Currently when first running Docear on MacOS (El Captain for me) the following warning shows after first installation.

Raising issue to prioritise getting Java updated.
Ref: http://www.infoworld.com/article/2610229/java/java-s-security-dilemma--old--vulnerable-versions-won-t-go-away.html
Edit: According to this it seems like it's not a security threat currently to install on El Captain. https://discussions.apple.com/thread/7708885?start=0&tstart=0