Ok, what am I doing wrong? This is "right outta the box" and a non-starter, 
read docs a few times, but maybe the amount of caffeine affecting my eyes 
... 

I figured I'd start playing around with workflow-plugin to actually code 
... but alas, first quick pass starts throwing ClassCastException ...

Thanks in advance.


Running latest plugin 1.8 on Jenkins 1.619, not doing anything fancy (see 
below), running the job hangs on 

Running: Allocate node : Start
Still waiting to schedule task
Waiting for next available executor


Jenkins logs shows:

Jul 22, 2015 10:57:16 PM SEVERE hudson.triggers.SafeTimerTask run

Timer task hudson.model.Queue$MaintainTask@494e91b4 failed
java.lang.ClassCastException: 
org.jenkinsci.plugins.workflow.support.steps.ExecutorStepExecution$PlaceholderTask
 cannot be cast to hudson.model.AbstractProject
        at 
hudson.plugins.buildblocker.BuildBlockerQueueTaskDispatcher.getBuildBlockerProperty(BuildBlockerQueueTaskDispatcher.java:199)
        at 
hudson.plugins.buildblocker.BuildBlockerQueueTaskDispatcher.canTake(BuildBlockerQueueTaskDispatcher.java:108)
        at hudson.model.Queue$JobOffer.canTake(Queue.java:300)
        at hudson.model.Queue.maintain(Queue.java:1476)
        at hudson.model.Queue$MaintainTask.doRun(Queue.java:2576)
        at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:51)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)


Job config is 

<flow-definition plugin="workflow-job@1.8">

<actions/>
<description/>
<keepDependencies>false</keepDependencies>
<properties>

<hudson.plugins.buildblocker.BuildBlockerProperty plugin=
"build-blocker-plugin@1.7.1">

<useBuildBlocker>false</useBuildBlocker>
<blockLevel>GLOBAL</blockLevel>
<scanQueueFor>DISABLED</scanQueueFor>
<blockingJobs/>
</hudson.plugins.buildblocker.BuildBlockerProperty>
<com.synopsys.arc.jenkins.plugins.ownership.jobs.JobOwnerJobProperty plugin=
"ownership@0.7"/>
<com.sonyericsson.rebuild.RebuildSettings plugin="rebuild@1.25">

<autoRebuild>false</autoRebuild>
<rebuildDisabled>false</rebuildDisabled>
</com.sonyericsson.rebuild.RebuildSettings>
<com.synopsys.arc.jenkinsci.plugins.jobrestrictions.jobs.JobRestrictionProperty 
plugin="job-restrictions@0.4"/>
<jenkins.plugins.slack.SlackNotifier_-SlackJobProperty plugin="slack@1.8">

<teamDomain/>
<token/>
<room/>
<startNotification>false</startNotification>
<notifySuccess>false</notifySuccess>
<notifyAborted>false</notifyAborted>
<notifyNotBuilt>false</notifyNotBuilt>
<notifyUnstable>false</notifyUnstable>
<notifyFailure>false</notifyFailure>
<notifyBackToNormal>false</notifyBackToNormal>
<notifyRepeatedFailure>false</notifyRepeatedFailure>
<includeTestSummary>false</includeTestSummary>
<showCommitList>false</showCommitList>
<includeCustomMessage>false</includeCustomMessage>
<customMessage/>
</jenkins.plugins.slack.SlackNotifier_-SlackJobProperty>
</properties>
<definition class="org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition" 
plugin="workflow-cps@1.8">

<script>node { echo 'hello from Workflow' }</script>
<sandbox>false</sandbox>
</definition>
<triggers/>
</flow-definition>

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