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  1. Jenkins
  2. JENKINS-69705

[readJSON] Invalid JSON String when file starts with spaces (ok with text param)

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      I used readJSON to parse a JSON string. But after migrated content to a file, my pipline stoped on:

      hudson.remoting.ProxyException: net.sf.json.JSONException: Invalid JSON String
	at net.sf.json.JSONSerializer.toJSON(JSONSerializer.java:143)
	at net.sf.json.JSONSerializer.toJSON(JSONSerializer.java:103)
	at net.sf.json.JSONSerializer.toJSON(JSONSerializer.java:84)
	at org.jenkinsci.plugins.pipeline.utility.steps.json.ReadJSONStepExecution.doRun(ReadJSONStepExecution.java:78)
	at org.jenkinsci.plugins.pipeline.utility.steps.AbstractFileOrTextStepExecution.run(AbstractFileOrTextStepExecution.java:29)
	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)

      After several die&retry, I found out issue come from the leading spaces at file start. MCVE:

      def text = ' {}'
                    
pipeline {
    agent any
    
    stages {
        stage('text') {
            steps {
                script {
                    def json = readJSON text: text // OK
                    println json
                }
            }
        }
        stage('file') {
            steps {
                script {
                    writeFile file:'inputs.json', text: text, encoding: 'UTF-8'
                    sh 'cat inputs.json'
                    def json = readJSON file: 'inputs.json' // ERROR
                    println json
                }
            }
        }
    }
}

            rsandell rsandell
            loganmzz Logan Mzz
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              Created:
              Updated: