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Bug
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Resolution: Fixed
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Major
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None
When a new branch is discovered by multibranch, it fails due to a missing commit (which is actually there in github). Re-running the build subsequently fixes this.
The stack trace should be informative (this is from the job: https://ci.blueocean.io/job/blueocean/job/bug%252FJENKINS-39627-buttonbarlayout/1/console):
GitHub has been notified of this commit’s build result hudson.plugins.git.GitException: org.eclipse.jgit.errors.MissingObjectException: Missing commit afbbb05dc881da89e63c5901e94f333deaeaf020 at org.jenkinsci.plugins.gitclient.JGitAPIImpl$4.includes(JGitAPIImpl.java:1020) at io.jenkins.blueocean.autofavorite.FavoritingScmListener.onCheckout(FavoritingScmListener.java:58) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:123) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:83) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:73) at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:52) at hudson.security.ACL.impersonate(ACL.java:213) at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:49) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: org.eclipse.jgit.errors.MissingObjectException: Missing commit afbbb05dc881da89e63c5901e94f333deaeaf020 at org.eclipse.jgit.internal.storage.file.WindowCursor.open(WindowCursor.java:159) at org.eclipse.jgit.revwalk.RevWalk.getCachedBytes(RevWalk.java:903) at org.eclipse.jgit.revwalk.RevCommit.parseHeaders(RevCommit.java:155) at org.eclipse.jgit.revwalk.RevWalk.markStart(RevWalk.java:293) at org.jenkinsci.plugins.gitclient.JGitAPIImpl$4.includes(JGitAPIImpl.java:1016) ... 12 more Finished: FAILURE
Yay for dogfooding for picking this up 
- blocks
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- Closed
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[JENKINS-39704] Autofavouriting breaks first build of a new job/branch
riusaqua does it actually fail the first run? This code is incredibly defensive - you should receive logging warnings but never a failed run. What version of the plugin are you on?
sergey zavadski
added a comment - yes, it fails every first build of a branch it has not seen (in a multibranch pipeline project with github as scm), with the exception trace that has been posted above
this is what in the bottom of my blue ocean dashboard:
1.3.5 · Core 2.99 · b09ca18 · 11th December 2017 10:11 PM
let me know if you need anything else
sergey zavadski
added a comment - yes, it fails every first build of a branch it has not seen (in a multibranch pipeline project with github as scm), with the exception trace that has been posted above
this is what in the bottom of my blue ocean dashboard:
1.3.5 · Core 2.99 · b09ca18 · 11th December 2017 10:11 PM
let me know if you need anything else sergey zavadski
added a comment - Is there any workaround for this? Perhaps some groovy script that can be executed through script console to disable this feature?
sergey zavadski
added a comment - Is there any workaround for this? Perhaps some groovy script that can be executed through script console to disable this feature? sergey zavadski
added a comment - I see this in autofavoriting code:
{{ // If the user has disabled auto-favoriting then we should bail out}}
{{ if (!FavoritingUserProperty.from(author).isAutofavoriteEnabled()) {}}
{{ return;}}
{{ }}}
How do I disable autofavoriting? I see no configuration options in Jenkins configuration UI
sergey zavadski
added a comment - I see this in autofavoriting code:
{{ // If the user has disabled auto-favoriting then we should bail out}}
{{ if (!FavoritingUserProperty.from(author).isAutofavoriteEnabled()) {}}
{{ return;}}
{{ }}}
How do I disable autofavoriting? I see no configuration options in Jenkins configuration UI riusaqua -DBLUEOCEAN_FEATURE_AUTOFAVORITE_ENABLED=false will disable it when you start up (if you have the latest autofav plugin installed - which you may not)
sergey zavadski
added a comment - Thanks, fix confirmed sergey zavadski
added a comment - FYI: after adding this flag to startup options autoscrolling of shell output in pipeline steps stopped working. It is not as critical as the initial issue though
sergey zavadski
added a comment - FYI: after adding this flag to startup options autoscrolling of shell output in pipeline steps stopped working. It is not as critical as the initial issue though riusaqua that wouldn't be related at all other than by coincidence with some other glitch.
Is there a workaround for this?
This issue renders blue ocean, that is otherwise awesome, completely useless, as any new pull request build fails (we are using multibranchworkflow project as a top level folder)