Pipeline: Fails reading build cause

[Sverre Moe]

I have tried reading the build cause as suggested in this example
https://github.com/jenkinsci/pipeline-examples/tree/master/pipeline-examples/get-build-cause

Accessing the build cause outside of a node causes the pipeline to fail 
right after entering the first stage and without an error or exception.
void main(def args) {
  def causes = currentBuild.rawBuild.getCauses()
  stage 'Checkout'
  node {
    scm checkout
  }
}


Accessing the build cause within a node throws exception 
java.io.NotSerializableException: 
hudson.model.Cause$UserIdCause
void main(def args) {
  stage 'Checkout'
  node {
    def causes = currentBuild.rawBuild.getCauses()
    scm checkout
  }
}


So I put it within a @NonCPS method, but it still fails the same way as 
before.
void main(def args) {
stage 'Checkout'
node {
  def cause = getLastBuildCause()
scm checkout
}
}

@NonCPS
def getLastBuildCause() {
    def causes = currentBuild.rawBuild.getCauses()
    return causes.last()
}

 
I need to find out who or what caused the build, to find out if it is an 
upstream project. Unless there is some other access methods for this?

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