tiles.length, maximum/tiles[0].length); } } private class DungeonKeyListener extends KeyAdapter { public void keyReleased(KeyEvent e) { System.out.println("Key pressed!"); dungeon.press(e.getKeyCode()); repaint(); } } } ```