###1.新建task

并在脚本中添加如下代码

pipeline {
    agent any

   stages {
        stage('Hello') {
            steps {
                cleanWs()

                script{
                    def xml = '<root><one a1="uno!"></one><two>Some text No1!</two><two>Some text No2!</two><two>Some text No3!</two></root>'
                    def rootNode = new XmlParser().parseText(xml)
                    println rootNode
                    println rootNode['two'][1].text()
                }
            }
        }
    }
}

###2.build task 第一次build应该会报错，进入本次build的Console Output 预计会看到有如下报错

org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: No such field found: field groovy.util.Node a1
	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.unclassifiedField(SandboxInterceptor.java:425)
	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onGetProperty(SandboxInterceptor.java:409)
	at org.kohsuke.groovy.sandbox.impl.Checker$6.call(Checker.java:291)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:295)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:258)
	at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.getProperty(SandboxInvoker.java:29)
	at com.cloudbees.groovy.cps.impl.PropertyAccessBlock.rawGet(PropertyAccessBlock.java:20)
	at WorkflowScript.run(WorkflowScript:13)

重点是第一行的 **org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException ** 如果报这个错，按照如下步骤进行处理

###3.解决RejectedAccessException ####3.1 Approve Signatures Manage Jenkins -> In-process Script Approval -> Approve
点击完”Approve”按钮后，它应该就会消失，然后在“ Signatures already approved:”栏目中新增了一条记录

####3.2多次Approve 上面3.1执行完毕后，回到task，并进行build，应该还会再次失败，根据Console Output发现还是RejectedAccessException，这时候别慌，仔细看具体log

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:158)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:162)
	at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:17)
	at WorkflowScript.run(WorkflowScript:11)
	at ___cps.transform___(Native Method)

仔细对比这两次的第一行
初次build： org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: No such field found: field groovy.util.Node a1

第二次build org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: Scripts not permitted to use method groovy.util.XmlParser parseText java.lang.String

虽然他们都是因为权限拒绝而执行失败，但是被拒绝的具体权限不一样。这时候，重复步骤3.1，进入In-process Script Approval，发现”Approve”按钮又出现了，果断点击，新增授权记录。然后重复当前(3.2)的操作知道没有RejectedAccessException出现为止