Jenkins does not start on macOS 10.12 (Sierra)

Question

After upgrading my macOS to Sierra, when I start Jenkins using launchctl load I cannot connect to localhost:8080. If I call launchctl load again, I see response \"service alread

Answer 1

I fixed it by setting the appropriate JAVA_HOME variable. The way I diagnosed it was to look at the errors that were thrown as Jenkins was trying to run:

tail -f /var/log/jenkins/jenkins.log

Then I tried to run it:

sudo launchctl load -w /Library/LaunchDaemons/org.jenkins-ci.plist

If it says it's already loaded, unload it first:

sudo launchctl unload /Library/LaunchDaemons/org.jenkins-ci.plist

Then run it:

sudo launchctl load -w /Library/LaunchDaemons/org.jenkins-ci.plist

The error I saw was that Jenkins needed Java 8, not Java 10. So I unloaded:

sudo launchctl unload /Library/LaunchDaemons/org.jenkins-ci.plist

and then installed Java 8. Then I edited the plist file:

sudo nano /Library/LaunchDaemons/org.jenkins-ci.plist

and added the appropriate JAVA_HOME environment variable:

   JENKINS_HOME
   /Users/Shared/Jenkins/Home
   JAVA_HOME
   /Library/Java/JavaVirtualMachines/jdk1.8.0_161.jdk/Contents/Home

Finally, I tried the launchctl command again:

sudo launchctl load -w /Library/LaunchDaemons/org.jenkins-ci.plist

and voilà!