Are you using the right mysql jdbc jar? Or did you try to recreate the jar by editing some of the classes? java.lang,IncompatibleClassChangeError is thrown when something about a class is different from the bytecode that is accessing it. The jdbc jar can be put in any of the following locations :
- glassfish/lib
- glassfish/domains/domain1/lib
- glassfish/domains/domain1/lib/ext
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