How to use a parameter from NodeLabelParameter Plugin with the "build" step of Jenkins Workflow

Question

I have a job that take a "Node" parameter provided by the NodeLabelParameter plugin, and I would like to call it from a jenkins "Workflow" job, via the "build" step.

When I use the Snippet Generator with "Build a job", the generated code is :

build job: 'test job', parameters: [<object of type org.jvnet.jenkins.plugins.nodelabelparameter.NodeParameterValue>]

Of course this is not valid.

I tried this (I found this constructor in the NodeLabelParameter plugin code):

build job: 'test job', parameters: [[new org.jvnet.jenkins.plugins.nodelabelparameter.NodeParameterValue('UPSTREAM_NODE', '', 'my_node')]]

But the build fails with this exception :

java.lang.ClassCastException: org.jenkinsci.plugins.workflow.support.steps.build.BuildTriggerStep.parameters expects class hudson.model.ParameterValue but received class java.util.ArrayList
at org.jenkinsci.plugins.workflow.structs.DescribableHelper.coerce(DescribableHelper.java:250)
...

What is the correct syntax to use such a parameter from a workflow job ?

Thanks

Answer 1

The exception is because you have an extraneous set of square brackets. Try

build job: 'test job', parameters: [new org.jvnet.jenkins.plugins.nodelabelparameter.NodeParameterValue('UPSTREAM_NODE', '', 'my_node')]

However the preferred syntax is something like

build job: 'test job', parameters: [[$class: 'NodeParameterValue', name: 'UPSTREAM_NODE', labels: ['my_node'], nodeEligibility: [$class: 'AllNodeEligibility']]]

which is what I would expect the Snippet Generator to produce, assuming you are running Workflow version 1.3 or higher with this fix. If you are, and the Snippet Generator still fails to produce valid code, please file a bug report.