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Asked: 2026-06-08T20:30:40+00:00

Possible Duplicate: Exception in thread “main” java.lang.UnsupportedClassVersionError: a (Unsupporte d major.minor version 51.0) I

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Possible Duplicate:
Exception in thread “main” java.lang.UnsupportedClassVersionError: a (Unsupporte d major.minor version 51.0)

I have been using Eclipse with jre 1.7.x and jdk 1.7.x before and I had to downgrade to 1.6x.

The way that I downgraded was to uninstall all the 1.7 related from my computer and install 1.6 again.

Now, when I try to debug, I am getting 

`java.lang.UnsupportedClassVersionError: MyClass: Unsupported major.minor version 51.0`

I checked the version of JRE and JDK that used to compiled, both of them are 1.6.

Can anyone help with this?

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1 Answer

  1. Editorial Team
    java.lang.UnsupportedClassVersionError: `Unsupported major.minor version 51.0`

    Your runtime version is different from compile time version.

    Make sure JAVA_HOME variables etc., to make sure compile and runtime both pointing to same version.

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