How to parse data, and write to a JSON file

Question

Here, we are replacing a value of "dpidsha1" from 1234 to another value "abcd" in JSON conent, and Facing an error while writing 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.find{it.dpidsha1}.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

How can I solve this?

Answer 1

I would prefer to use the Utility functions of the Jenkins Pipelines instead of the groovy classes. The below pipeline works. I have simplified the dumping to screen in the end to verify the result to use the bash cat command. But the result is what you want I think.

node('linux') {
  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 = readJSON text: content
  println (slurped)
  def builder = slurped
  builder.device.find{it.dpidsha1 == "1234"}.dpidsha1= "abcd"
  println(builder)

  writeJSON file: 'uselessfile.json', json: builder, pretty: 4
  sh 'cat uselessfile.json'
}