Exact same code works in one class, but gives me a fatal error in another

Question

I'm feeling around in the dark like the blind noob I am trying to get a GUI to work, but this one very confusing thing is preventing me from getting anywhere. When I ran a very simple start to the program, I got a message that said: "Fatal exception occurred. Program will exit." The command line said the oh-so-helpful:
java.lang.NoSuchMethodError: main
Exception in thread "main"
with no more details than that. I have spent about an hour testing different things to find out what the hell is wrong, when I discovered that if I copy-paste the code into a new class in the same package, it works. What is going on? I'm using Eclipse. Here is the code:
public static void main(String[] args) {
          JFrame frame = new JFrame();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.getContentPane().add(new ExitImpossiblePanel());
          frame.setSize(300,300);
          frame.pack();
          frame.setVisible(true);
     }

Answer 1

masijade. wrote:
georgemc wrote:
masijade. wrote:
codinatrix wrote:
Oh, I see. I had that class open and pressed the "Run" button. I thought that meant it would run the one it had open. I guess it was trying to run the panel class instead. Wow, I spent all that time on such a dumb mistake.
It happens. ;-)It does indeed. I had the exact opposite thing happening to me the other day with some new distro of Eclipse 3.3 (Europa, I think) that decided it would - as our friend here expected - try and run main in the compilation unit in view. It's configurable in that version, but I've never needed to change it beforeI am definately going to have to watch out for that then. We currently have 3.2 here, but they perform updates at random and without warning (at least as to what, if not when) here.
;-)I suspect it was a buggy plugin, because it's only that particular distro that does it, no other 3.3 release I've used does so