How do I reinstall the DataNucleus plugin in Eclipse?

I installed the DataNucleus 开发者_JAVA技巧plugin in my installation of Eclipse. How do I remove and reinstall the plugin?

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Inside Eclipse

go to Winows->preference on left side panel check for Install/Update->Available Software click on the plugin and right side click on remove this will remove the plugin .

In order to reinstall click on Add button and the url of the plugin site and click , if it is compatible with the version of eclipse working , else it will display error

Hope this helps

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Inside Eclipse (Helios)

Go to Help > Install New Software Click on 'What is already installed?" link. Select plugin and click Uninstall...

The suggested alternative of Windows > Preferences > Install/Update > Avail Software Sites > Remove doesn't remove the plugin - only the site.