[JENKINS-57288] NoClassDefFoundError on SingleConditionalBuilder

After upgrading Jenkins from 2.89.3 to 2.164.2 and then upgrading the Conditional Build step plugin to 1.3.6, we started seeing the following error whenever a Jenkins job is triggered using "Poll SCM".

FATAL: org/jenkinsci/plugins/conditionalbuildstep/singlestep/SingleConditionalBuilder

java.lang.NoClassDefFoundError: org/jenkinsci/plugins/conditionalbuildstep/singlestep/SingleConditionalBuilder

at com.microfocus.application.automation.tools.octane.model.processors.projects.AbstractProjectProcessor.builderClassValidator(AbstractProjectProcessor.java:189)

at com.microfocus.application.automation.tools.octane.model.processors.projects.AbstractProjectProcessor.processBuilders(AbstractProjectProcessor.java:145)

at com.microfocus.application.automation.tools.octane.model.processors.projects.AbstractProjectProcessor.processBuilders(AbstractProjectProcessor.java:131)

at com.microfocus.application.automation.tools.octane.model.processors.projects.FreeStyleProjectProcessor.(FreeStyleProjectProcessor.java:40)

at com.microfocus.application.automation.tools.octane.model.processors.projects.JobProcessorFactory.getFlowProcessor(JobProcessorFactory.java:68)

at com.microfocus.application.automation.tools.octane.model.processors.projects.JobProcessorFactory.getFlowProcessor(JobProcessorFactory.java:60)

at com.microfocus.application.automation.tools.octane.tests.build.BuildHandlerUtils.getJobCiId(BuildHandlerUtils.java:138)

at com.microfocus.application.automation.tools.octane.model.CIEventFactory.createScmEvent(CIEventFactory.java:70)

at com.microfocus.application.automation.tools.octane.events.SCMListenerOctaneImpl.onChangeLogParsed(SCMListenerOctaneImpl.java:44)

at hudson.model.listeners.SCMListener.onChangeLogParsed(SCMListener.java:120)

at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:590)

at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)

at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)

at hudson.model.Run.execute(Run.java:1816)

at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)

at hudson.model.ResourceController.execute(ResourceController.java:97)

at hudson.model.Executor.run(Executor.java:429)

 

I then downgraded the Conditional Build Step plugin to 1.3.5, but we are still seeing this error.  

If we run the job manually it succeeds.

---
Originally reported by calvinmichel, imported from: NoClassDefFoundError on SingleConditionalBuilder

• assignee: domi
  
• status: Open
  
• priority: Major
  
• component(s): conditional-buildstep-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 1
  
• imported: 20260107-133739
  

Raw content of original issue

After upgrading Jenkins from 2.89.3 to 2.164.2 and then upgrading the Conditional Build step plugin to 1.3.6, we started seeing the following error whenever a Jenkins job is triggered using "Poll SCM".


FATAL: org/jenkinsci/plugins/conditionalbuildstep/singlestep/SingleConditionalBuilder

java.lang.NoClassDefFoundError: org/jenkinsci/plugins/conditionalbuildstep/singlestep/SingleConditionalBuilder

 at com.microfocus.application.automation.tools.octane.model.processors.projects.AbstractProjectProcessor.builderClassValidator(AbstractProjectProcessor.java:189)

 at com.microfocus.application.automation.tools.octane.model.processors.projects.AbstractProjectProcessor.processBuilders(AbstractProjectProcessor.java:145)

 at com.microfocus.application.automation.tools.octane.model.processors.projects.AbstractProjectProcessor.processBuilders(AbstractProjectProcessor.java:131)

 at com.microfocus.application.automation.tools.octane.model.processors.projects.FreeStyleProjectProcessor.<init>(FreeStyleProjectProcessor.java:40)

 at com.microfocus.application.automation.tools.octane.model.processors.projects.JobProcessorFactory.getFlowProcessor(JobProcessorFactory.java:68)

 at com.microfocus.application.automation.tools.octane.model.processors.projects.JobProcessorFactory.getFlowProcessor(JobProcessorFactory.java:60)

 at com.microfocus.application.automation.tools.octane.tests.build.BuildHandlerUtils.getJobCiId(BuildHandlerUtils.java:138)

 at com.microfocus.application.automation.tools.octane.model.CIEventFactory.createScmEvent(CIEventFactory.java:70)

 at com.microfocus.application.automation.tools.octane.events.SCMListenerOctaneImpl.onChangeLogParsed(SCMListenerOctaneImpl.java:44)

 at hudson.model.listeners.SCMListener.onChangeLogParsed(SCMListener.java:120)

 at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:590)

 at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)

 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)

 at hudson.model.Run.execute(Run.java:1816)

 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)

 at hudson.model.ResourceController.execute(ResourceController.java:97)

 at hudson.model.Executor.run(Executor.java:429)


 


I then downgraded the Conditional Build Step plugin to 1.3.5, but we are still seeing this error.  


If we run the job manually it succeeds.

environment

```
Jenkins 2.164.2

Conditional Build Step 1.3.5

Token Macro 2.3

```