Under OS X 10.9 Jenkins CI was being automatically started by launchd. After update to 10.10, it is no longer being started. Jenkins was installed using the OS X installer from jenkins-ci.org. I was running v1.584. After this problem surfaced I reinstalled using v1.585 to no avail. There is no output in the log file specified in org.jenkins-ci.plist. Syslog has several messages indicating that the