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eclipse executable-jar java

Exported runnable JAR file from Eclipse doesn’t seem to execute

(Disclaimer: I am not a Java programmer, and really have very little idea what I’m doing in Eclipse)

I hacked out an application in Eclipse a while back which I finished off and exported as a JAR which runs nicely. I didn’t take any notes or make any comments.

The time comes to make some changes to the project but I have to reload it all again because my PC has since been wiped so some settings etc have probably changed.

Anyway it all works and runs nicely from Eclipse. But when I export as a runnable JAR, and double click to run the application, it doesn’t seem to execute.

I can see that there is an instance of javaw running, but no window appears. No errors. Nada.

As I said, it works beautifully in Eclipse. Any ideas?

I have little idea of how I can detect what is going on – as I said, I am NOT a java programmer 🙂