problem with setIcon

[jerico]

Hi,
I am developing an application which needs to dynamically show whether a host is up or down.I have used buttons on which i am pasting the icon indicating up or down.So, when a node is down, I am replacing the icon that indicates up with the icon that indicates down using setIcon() function.But instead of changing the icon a NullPointerException is generated.For example,

private JButton c1;
Icon bug = new ImageIcon("image/coms1.gif");//this image is for up
Icon bug3= new ImageIcon("image/computer.gif");//for down
c1.setIcon(bug);
if(node is down)
c1.setIcon(bug3);

Thanks for any help.

jerico

[anubis]

i think it might be because you never initialized c1. try this
private JButton c1 = new JButton(/*put the icon here if you wanted*/);

[jerico]

Oh,I forgot to mention that line.I initialized it like u said.But it is still not working.I am using GridBagLayout() layout manager.

Jerico