I'm trying create jobs to run in parallel in a workflow with this script:

def branches = [:]
def jobs = [ 'job-1' ]
for (job in jobs) {
    branches[job] = { build job: job }
}
parallel branches

This fails with the below (though it doesn't fail when 'parallel branches' 
is commented out).

How can this be done?

Thanks,
David

Running: Execute sub-workflows in parallel : Start
[job-1] Running: Parallel branch: job-1
[job-1] Running: Build a Job
[job-1] Starting building project: job-1
Running: Execute sub-workflows in parallel : Body : End
Running: End of Workflow
java.io.NotSerializableException: java.util.ArrayList$Itr
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:860)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
        at 
org.jboss.marshalling.river.BlockMarshaller.doWriteObject(BlockMarshaller.java:65)
        at 
org.jboss.marshalling.river.BlockMarshaller.writeObject(BlockMarshaller.java:56)
        at 
org.jboss.marshalling.MarshallerObjectOutputStream.writeObjectOverride(MarshallerObjectOutputStream.java:50)
        at 
org.jboss.marshalling.river.RiverObjectOutputStream.writeObjectOverride(RiverObjectOutputStream.java:179)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344)
        at java.util.HashMap.internalWriteEntries(HashMap.java:1777)
        at java.util.HashMap.writeObject(HashMap.java:1354)
        at sun.reflect.GeneratedMethodAccessor144.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at 
org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
        at 
org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
        at 
org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58)
        at 
org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111)
        at 
org.jenkinsci.plugins.workflow.support.pickles.serialization.RiverWriter.writeObject(RiverWriter.java:133)
        at 
org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.saveProgram(CpsThreadGroup.java:344)
        at 
org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.saveProgram(CpsThreadGroup.java:328)
        at 
org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:303)
        at 
org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$000(CpsThreadGroup.java:71)
        at 
org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:180)
        at 
org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:178)
        at 
org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:47)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        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)
Caused by: an exception which occurred:
        in field itr
        in field target
        in field continue_
        in field parent
        in field capture
        in field def
        in field closures
        in object org.jenkinsci.plugins.workflow.cps.CpsThreadGroup@2dbe3b3c
Finished: FAILURE


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