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Bug
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Resolution: Won't Fix
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Major
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None
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Jenkins 1.620
multiple-scms 0.4
mercurial 1.54
template-project 1.4.2
Jobs which uses 1 Mercurial + 3 Git repositories (via Use SCM from another project template plugin's option) often failing with below error. If I restart job without any changes it building ok. So error is not happening all the time, but still happens often enough. I don't see such errors in other jobs which using multiple Mercurial repos or multiple Git repos. We only recently created jobs which need mix of Mercurial and Git repos, I haven’t seen such error before. It happening on different linux and windows slaves.
For Mercurial repository caching and sharing are enabled.
It looks like it depends on slave load - when slave is not doing anything job is running ok, when there are other jobs running on slave, job is failing.
Deleting project workspace... done
FATAL: hudson.plugins.mercurial.MercurialTagAction cannot be cast to org.jenkinsci.plugins.multiplescms.MultiSCMRevisionState
java.lang.ClassCastException: hudson.plugins.mercurial.MercurialTagAction cannot be cast to org.jenkinsci.plugins.multiplescms.MultiSCMRevisionState
at org.jenkinsci.plugins.multiplescms.MultiSCM.checkout(MultiSCM.java:106)
at hudson.scm.SCM.checkout(SCM.java:485)
at hudson.plugins.templateproject.ProxySCM.checkout(ProxySCM.java:53)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1282)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:610)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:532)
at hudson.model.Run.execute(Run.java:1741)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:381)
Archiving artifacts
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- Closed
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[JENKINS-29425] Multiple SCM + Mercurial + Git
Igor Kostenko
added a comment - I had to get rid of git+mercurial mix, and for fixing below exception I have to always explicitly specify repository browser. In case multiple scm there is only one available choice: auto, so I'm manually modifying job xml.
FATAL: org.jenkinsci.plugins.multiplescms.MultiSCMRevisionState cannot be cast to hudson.plugins.mercurial.MercurialTagAction
java.lang.ClassCastException: org.jenkinsci.plugins.multiplescms.MultiSCMRevisionState cannot be cast to hudson.plugins.mercurial.MercurialTagAction
at hudson.plugins.mercurial.MercurialSCM.determineChanges(MercurialSCM.java:612)
at hudson.plugins.mercurial.MercurialSCM.checkout(MercurialSCM.java:561)
at hudson.scm.SCM.checkout(SCM.java:485)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1282)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:610)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:532)
at hudson.model.Run.execute(Run.java:1741)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:381)
Igor Kostenko
added a comment - I had to get rid of git+mercurial mix, and for fixing below exception I have to always explicitly specify repository browser. In case multiple scm there is only one available choice: auto, so I'm manually modifying job xml.
FATAL: org.jenkinsci.plugins.multiplescms.MultiSCMRevisionState cannot be cast to hudson.plugins.mercurial.MercurialTagAction
java.lang.ClassCastException: org.jenkinsci.plugins.multiplescms.MultiSCMRevisionState cannot be cast to hudson.plugins.mercurial.MercurialTagAction
at hudson.plugins.mercurial.MercurialSCM.determineChanges(MercurialSCM.java:612)
at hudson.plugins.mercurial.MercurialSCM.checkout(MercurialSCM.java:561)
at hudson.scm.SCM.checkout(SCM.java:485)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1282)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:610)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:532)
at hudson.model.Run.execute(Run.java:1741)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:381) Sounds similar to JENKINS-27638, supposedly fixed in 0.5.
In general, the Mercurial plugin does not claim to support Multiple SCMs and does not test with it. Your mileage may vary.
(Multiple checkouts are supported from a Workflow build. Freestyle projects were never designed to support this, hence the hacks in Multiple SCMs.)
Brantone
added a comment - With JENKINS-27638 closed and new release of template-project, if still reproducible then as stated: "mileage may vary"
Brantone
added a comment - With JENKINS-27638 closed and new release of template-project, if still reproducible then as stated: "mileage may vary" 
Craig Rodrigues
added a comment - Suggest that you migrate to Pipeline plugin, which offers a supported way of checking out from multiple scms
https://wiki.jenkins-ci.org/display/JENKINS/Pipeline+Plugin
Craig Rodrigues
added a comment - Suggest that you migrate to Pipeline plugin, which offers a supported way of checking out from multiple scms
https://wiki.jenkins-ci.org/display/JENKINS/Pipeline+Plugin 
I've updated multiple-scms to 0.5, and now I'm getting below error a lot: have to restart build many times before it started properly.
Deleting project workspace... done
FATAL: null
java.lang.NullPointerException
at hudson.plugins.templateproject.ProxySCM.checkout(ProxySCM.java:53)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1282)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:610)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:532)
at hudson.model.Run.execute(Run.java:1741)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:381)