Parse JSON data, and write the data to a file using groovy

Question

Here we are replacing a value of "dpidsha1" from 1234 to another value "abcd" in json conent, and We are trying to write json formatted content to a file "uselessfile.json", and print the content of the file "uselessfile.json"

import groovy.json.JsonBuilder
import groovy.json.JsonSlurper

def buildContent(){


def content = """
{
   "app":{ },
   "at":2,
   "badv":[ ],
   "bcat":[ ],
   "device":[ {
      "carrier":"310-410",
      "connectiontype":3,
      "devicetype":1,
      "dnt":0,
      "dpidmd5":"268d403db34e32c45869bb1401247af9",
      "dpidsha1":"1234" 
   },
   {
      "carrier":"310-410",
      "connectiontype":3,
      "devicetype":1,
      "dnt":0,
      "dpidmd5":"268d403db34e32c45869bb1401247af9",
      "dpidsha1":"1234" 
   }]
}"""

def slurped = new JsonSlurper().parseText(content)
def builder = new JsonBuilder(slurped)
builder.content.device.dpidsha1 = 'abcd'  
println(builder.toPrettyString())

writeFile file: 'uselessfile.json', text: builder.toPrettyString(content)

  File file = new File("uselessfile.json")

  println "Below is the content of the file ${file.absolutePath}"
  println uselessfile.json

ERROR:

[Pipeline] End of Pipeline an exception which occurred: in field com.cloudbees.groovy.cps.impl.BlockScopeEnv.locals

Caused: java.io.NotSerializableException: groovy.json.JsonBuilder

jsonBuilder.toPrettyString(content) should be builder.toPrettyString(content) — yong
– yong, Commented Mar 18, 2019 at 1:32
It still fails while writing the data to uselessfile.json file. I have updated the question. — itgeek
– itgeek, Commented Mar 18, 2019 at 3:03

yong · Accepted Answer · 2019-03-18 05:21:40Z

You can use pipeline utility steps readJSON and writeJSON to archive your goal as following:

def buildContent(){

   def content = """
      {
         "app":{ },
         "at":2,
         "badv":[ ],
         "bcat":[ ],
         "device":{
            "carrier":"310-410",
            "connectiontype":3,
            "devicetype":1,
            "dnt":0,
            "dpidmd5":"268d403db34e32c45869bb1401247af9",
            "dpidsha1":"1234" 
         }
      }
   """

   def jsonObj = readJSON text: content.trim()
   jsonObj.device.dpidsha1 = 'abcd'

   writeJSON file: 'uselessfile.json', json: jsonObj, pretty: 4

   sh 'cat uselessfile.json'
}

The reason of java.io.NotSerializableException: groovy.json.JsonBuilder is Jenkins pipeline will store the pipeline after serialize. But the class groovy.json.JsonBuilder not implement Serializable, thus it's can't be serialized

Still getting ERROR: No such field found: field net.sf.json.JSONArray version. I have updated the question .

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