[JENKINS-69621] P4 trigger cause ClassCastException in multi-configuration projects #735
Description
I have two jobs running side by side, a "Freestyle" job and a Matrix or "Multi-Configuration Project" (MCP) configured to do the same simple tasks. For both jobs after a Perforce trigger is received, the jobs will execute a P4-sync of the workspace, then use Powershell to Write-Output a simple message, and finally make a Slack notification.
When a P4 trigger is received the Freestyle job executes as expected. However after the Matrix/MCP job is notified by the same trigger event, it seems unable to process that a change has taken place and never starts the P4-sync or other steps.
By examining the jenkins.err.log I can see an exception is being thrown when Jenkins tries to process the job.
2022-09-15 17:29:26.301+0000 [id=12008] WARNING h.p.b.g.GlobalTimeOutConfiguration#timeOutFor: Tests_P4Trigger_NameVars#1 cannot allow individual jobs to overwrite timeout due to ClassCastException java.lang.ClassCastException: class hudson.matrix.MatrixProject cannot be cast to class hudson.model.Project (hudson.matrix.MatrixProject is in unnamed module of loader jenkins.util.URLClassLoader2 @ab11188; hudson.model.Project is in unnamed module of loader org.eclipse.jetty.webapp.WebAppClassLoader @33bc72d1) at hudson.plugins.build_timeout.global.GlobalTimeOutConfiguration.timeOutFor(GlobalTimeOutConfiguration.java:91) at hudson.plugins.build_timeout.global.GlobalTimeOutRunListener.setUpEnvironment(GlobalTimeOutRunListener.java:43) at hudson.model.AbstractBuild$AbstractBuildExecution.createLauncher(AbstractBuild.java:615) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:483) at hudson.model.Run.execute(Run.java:1899) at hudson.matrix.MatrixBuild.run(MatrixBuild.java:323) at hudson.model.ResourceController.execute(ResourceController.java:107) at hudson.model.Executor.run(Executor.java:449) 2022-09-15 17:29:27.342+0000 [id=12008] INFO o.j.p.p.w.ManualWorkspaceImpl#setClient: P4: Creating manual client: jenkins-built-in-Tests_P4Trigger_NameVars--1 2022-09-15 17:29:27.353+0000 [id=73] INFO o.j.p.p.w.ManualWorkspaceImpl#setClient: P4: Creating manual client: jenkins-BP-JNKND-VS19-6-Tests_P4Trigger_SlackPost-0 2022-09-15 17:29:27.602+0000 [id=11722] INFO o.j.plugins.p4.trigger.P4Hook#probeJobs: P4: probing: DAFI_7-66-SIEI_CLI_VS19
Note the Matrix/MCP job will run successfully if started manually or by a timer. The job only fails after it receives a P4 trigger event.
Reproducibility: Always
Steps to Reproduce:
- Setup a Jenkins server to receive P4 Triggers.
- Setup a Perforce server that triggers a Jenkins server.
- Create a Matrix/MCP project that has a workspace mapping from the Perforce server.
- Use the Manual P4 trigger to run job for the first time.
- Note the first run will work.
- Next submit a change in the Perforce server that will send a trigger to the Jenkins server.
Result:
Jenkins will receive the P4 Trigger, but during the processing of the job the exception above will be thrown, and the Matrix/MCP job will not execute.
Expected Result:
That a Matrix/MCP job would function like a Freestyle job. When a P4 trigger is received the required processing would not throw an exception and instead continue through all the steps.
Originally reported by 
jgorden_sie, imported from: P4 trigger cause ClassCastException in multi-configuration projects
- assignee:
kohsuke
- status: Open
- priority: Minor
- component(s): matrix-project-plugin
- label(s): classcastexception, matrix-project
- resolution: Unresolved
- votes: 0
- watchers: 2
- imported: 2025-12-06
Raw content of original issue
I have two jobs running side by side, a "Freestyle" job and a Matrix or "Multi-Configuration Project" (MCP) configured to do the same simple tasks. For both jobs after a Perforce trigger is received, the jobs will execute a P4-sync of the workspace, then use Powershell to Write-Output a simple message, and finally make a Slack notification.
When a P4 trigger is received the Freestyle job executes as expected. However after the Matrix/MCP job is notified by the same trigger event, it seems unable to process that a change has taken place and never starts the P4-sync or other steps.
By examining the jenkins.err.log I can see an exception is being thrown when Jenkins tries to process the job.
jenkins.err.log2022-09-15 17:29:26.301+0000 [id=12008] WARNING h.p.b.g.GlobalTimeOutConfiguration#timeOutFor: Tests_P4Trigger_NameVars#1 cannot allow individual jobs to overwrite timeout due to ClassCastException java.lang.ClassCastException: class hudson.matrix.MatrixProject cannot be cast to class hudson.model.Project (hudson.matrix.MatrixProject is in unnamed module of loader jenkins.util.URLClassLoader2 @ab11188; hudson.model.Project is in unnamed module of loader org.eclipse.jetty.webapp.WebAppClassLoader @33bc72d1) at hudson.plugins.build_timeout.global.GlobalTimeOutConfiguration.timeOutFor(GlobalTimeOutConfiguration.java:91) at hudson.plugins.build_timeout.global.GlobalTimeOutRunListener.setUpEnvironment(GlobalTimeOutRunListener.java:43) at hudson.model.AbstractBuild$AbstractBuildExecution.createLauncher(AbstractBuild.java:615) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:483) at hudson.model.Run.execute(Run.java:1899) at hudson.matrix.MatrixBuild.run(MatrixBuild.java:323) at hudson.model.ResourceController.execute(ResourceController.java:107) at hudson.model.Executor.run(Executor.java:449) 2022-09-15 17:29:27.342+0000 [id=12008] INFO o.j.p.p.w.ManualWorkspaceImpl#setClient: P4: Creating manual client: jenkins-built-in-Tests_P4Trigger_NameVars--1 2022-09-15 17:29:27.353+0000 [id=73] INFO o.j.p.p.w.ManualWorkspaceImpl#setClient: P4: Creating manual client: jenkins-BP-JNKND-VS19-6-Tests_P4Trigger_SlackPost-0 2022-09-15 17:29:27.602+0000 [id=11722] INFO o.j.plugins.p4.trigger.P4Hook#probeJobs: P4: probing: DAFI_7-66-SIEI_CLI_VS19Note the Matrix/MCP job will run successfully if started manually or by a timer. The job only fails after it receives a P4 trigger event.
Reproducibility: Always
Steps to Reproduce:
- Setup a Jenkins server to receive P4 Triggers.
- Setup a Perforce server that triggers a Jenkins server.
- Create a Matrix/MCP project that has a workspace mapping from the Perforce server.
- Use the Manual P4 trigger to run job for the first time.
- Note the first run will work.
- Next submit a change in the Perforce server that will send a trigger to the Jenkins server.
Result: Jenkins will receive the P4 Trigger, but during the processing of the job the exception above will be thrown, and the Matrix/MCP job will not execute.
Expected Result: That a Matrix/MCP job would function like a Freestyle job. When a P4 trigger is received the required processing would not throw an exception and instead continue through all the steps.
environment
Jenkins: 2.361.1<br/>
OS: Windows Server 2019 - 10.0<br/>
---<br/>
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