- Ensure you have JSDT installed
- Top Menu -> Eclipse -> About Eclipse -> Installation Details -> Installed Software
- vim $ECLIPSE_PROJECT_ROOT/.project
- To the natures section, add
- Adjust the validation preferences as needed.
- It's usually a good idea to set all of the "Resolution" preferences to ignore.
I couldn't find this documented anywhere on the web, so passing it on here in case it's of use.