I just copied a plugin directory into the plugins folder of eclipse, But when i restarted eclipse it's not loading up the plugin, Please what settings parameter can i start eclipse with, so it can automatically load new plugins
Copying plugin from another eclipse folder doesn't guarantee that it works. In this way doesn't check compatibility of plugin version and Eclipse version. and still if Eclipse version is same then please copy features folder also.
Use zipped plugins and install them through Eclipse -> Software Update -> Find & Install.