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Type: Bug
Resolution: Fixed
Priority: Minor
Component/s: workflow-cps-plugin
Labels:
Environment:
Jenkins 2.60 with workflow-job 2.12

We have several cases of "build.xml" that have been generated with no <head> element inside the <execution> element.

This is causing a load failure - which prevents the job expiring.

Load Failure

WARNING: could not load /var/jenkins_home/jobs/<job-path>/builds/18396
java.lang.NullPointerException
        at org.jenkinsci.plugins.workflow.cps.FlowHead.newStartNode(FlowHead.java:97)
        at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.loadProgramFailed(CpsFlowExecution.java:683)
        at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.loadProgramAsync(CpsFlowExecution.java:659)
        at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.onLoad(CpsFlowExecution.java:587)
        at org.jenkinsci.plugins.workflow.job.WorkflowRun.onLoad(WorkflowRun.java:599)
        at hudson.model.RunMap.retrieve(RunMap.java:225)
        at hudson.model.RunMap.retrieve(RunMap.java:57)
        at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:500)
        at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:482)
        at jenkins.model.lazy.AbstractLazyLoadRunMap.getByNumber(AbstractLazyLoadRunMap.java:380)
        at jenkins.model.lazy.AbstractLazyLoadRunMap.search(AbstractLazyLoadRunMap.java:331)
        at jenkins.model.lazy.LazyBuildMixIn$RunMixIn.getNextBuild(LazyBuildMixIn.java:405)
        at org.jenkinsci.plugins.workflow.job.WorkflowRun.getNextBuild(WorkflowRun.java:228)
        at org.jenkinsci.plugins.workflow.job.WorkflowRun.getNextBuild(WorkflowRun.java:129)
        at hudson.tasks.LogRotator.perform(LogRotator.java:147)
        at hudson.model.Job.logRotate(Job.java:465)
        at org.jenkinsci.plugins.workflow.job.WorkflowRun.finish(WorkflowRun.java:663)
        at org.jenkinsci.plugins.workflow.job.WorkflowRun.access$1400(WorkflowRun.java:131)
        at org.jenkinsci.plugins.workflow.job.WorkflowRun$GraphL.onNewHead(WorkflowRun.java:947)
        at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.notifyListeners(CpsFlowExecution.java:1203)
        at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$3.run(CpsThreadGroup.java:407)
        at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.run(CpsVmExecutorService.java:35)
        at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)
        at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
        at java.util.concurrent.Executors$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)

build.xml fragment

<?xml version='1.0' encoding='UTF-8'?>
<flow-build plugin="workflow-job@2.10">
 <execution class="org.jenkinsci.plugins.workflow.cps.CpsFlowExecution">
    <result>SUCCESS</result>
    ... more build information ...
    <script>...
    </script>
    <loadedScripts class="map"/>
    <sandbox>true</sandbox>
    <iota>0</iota>
  </execution>

Note the lack of a <head>0:23</head> or similar tag.

Cause

Unknown.

I have seen this faulty XML generated with both 2.10 and 2.12 versions of the workflow-job plugin. The builds before and after the ones with faulty XML are valid.