Exception in thread “main” java.lang.UnsupportedClassVersionError: com/crunchify/Main : Unsupported

最新推荐文章于 2023-08-23 23:48:22 发布

xiaoxik

最新推荐文章于 2023-08-23 23:48:22 发布

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分类专栏：错误统计环境配置

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本文解决了在Linux环境下运行Java应用程序时遇到的UnsupportedClassVersionError错误。原因是编译时使用了较高版本的JDK（版本7），而在运行时使用了较低版本的JDK（版本6）。解决方案包括调整项目的编译器合规级别到1.6或1.5，并重新构建应用。此外，还可以考虑将所需JVM与应用程序捆绑在一起，并从启动脚本中设置JAVA_HOME。

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完美解决！！！！

Recently I faced this wired exception while running my Java application on Linux environment.

Javaa Error Message 
  
 
 
 
  
         1 
       

         2 
       

         3 
       

         4 
       

         5 
       
 
        java 
        . 
        lang 
        . 
        UnsupportedClassVersionError 
        : 
          
        com 
        . 
        crunchify 
        . 
        testClass 
          
        : 
       
 
         
        Unsupported  
        major 
        . 
        minor  
        version 
          
        51.0 
       
 
             
        at  
        java 
        . 
        lang 
        . 
        ClassLoader 
        . 
        defineClass1 
        ( 
        Native 
          
        Method 
        ) 
       
 
             
        at  
        java 
        . 
        lang 
        . 
        ClassLoader 
        . 
        defineClassCond 
        ( 
        Unknown  
        Source 
        ) 
       
 
                
        . 
        . 
        . 
        . 
        . 
        . 
        . 
        . 
        . 
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        . 
       
 
 

The only difference I noticed in about Java Version. I compiled all code on my laptop with version 7 and Linux had version 6. java.lang.UnsupportedClassVersionError happens because of a higher JDK during compile time and lower JDK during runtime.

Now how to solve it?

Project -> Properties -> Java Compiler
Enable project specific settings.
Then select Compiler Compliance Level to 1.6 or 1.5, build and test your app.

And that’s all.

Java Version and Versions 
  
         1 
       
         2 
       
         3 
       
         4 
       
         5 
       
         6 
       
         7 
       
         8 
       
        J2SE 
          
        8 
        = 
        52 
        , 
       
        J2SE 
          
        7 
        = 
        51 
        , 
       
        J2SE 
          
        6.0 
        = 
        50 
        , 
       
        J2SE 
          
        5.0 
        = 
        49 
        , 
       
        JDK 
          
        1.4 
        = 
        48 
        , 
       
        JDK 
          
        1.3 
        = 
        47 
        , 
       
        JDK 
          
        1.2 
        = 
        46 
        , 
       
        JDK 
          
        1.1 
        = 
        45

The version numbers mentioned above are the version of the JRE the class file is compatible with. There is another way to fix this problem – try bundling your own required JVM with your application and set JAVA_HOME from your startup.shscript.

Would love to know what you think. Chime in and share it as a comment. Don’t forget to share this guide!