Incompatible magic value 1013478509 class file org/lwjgl/util/applet/AppletLoade

[AGP]

I don't get it. Why am I getting this error? Is it a security thing?

java.lang.ClassFormatError: Incompatible magic value 1013478509 in class file org/lwjgl/util/applet/AppletLoader
   at java.lang.ClassLoader.defineClass1(Native Method)
   at java.lang.ClassLoader.defineClass(Unknown Source)
   at java.security.SecureClassLoader.defineClass(Unknown Source)
   at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
   at java.lang.ClassLoader.loadClass(Unknown Source)
   at java.lang.ClassLoader.loadClass(Unknown Source)
   at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
   at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
   at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
   at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassFormatError: Incompatible magic value 1013478509 in class file org/lwjgl/util/applet/AppletLoader

[kappa]

you probably compiled your jars for a higher version of java then its trying to run on. for example your applet is compiled for java 1.6 and your trying to run it on java 1.4.

[AGP]

That's very odd, since the only version of both the JDK and the JRE that I'm running is 1.6.0u13. Is it perhaps on the server side (I wouldn't think so)?

[kappa]

hmm, some googling of the issue reveals this thread http://forums.sun.com/thread.jspa?threadID=640927 maybe it'll help.

[AGP]

Thanks for your suggestion. Progress: now I'm getting the following error (with a misspelled "please"):
"An error occurred while loading the applet.
Please contact support to resolve this issue.
Fatal error occurred (5): Corrupted pack file: magic/ver = 3C68746D/62.108 should be CAFED00D/150.7 OR CAFED00D/160.1"