Groovy: Seems like a scope issue but cannot find where, can you? - groovy

Question

I wrote some functions to help me writing Jenkins pipelines.
The following functions, are responsible to returning a shell command output:
def gen_uuid(){
randomUUID() as String
}
def sh_out(cmd){
String uuid = gen_uuid()
sh """( ${cmd} )> ${uuid}"""
String out = readFile(uuid).trim()
sh "set +x ; rm ${uuid}"
return out
}
That shown, here's another function:
Map get_started_by(){
withCredentials([ // Use Jenkins credentials ID of artifactory
[$class: 'UsernamePasswordMultiBinding', credentialsId: '0b8d591a-f4ce-XXXX-XXXX-faecb504d3d0', usernameVariable: 'J_USER', passwordVariable: 'J_PASS'],
]){
List startedBy = sh_out("""
set +x; curl -u ${J_USER}:${J_PASS} '${env.BUILD_URL}api/json' 2>/dev/null | \
python -mjson.tool | \
awk -F'"' '/(userId|userName)/{print \$4}'
""").split(/(\n)/)
return [
userId: startedBy[0],
userName: startedBy[1]
]
}
}
Which returns the userId and userName of the user who issue the job run.
Then, my problem is in this function:
def run_in_stage_func(String stage_name, Closure command, String sendTo){
String started_by = get_started_by()
String ulink = "<#${started_by['userId']}>"
String jlink = "(<${env.BUILD_URL}|Open>)"
println "============================================================"
stage (stage_name) {
try {
command()
if (currentBuild.result == 'FAILURE') {
error "Build failed, see log for further details."
}
println "============================================================"
} catch (Exception ex) {
def except = "${ex}"
slackSend channel: channel, color: 'danger', teamDomain: null, token: null,
message: " :${ulink} *Failed to build ${env.JOB_NAME}*! :x: ${jlink} (<!here|here>)"
echo "Pipeline failed at stage: ${stage_name}"
throw ex
}
}
}
When I run the job, I get the following error:
groovy.lang.MissingPropertyException: No such property: userId for class: java.lang.String
What could be the reason that the line ' String ulink = "<#${started_by['userId']}>" ' - is not working as intended?

Answer 1

You cast the result of get_started_by() to String explicitly. To fix it, change your code to
def started_by = get_started_by()
or
Map started_by = get_started_by()