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UnsupportedClassVersionError

Randall Twede
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Joined: Oct 21, 2000
Posts: 4347
    
    2

i have an applet i created in 2000. it works but im changing it. to start all i did was add one line setBackground(Color.green); because the new default is white not gray. i compiled it and jarred the class files but now i get an error

java.lang.UnsupportedClassVersionError: Farm : Unsupported major.minor version 51.0

what is going on?


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Maneesh Godbole
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Joined: Jul 26, 2007
Posts: 10451
    
    8

The error usually indicates that the jdk version which you are using to compile is higher than the jdk/jre version which you are using to run .
e.g. Compile with 1.6 and run with 1.5


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Randall Twede
Ranch Hand

Joined: Oct 21, 2000
Posts: 4347
    
    2

thanks maneesh. that is probably the case. when i run apps from the command line it works fine but evidently the browser is using the older version.

hmmm. not sure what to do here. i do have 2 versions of the jre. the only one that shows up in add/remove programs is java6 update20. i also have java7EE which has the newer jre. i had to set the PATH when i first installed it. firefox is my default browser.

hmmm. apparently i can run it in eclipse if i can figure out how.
 
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subject: UnsupportedClassVersionError