NullPointerException on a method declaration?

Question

Hi all,
I'm not sure whether I should be posting this here on on the app server board.
But anyway, I have an ADF application (with ADF Faces) that works fine in JDev 10.1.3, and after some difficulty, I've managed to get it deployed, so that the first page comes up properly in a browser.
When I click on a link in my navigation tree, however, I get an error in the method called by the CommandLink in the tree node. Here's what it is:
javax.faces.FacesException: #{homeBean.treeNavigate}: javax.faces.el.EvaluationException
Caused by [at the bottom]: java.lang.NullPointerException
at mypackage.BasePage.TreeNavigate (BasePage.java:53)
So OK, for some reason my code is firing a null pointer exception in the deployed version. Let's see what it is by checking BasePage.java, line 53:
53) public String treeNavigate() {
A method declaration. That shouldn't be able to throw a NullPointerException, or indeed any other runtime error, should it?
Can anyone shed some light about what might be going on here?
Thanks much,
Avrom

Answer 1

public void drawPictures(int size, Graphics page)
          page.drawImage (board, 0, 0, 720, 567, this);
public void paint (Graphics page)
          drawPictures (APPLET_WIDTH, page);
private final int APPLET_WIDTH = 720;
board = getImage (getDocumentBase(), "board.jpg"); //inside my init() methodThanks for the quite response. I looked at my code with your suggestions and came up with this:
If I take away my "paint" method, the buttons have no problems, but, of course, no picture comes up. Any ideas?
I was also throw out the fact that this is my first time with GUIs. My teacher saved them to the end last year, got lazy, and then never did them. So if I am using horrible self-taught practices, it would be awesome if you can let me know, so I can improve. Thanks.
Edited by: 7sunami on Feb 22, 2009 6:00 PM