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

https://crunchify.com/exception-in-thread-main-java-lang-unsupportedclassversionerror-comcrunchifymain-unsupported-major-minor-version-51-0/

完美解决！！！！

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

Javaa Error Message

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java.lang.UnsupportedClassVersionError:com.crunchify.testClass:

Unsupportedmajor.minorversion51.0

    atjava.lang.ClassLoader.defineClass1(NativeMethod)

    atjava.lang.ClassLoader.defineClassCond(UnknownSource)

      .........................................

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?

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

And that’s all.

Java Version and Versions

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J2SE8=52,

J2SE7=51,

J2SE6.0=50,

J2SE5.0=49,

JDK1.4=48,

JDK1.3=47,

JDK1.2=46,

JDK1.1=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!