The plugin includes an action set that makes stopping and restarting jetty instances easier.
To add the action set to the current perspective, go to Window->Customize Perspective and select "Other" and "Jetty Launcher Actions"
A Jetty action will appear on the toolbar.
If no Jetty instance is running, then clicking on the button will do nothing.
Selecting the dropdown option of the action allows one to choose whther to stop and remove or to stop and restart any Jetty instances that are running.