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Greenfoot back
JetLennit
JetLennit wrote ...

2026/9/2

Hello again!

JetLennit JetLennit

2026/9/2

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Hello Greenfoot users! I was wondering if there is any way I could get the old jar files from my games? Most of them don't run in browser any more. The code has been missing for over 10 years at this point and I'm feeling nostalgic for where it all started. Is there someone I should try and contact? I see the owners are different now as far as I can tell so I haven't the foggiest on who I should talk to. Thanks! P.S. If you see this danpost, I cannot thank you enough for the help you provided me as a kid and I'm sure countless other aspiring programmers.
danpost danpost

2026/9/3

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Greetings, JetLennit. Two of your scenarios where uploaded with the source code being made available. These are KeyTyping and Cool Colorfull Squares. You can click the big green Greenfoot buttons near top right to download the source code. Just open downloaded file in greenfoot application, where you can then create an executable jar file from. I do not know, and kind of doubt, that you will be able to regain the source from your other scenarios. You could try to recreate them as you remember them as being, but that would not be the same, especially if it is for the memories.
JetLennit JetLennit

4 days ago

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Understood, appreciate the response! I remember back in the day you could get the jar from the webpage but I think since it is all HTML now that it isn't there anymore. Recreating could be fun, haven't done game programming in a while and I've been itching to try Raylib! Maybe this time I'll actually spell the words right lol
JetLennit JetLennit

4 days ago

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For anyone else curious there is a way to do this (though convoluted)! I used the Wayback machine to view an old version of my game's page, found the jar file in the code of the page, downloaded the jar, decompiled that, imported the project in Greenfoot, then made the changes for compatibility with new Greenfoot (java.awt.Color is no longer acceptable vs greenfoot.Color it seems). I do wonder if downloading a legacy version of Greenfoot would remove that last step. I'll find out later when I'm on not on an ARM based Mac. Edit: Seems clicking "View Applet" does the same thing as dealing with Wayback machine... that would've saved me some time if I'd been paying attention It also seems as though the jar files are still hosted on the Greenfoot server, just hidden from view.
danpost danpost

2 days ago

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JetLennit wrote...
made the changes for compatibility with new Greenfoot (java.awt.Color is no longer acceptable vs greenfoot.Color it seems)
Actually, it is javascript security measures that disallow any use of java.awt and javax.swing packages.
JetLennit wrote...
It also seems as though the jar files are still hosted on the Greenfoot server, just hidden from view.
I am not too sure on that. I was under the understanding that they were not uploaded to the site when the source code was not included as per a Greenfoot team member.
mehanix mehanix

yesterday

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I think what he means is that even though the source wasn't uploaded, since it was a jar file uploaded and viewable with a java applet viewer, if you download the jar you can "decompile" it and get the source from there (since a jar is pretty much a zip archive with the code and some other stuff on top). Am i right @jetlennit? I am on the same journey btw lol with reviving/looking at old projects. I did know how to use github(barely) so i had the source saved, just never uploaded the project because i did file-based score tracking. I upgraded it to the latest greenfoot, fixed it since i know how to code now and uploaded it recently. 10 years have passed since my very first complete project which i just uploaded here. Thank you danpost, you've helped me back in the day too, I'm a software engineer now and pretty much started with greenfoot!
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