Spring Boot 1.4.0.M3 发布了，本次发布修复了将近150个问题，以及增加了一些新的功能，具体如下：
Lots of bug fixes and improvements over M2 (thanks to everyone for trying the milestones).
Convention based error pages (want a custom 404, just add
src/main/resources/public/error/404.html).Improved ErrorPage registration support.
Support for pluggable OAuth2 Principal extraction.
详细文档，可以在这里查看。