Jenkins CascadeChoiceParameter causes MissingPropertyException: No such property - jenkins

Question

I have (in this simplified example) two dynamic parameters in my Jenkinsfile, the first one is a ChoiceParameter, the second one is a CascadeChoiceParameter, depending on the first one.
The code below shows these two parameters CATEGORY and USER in my Jenkinsfile:
properties([
parameters([
[
$class: 'ChoiceParameter',
choiceType: 'PT_SINGLE_SELECT',
name: 'CATEGORY',
script: [
$class: 'GroovyScript',
script: [ classpath: [], sandbox: true, script:
"""
return ['one', 'two']
"""
]
]
],
[
$class: 'CascadeChoiceParameter',
choiceType: 'PT_SINGLE_SELECT',
referencedParameters: 'CATEGORY',
name: 'USER',
script: [
$class: 'GroovyScript',
script: [ classpath: [], sandbox: true, script:
"""
if ( CATEGORY.equals( 'one' ) ) {
return ['user for category one']
} else {
return ['user for category two']
}
"""
]
]
],
])
])
They do work (that is, the second one USER changes depending on the first one CATEGORY), but also producing the following exception in the Jenkins log:
Error executing script for dynamic parameter
groovy.lang.MissingPropertyException: No such property: CATEGORY for class: groovy.lang.Binding
at groovy.lang.Binding.getVariable(Binding.java:63)
[...]
Caused: java.lang.RuntimeException: Failed to evaluate script: No such property: CATEGORY for class: groovy.lang.Binding
at org.biouno.unochoice.model.GroovyScript.eval(GroovyScript.java:197)
at org.biouno.unochoice.util.ScriptCallback.call(ScriptCallback.java:96)
[...]
I tried to modify the IF-statement of the second groovy script from
if ( CATEGORY.equals( 'one' ) ) {
to
if ( "${CATEGORY}".equals( 'one' ) ) {
This eliminates the exception, but (using a Logger) shows that "${CATEGORY}" always evaluates to "one", never to "two", even after changing the dropdown value for the ChoiceParameter "CATEGORY" in the Jenkins UI.
How must I access the parameter CATEGORY in the Groovy script to get it working without throwing an exception?

Answer 1

The following seems to work fine for me. Try updating the Plugin maybe.
def CATEGORY = ""
properties([
parameters([
[
$class: 'ChoiceParameter',
choiceType: 'PT_SINGLE_SELECT',
name: 'CATEGORY',
script: [
$class: 'GroovyScript',
script: [ classpath: [], sandbox: true, script:
"""
return ['one', 'two']
"""
]
]
],
[
$class: 'CascadeChoiceParameter',
choiceType: 'PT_SINGLE_SELECT',
referencedParameters: 'CATEGORY',
name: 'USER',
script: [
$class: 'GroovyScript',
script: [ classpath: [], sandbox: true, script:
"""
if ( CATEGORY.equals( 'one' ) ) {
return ['user for category one']
} else {
return ['user for category two']
}
"""
]
]
],
])
])
pipeline {
agent any
stages {
stage('Hello') {
steps {
echo 'Hello World'
println "Category: " + CATEGORY
println "User: " + USER
}
}
}
}