Add JPanel on top of a JPanel?

Hi,
I just wonder if I can add a Jpanel on top of a Japnel since when i compile this
it has ava.lang.NullPointerException: peer
     at sun.awt.windows.WCanvasPeer.create(Native Method)
     at sun.awt.windows.WComponentPeer.<init>(WComponentPeer.java:378)
     at sun.awt.windows.WCanvasPeer.<init>(WCanvasPeer.java:26)
I appreciate if anyone can help
thks
public class MiningBox{
public JInternalFrame newMineFrame(String name) {
JInternalFrame internal = new JInternalFrame(name, true, true, true, true);
internal.setSize(519, 370);
Kmeans k_means= new Kmeans();
internal.setContentPane(k_means);
return internal;
public class Kmeans extends JPanel {
GraphCanvas graphcanvas = new GraphCanvas(this);
Options options = new Options(this);
Panel sbpanel = new Panel();
Scrollbar sb = new Scrollbar(Scrollbar.HORIZONTAL, graphcanvas.n, 5, 2,
graphcanvas.maxN);
Scrollbar sc = new Scrollbar(Scrollbar.HORIZONTAL, graphcanvas.nbclass,
3, 2, graphcanvas.maxC);
Kmeans(){
setLayout(new BorderLayout(10, 10));
sbpanel.setLayout(new GridLayout(2, 1, 0, 5));
sbpanel.add(sb);
sbpanel.add(sc);
add(BorderLayout.CENTER, graphcanvas);
add(BorderLayout.EAST, options);
add(BorderLayout.SOUTH, sbpanel);
}

Not sure exactly why you're getting this exception. You certainly can add a JPanel into another JPanel.
However, it is generally better not to mix AWT components with Swing components. AWT components are considered 'heavy-weight' components (since they use a native peer to present themselves) while Swing components are 'light-weight' (as they paint themselves based on the look-and-feel). These two types don't usually play well together.
If you can, I would recommend using a JScrollPane instead of the ScrollBar, and you would probably want to convert all of your other AWT components to Swing (ie. JPanel instead of Canvas, JPanel instead of Panel, etc.). Just doing that might clear up the problem.

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>I told someone in class lastweek that I wanted to be able
to place type
>over an
> image. They said you can just add the image into the div
tag as a
> background
> image, which will allow you to then type over it if you
like. How is this
> done?
> I have tried and failed. I have an image that is 200x590
going down the
> left
> side of my page. I want to run type over it, and keep
the image consistent
> on
> every page, but change the header and type. I've seen
this in several
> sites.
> How do you do this with the div tag box model method of
building a page.
> Can I
> insert an image into the div and then run type over it.
What does the code
> look
> like?
>

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Add JPanel on top of a JPanel?

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