groovy.lang.MissingPropertyException: No such property: Jenkins for class: hudson - jenkins

Question

I am trying to run a groovy script in Jenkins slave node to retrieve child jobs from a folder in Jenkins slave node. Here is the groovy script I tried:
I tried some SO answers and found groovy.lang.MissingPropertyException: No such property: jenkins for class: groovy.lang.Binding
But this doesn't solve my problem.
Please find the code that I tried:
import groovy.json.JsonSlurper
import groovy.json.JsonBuilder
import jenkins.model.*
static main(args){
def childJobFolder = "childJob"
def childJobNameList = []
def env = System.getenv()
// Setting the environment properties to variables.
def jenkinsUsername = env.UAT_JENKINS_MY_USER
def jenkinsPassword = env.UAT_JENKINS_MY_PASS
def jsonSlurper = new JsonSlurper()
// Getting the child job names from "childJob" folder
Jenkins.instance.getItemByFullName(childJobFolder).allJobs.each{
def childJobName = it.name.toString()
if(childJobName.startsWith("job-")){
childJobNameList.add(childJobName)
}
}
println "\n" + "Child Jobs Available: " + childJobNameList + "\n"
}
Here is what I got in the console:
Caught: groovy.lang.MissingPropertyException: No such property: Jenkins for class: hudson3067346520259876246
groovy.lang.MissingPropertyException: No such property: Jenkins for class: hudson3067346520259876246
at hudson3067346520259876246.run(hudson3067346520259876246.groovy:17)
Build step 'Execute Groovy script' marked build as failure
Can someone help me to fix this error? Thanks in advance!

Answer 1

Finally, I found out the solution for this error. This is caused by running on plain groovy script instead of system groovy script. As Jayan said the Jenkins variables only available for System groovy scripts and not for plain groovy script. For that reason I could not load Jenkins instances from plain groovy script.