Jenkins Pipeline NotSerializableException: groovy.json.internal.LazyMap

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Use JsonSlurperClassic instead.

Since Groovy 2.3 (note: Jenkins 2.7.1 uses Groovy 2.4.7) JsonSlurper returns LazyMap instead of HashMap. This makes new implementation of JsonSlurper not thread safe and not serializable. This makes it unusable outside of @NonDSL functions in pipeline DSL scripts.

However you can fall-back to groovy.json.JsonSlurperClassic which supports old behavior and could be safely used within pipeline scripts.

Example

import groovy.json.JsonSlurperClassic 


@NonCPS
def jsonParse(def json) {
    new groovy.json.JsonSlurperClassic().parseText(json)
}

node('master') {
    def config =  jsonParse(readFile("config.json"))

    def db = config["database"]["address"]
    ...
}

ps. You still will need to approve JsonSlurperClassic before it could be called.

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