Java Client Applet - Incompatible Magic Value

Sometimes I ask my friends to try out my applet and some get in and it works FINE for them... and for others... they get this error ...

java.lang.ClassFormatError: Incompatible magic value 1008813135 in class file tileGen
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(Unknown Source)
	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 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)

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Maybe it's because I compiled with the latest version of java and the friends are used an outdated java? maybe? What do you think?

thanks.
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UrbanTwitchAsked:
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objectsCommented:
yes that error is caused by comiling for a later version of java than it is being run with
you can use the javac switchs -target -source to control what version class file is produced
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UrbanTwitchAuthor Commented:
What would be a good version to compile at? 1.5?
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objectsCommented:
actually that value suggests its a corrupt class file that is being used.
might be worth getting them to clear there java cache and reload the applet

> What would be a good version to compile at? 1.5?

1.5 is a good choice
to do that you need to make sure you're not using any 1.6 features.
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UrbanTwitchAuthor Commented:
Well then, my tileGen probably is because my friend who had the error got another error... so yeah.. either update or don't play. thanks.
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