When Processing moved to 2.0b8 it stopped using the java.awt.event.KeyEvent class and has replaced this class with its own KeyEvent class. The getKeyText method is part of the Java class but not the Processing KeyEvent class.

Unfortunately the examples on the wiki are now all out of date so you might use the code below. I have tested it with 2,0b8 and it seems fine.

import java.util.*;

1. HashSet<Integer> keysDown = new HashSet<Integer>();
2. 
   
3. int px = 0;
4. 
   
5. void setup() {
6.   size(800, 256);
7.   stroke(0);
8.   strokeWeight(1);
9.   fill(255, 0, 0);
10. }
11. 
    
12. void draw() {
13.   stroke(255);
14.   line(px, 0, px, height);
15.   stroke(255, 0, 0);
16.   for (Integer k : keysDown) {
17.     if (k >=0 && k < height)
18.       point(px, k);
19.   }
20.   px++;
21.   px %= width;
22. }
23. 
    
24. void keyPressed() {
25.   println(keyEvent.getKeyCode());
26.   keysDown.add(keyEvent.getKeyCode());
27. }
28. 
    
29. void keyReleased() {
30.   keysDown.remove(keyEvent.getKeyCode());
31. }
32. 
    
33. boolean keyDown(int kcode){
34.   return keysDown.contains(kcode);
35. }