The Eclipse plugin is open-source on GitHub.
Add WakaTime to your Eclipse as a new Update Site:
Select Help → Install New Software…, then enter this url and hit Enter:
https://raw.githubusercontent.com/wakatime/eclipse-wakatime/master/update-site/
Check the WakaTime package, then click Next and proceed with the wizard to install the plugin.
Click File → WakaTime → API Key, enter your API key
, then click OK.
Use Eclipse and your coding activity will be displayed on your WakaTime Dashboard.
Inside Eclipse select Help → Check for Updates.
Inside Eclipse, select Help → About.
Click Installation Details button.
Select WakaTime from the list and press Uninstall… button and confirm the uninstalling by click Finish.
Re-launch Eclipse.