Jenkinsfile Example with Parameterized Environment and Server Selection

This article provides a complete Jenkinsfile example that defines choice parameters for selecting an environment (Dev, QA, Stage, Prod) and a corresponding server list, using Groovy scripts for dynamic values.

The pipeline includes an example stage that echoes the selected parameters, validates them, and aborts the build if the server list could not be retrieved.

properties([
    parameters([
        [$class: 'ChoiceParameter',
            choiceType: 'PT_SINGLE_SELECT',
            description: 'Select the Env Name from the Dropdown List',
            filterLength: 1,
            filterable: true,
            name: 'Env',
            randomName: 'choice-parameter-5631314439613978',
            script: [
                $class: 'GroovyScript',
                fallbackScript: [
                    classpath: [],
                    sandbox: false,
                    script: 'return[\'Could not get Env\']'
                ],
                script: [
                    classpath: [],
                    sandbox: false,
                    script: 'return["Dev","QA","Stage","Prod"]'
                ]
            ]
        ],
        [$class: 'CascadeChoiceParameter',
            choiceType: 'PT_SINGLE_SELECT',
            description: 'Select the Server from the Dropdown List',
            filterLength: 1,
            filterable: true,
            name: 'Server',
            randomName: 'choice-parameter-5631314456178619',
            referencedParameters: 'Env',
            script: [
                $class: 'GroovyScript',
                fallbackScript: [
                    classpath: [],
                    sandbox: false,
                    script: 'return[\'Could not get Environment from Env Param\']'
                ],
                script: [
                    classpath: [],
                    sandbox: false,
                    script: '''
if (Env.equals("Dev")){
    return["devaaa001","devaaa002","devbbb001","devbbb002","devccc001","devccc002"]
}
else if(Env.equals("QA")){
    return["qaaaa001","qabbb002","qaccc003"]
}
else if(Env.equals("Stage")){
    return["staaa001","stbbb002","stccc003"]
}
else if(Env.equals("Prod")){
    return["praaa001","prbbb002","prccc003"]
}
'''
                ]
            ]
        ]
    ])
])

pipeline {
  environment {
         vari = ""
  }
  agent any
  stages {
      stage ("Example") {
        steps {
         script{
          echo 'Hello'
          echo "${params.Env}"
          echo "${params.Server}"
          if (params.Server.equals("Could not get Environment from Env Param")) {
              echo "Must be the first build after Pipeline deployment.  Aborting the build"
              currentBuild.result = 'ABORTED'
              return
          }
          echo "Crossed param validation"
        } }
      }
  }
}