How to get Jenkins list of jobs in folder?

Unfortunately this code prepared by ritusmart at least on our version of Jenkins doesn't work, we are currently using 2.289.2.

And you can get jobs from specified folder in a simpler way

def folderName = "YOUR/FOLDER/NAME/"
def allJobs = hudson.model.Hudson.getInstance().getAllItems(Job.class).findAll { it.getFullName().contains(folderName) }

This is one way to do it, using script console:

import com.cloudbees.hudson.plugins.folder.Folder

def folderName = "test"

def allJobs= hudson.model.Hudson.getInstance().getItems()

for(int i=0; i<allJobs.size(); i++){
    def job = allJobs[i]
    if(job instanceof hudson.model.Project && job .getLastBuild() != null ){
        processJob(job)
    }else if(job instanceof Folder){
        processFolderByName(job)
    }
}

void processFolderByName(Item folder){
  if(folder.getFullName().contains(folderName))
  processFolder(folder)
}

void processFolder(Item folder){
    //println "Processing Folder -"+folder.getFullName()
    folder.getItems().each{
        if(it instanceof com.cloudbees.hudson.plugins.folder.AbstractFolder){
            processFolder(it)
        }else{
            processJob(it)
        }
    }
}

void processJob(Item job){
    println  job.getFullName()
  // you can do operations like enable to disable
  // job.disable()
}

Not work for me. I created new implementation

def folderName = "folder_name_full_path"
def jobsList = []
Jenkins.instance.getAllItems(Job.class).each{
  if(it.fullName.contains(folderName)) {
    jobsList << it.fullName
  }
}