Getting a second parameter based on the first parameter in Jenkins - jenkins

Question

I have a task where my Jenkins job needs two parameters for build. The first specifies the application name and can be either QA, Dev, Prod etc and the second is a server which is dependent on the first one.
Example: If I chose the app name as QA, the second parameter should display values like QAServer1, QAServer2, QAServer3.
I'm using Active Choices Plugin (https://wiki.jenkins.io/display/JENKINS/Active+Choices+Plugin) to get this done but facing an problem in fetching the second parameter contents.
Snapshots:
For obtaining the second parameter, I've written a Groovy code which reads the respective files of the selected first parameter and gets the details.
code:
#!/usr/bin/env groovy
import hudson.model.*
def Appliname = System.getenv("APPNAME")
//println Appliname
def list1 = []
def directoryName = "C:/Users/Dev/Desktop/JSONSTest"
def fileSubStr = Appliname
def filePattern = ~/${fileSubStr}/
def directory = new File(directoryName)
def findFilenameClosure =
{
if (filePattern.matcher(it.name).find())
{
def jsoname = it.name
def jsoname1 = jsoname.reverse().take(9).reverse()
list1.add(jsoname1.substring(1,4))
String listAsString = "[\'${list1.join("', '")}\']"
println "return"+listAsString
}
}
directory.eachFileRecurse(findFilenameClosure)
The above code will print the output as return['QAServer1', 'QAServer2'] which i want to use it as input for the second parameter.
Snapshot of Second parameter:
Somehow the Groovy script is not being executed and second parameter value remains empty. How can i get this done dynamically. Am i following the right away to it. Kindly help me figure out. TIA

Answer 1

Would you like to try below change
From:
def findFilenameClosure =
{
if (filePattern.matcher(it.name).find())
{
def jsoname = it.name
def jsoname1 = jsoname.reverse().take(9).reverse()
list1.add(jsoname1.substring(1,4))
String listAsString = "[\'${list1.join("', '")}\']"
println "return"+listAsString
}
}
directory.eachFileRecurse(findFilenameClosure)
To:
directory.eachFileRecurse {
if (filePattern.matcher(it.name).find()) {
def jsoname = it.name
def jsoname1 = jsoname.reverse().take(9).reverse()
list1.add(jsoname1.substring(1,4))
}
}
return list1