Package.activateConfig is deprecated.

[florinbroasca]

Use a config schema instead. See the configuration section
of https://atom.io/docs/latest/hacking-atom-package-word-count and
https://atom.io/docs/api/latest/Config for more details

Package.activateConfig (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:267:11)
Package.activateNow (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:238:14)
<unknown> (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:223:30)
Package.measure (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:167:15)

[brampersandon]

This is repaired in PR #15. Please review and apply to your own repository at your leisure :)
If you like, you can also use my fork of this repo, which doesn't exhibit these issues: git clone https://github.com/skylineproject/linter-javac.git ~/.atom/packages/linter-javac

[kevinsawicki]

Fixed by #15