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Editorial Team
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Asked: 2026-06-02T17:30:54+00:00

Hey everyone I am making my first applet for java today. I have been

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Hey everyone I am making my first applet for java today. I have been using a subdomain at a server and I don’t know what to do because I am getting this really weird error.

I have my jar in the server and everything but every time I try to load the Applet this happens.

java.lang.ClassFormatError: Incompatible magic value 218774561 in class file Evolution/EvolutionApplet

Upon research it appears that an incompatible magic value means that something has been corrupted in the .jar

Here is the website http://dementedgames.site88.net/Main.html
the jars name is Evolution if you need the html code it is at the website.

Edit: The applet should be launched from Evolution.EvolutionApplet not Evolution.Evolution

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1 Answer

  1. Editorial Team

    The original problem seems fixed now. I could download the Jar from http://dementedgames.site88.net/Evolution.jar

    Update

    It seems the Evolution.Evolution class is not an applet! Running it from the command line using:

    java -jar Evolution.jar

    Produces a frame (with a very ‘retro’ look)! As such, forget this applet nonsense, and launch the frame from a link using Java Web Start.

    Old Answer

    OTOH it now throws a ClassNotFoundException that (after inspecting the Jar) makes me think it should be:

    <html>
<head>
<title>Evolution</title>
</head>
<body bgcolor="#000000" text="#906060">
<center>
<applet code="Evolution.Evolution" archive="Evolution.jar" width="800" height="600">
</applet>
</center>
</body>
</html>

    There are two changes to the code attribute worth noting.

    1. The .class extension was removed. A minor matter, adding it is tolerated, but not correct.
    2. The Applet removed from the class name.
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