We’d love to help you and, yes, you can indeed change code that NetBeans
generates.

Can you help us to help you — put your code somewhere so that we can look
at it?

Gj

On Tue, 10 Mar 2020 at 13:48, Judi Rastall <j...@rastall.com> wrote:

> I have been doing some digging around and the first line where an image is
> called is the line identified as giving the error. However, this is part of
> the code generated by Netbeans when I created the panel using the design
> feature in Netbeans. In other words, I cannot alter it! Netbeans knows best!
>
> I thought that using the built-in design tools would be quicker and easier
> but that approach has been my undoing. So yes, I do blame Netbeans for my
> difficulties.
>
> I have made a start on rewriting everything from scratch. This is not
> helped by the many different ways in which different folk suggest the calls
> should be done. Neil's suggestion of Googling loading icons was helpful but
> did throw up several discussion threads where others were having similar
> difficulties. It seems that every tutorial I have found gives a different
> construction. The only thing that is keeping me going on trying to learn
> Java at all is the goal of "write & compile once, run anywhere".
>
> Judi
>
> On 09/03/2020 18:14, Neil C Smith wrote:
>
> On Mon, 9 Mar 2020 at 17:58, Judi Rastall <j...@rastall.com> 
> <j...@rastall.com> wrote:
>
> Trying to run from the CMD prompt, I see this error message:
> Exception in thread "main" java.lang.NullPointerException
>         at javax.swing.ImageIcon.<init>(Unknown Source)
>
> ...
>
> Why will a program that runs perfectly well within the IDE fail to run when 
> compiles?
>
> Quite easily!  My guess is the way you're passing the icon location
> into ImageIcon. You may want to Google on loading icons bundling in
> JARs - you'll find lots of info.  Loading resources from inside a JAR
> is (can be) different to loading from the filesystem.
>
> Best wishes,
>
> Neil
>
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