Openfire plugins problem

Hi, we have a little problem with our fresh openfire server installed on fresh viritualized debian.

I installed a few plugins throw available plugins in plugins menu. (Sorry but it is so ))))

But I can not see them in plugins installed part of menu.

The log says that openfire cannot load plugins. (806 Bytes)

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java.lang.UnsupportedClassVersionError: org/jivesoftware/openfire/plugin/ClientControlPlugin : Unsupported major.minor version 51.0

Upgrade your java runtime environment (JRE)

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Thank you for the answer !!!

I installed openjdk-7-jre + lib

then sudo update-alternatives --config java but still no luck.

Then apt-get purge openjdk-6*, reboot and it did the thing.