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Therefore, unless your hard disk storage capacity is extraordinarily limited, it is recommended that you simply leave the physical files in place. If you remove the wrong files from these directories, you may have quite some trouble restoring your Eclipse to a stable state. Be very cautious as to which files you delete, and always have a backup of your Eclipse directory. In order to do, you will have to manually remove the files there associated with the feature from the eclipse/features directory and its plug-ins from the eclipse/plugins directory. The process to physically and permanently remove an undesirable feature and its plug-ins is a manual process that should be done when Eclipse is not running.
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There is no mechanism within Eclipse to permanently and physically uninstall a feature and its plug-ins. They are still available on disk, and they can be enabled at any When a feature is disabled, all its plug-ins will be disabled also. These steps are using the Update Manager under the covers. 'Uninstalling' a feature, using the steps above, disable the feature or plug-in. Select the feature of interest, and disable it with the task shown in the right window. Help > Software Updates > Manage Configuration., (On Macintosh it is Eclipse > About Eclipse > Installation Details.) Select the software you no longer want and click Uninstall. Run Help > About Eclipse > Installation Details,
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In some cases, Eclipse doesn't support uninstalling certain 'optional' features after they have been installed. Depending upon the particular version of Eclipse you are running with, the difficulty of uninstalling features or plugins from an Eclipse installation ranges from trivial to painful.
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