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When I preverify my classes, I get the message “Class loading error: Bad major version number”. Why?

April 26, 2017bad class classes Error loading message version

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When I preverify my classes, I get the message “Class loading error: Bad major version number”. Why?

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My guess is that you’re using JDK version 1.4 or higher. The problem is that the byte code format generated by the 1.4 and later compiler is incompatible with earlier versions of the preverify executable that you’re using.