JDK版本不兼容问题（Unsupported major.minor version 49.0）

【环境信息】

1）维护的系统运行在JDK1.4版本下

2）第三方jar包采用（JDK1.4+）编译

 

【异常信息】

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Error 500: LinkageError while defining class: org.gjt.mm.mysql.Driver Could not be defined due to: org/gjt/mm/mysql/Driver (Unsupported major.minor version 49.0) This is often caused by having a class defined at multiple locations within the classloader hierarchy. Other potential causes include compiling against an older or newer version of the class that has an incompatible method signature.

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【异常分析】

编译用的JDK版本比你运行用的JDK版本高，故报此错误！

 

【解决方案】

 1）更换JDK版本，使之编译和运行用的版本一致

 2）注意：若运行的系统是遗留系统，则降低编译用的JDK版本。

 

【扩展阅读】

又是48，49JDK版本不兼容（Unsupported major.minor version 49.0）(系列一)

又是48，49JDK版本不兼容（Unsupported major.minor version 49.0）(系列二)