[FIXED] How to run XmlParser / Read XML in Jenkins declarative pipeline

Issue

I have the following in a Jenkins file where I am trying to get some text from an XML file:

    pipeline {
      agent any
      stages {
        stage('Start') {
          steps {
            echo 'Build start'  
            script {
              def xml = readFile "${env.WORKSPACE}/config.xml"
              def xmlContents = new XmlParser().parseText(xml)
              def text = xmlContents.text()
              echo 'contents are...'
              echo text
              
            }
          }
        }
    .....

This causes the following exception

    org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: Scripts not permitted to use method groovy.util.XmlParser parseText java.lang.String
        at org.jenkinsci.plugins.scriptsecurity.sandbox.whitelists.StaticWhitelist.rejectMethod(StaticWhitelist.java:262)
        at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:161)
        at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:156)
        at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:160)
        at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:17)
        at WorkflowScript.run(WorkflowScript:9)

According to a solution to this problem as posted here, I need to go in and set the In-process Script Approval, however I have done this a couple of times..

Also, elsewhere, I have seen comments to disable sandbox mode, but I do not have this option as shown in other screen shots...

Perhaps things have changed.

So, my question is, how can I read the contents of an XML file if can't use the XMLParser? Or how can I use the XMLParser?

Solution

I have since found that you just need to keep approving each individual method (including constructors), one at a time. Ie, you may approve one, and then you get the next error.

I did not notice that they were subtley different approvals required.

Answered By - peterc
Answer Checked By - Katrina (JavaFixing Volunteer)