I have the following declarative pipeline. It defines checkbox multi-choice parameter:

pipeline {
    agent any 
    options {
    parameters { 
        extendedChoice description: '', multiSelectDelimiter: ',', name: 'NAMES', quoteValue: false, saveJSONParameterToFile: false, type: 'PT_CHECKBOX', value:'a,b,c', visibleItemCount: 3
    stages {
      stage('Run on all') {

        steps { 
            script {
                  println params.NAMES 


My goal is to call the pipeline via Jenkins CLI where passed values to NAMES parameter signifies selected checkboxes.

Running java -jar jenkins-cli.jar -s http://localhost:8080 -auth u:p -p NAMES='a' causes empty string to be printed by println params.NAMES

Expected a to be printed after calling the pipeline via Jenkins cli client.

The only way that worked is adding commas after a: java -jar jenkins-cli.jar -s http://localhost:8080 -auth u:p -p NAMES='a,,'

Is it the correct syntax to pass checkbox selections of extendedChoice type parameter?

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