UnsupportedClassVersionError java

Question

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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?

Did you do a clean build of the Eclipse project after downgrading Java? — Adam Paynter, Jul 31 '12 at 20:37

score 2 · Accepted Answer · answered Jul 31 '12 at 20:36

2

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.

answered Jul 31 '12 at 20:36

kosa

score 0 · Answer 2 · edited May 23 '17 at 12:29

0

you compiled code with 1.7 and debugging with 1.6

edited May 23 '17 at 12:29

Community

answered Jul 31 '12 at 20:38

Andrey Borisov

2 Answers2