[BUG] java.lang.Integer cannot be cast to class java.lang.String

[augustocarvalho]

In Jenkins we have jobs with REST List Parameter enabled and it uses our Docker Tags as REST endpoint:
Ex:
REST Endpoint: https://REPO_URL/v2/hello-world/tags/list
MIME type: APPLICATION JSON
Value Expression: $.tags

When manually curl the address we have as result:
{
"name" : "hello-world",
"tags" : [ "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "3", "4", "6", "7", "8", "9" ]
}

Versions (please complete the following information):

• Jenkins: 2.319.2
• Plugin: 1.5.0
• Browser: Firefox or Chrome

Additional context
JENKINS ERROR:

Error while serving http://JOB_URL/descriptorByName/io.jenkins.plugins.restlistparam.RestListParameterDefinition/testConfiguration
java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.String (java.lang.Integer and java.lang.String are in module java.base of loader 'bootstrap')

Caused: java.lang.reflect.InvocationTargetException
at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:397)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:405)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:208)

There is other Job that it works and the JSON result is:
{
"name" : "image_name",
"tags" : [ "1.0.0-20210211101025", "1.0.0-20210211101625", "1.0.0-20210211101756", "1.0.0-20210211102118", "1.0.0-20210305142411", "1.0.0-20210309074905", "1.0.0-20210310065345", "1.0.0-20210312074331", "1.0.0-20210319065144", "1.0.0-20210324142526", "1.0.0-20210330073431", "1.0.0-20210426065757", "1.0.0-20210519113253", "1.0.0-49", "1.0.0-52", "1.0.0-53", "1.0.0-54", "1.0.0-latest" ]
}

[h1dden-da3m0n]

Hello there,

Thank you for the bug report! I will see that I can reproduce this and provide a fix soon.
I just hope its not a Json Parser issue, cause there I am dependent on the library I use.

[augustocarvalho]

Hi, any news on this ?! Thanks/

[h1dden-da3m0n]

Hi,
unfortunately not yet. I intended to get working on this but got quite busy at work and eventually it fell through. I will try to get on debugging latest this weekend and keep you posted!
Thank you for bringing it back to my attention!

[h1dden-da3m0n]

Hi again,

Had some time today and managed to reproduce this.
Thanks to your awesome fault description with value examples it was easy to have a reproducible test environment, so a big thank you for that!

Now, I managed to find the fault in my code and have a local fix ready that I will publish soon. Arguably, it is a very trivial fix that I am annoyed I did not see earlier 🤦‍♂️ so thank you for reporting it back!

[h1dden-da3m0n]

I will release 1.5.1 with the fix for this the moment the JenkinsCI Jenkins instance manages to successfully build again, seems like there is something funky going on rn ☹️

[h1dden-da3m0n]

well I risked and simply cut the release. rest-list-parameter-1.5.1

Thank you for your patients and reporting this 👍

[augustocarvalho]

It works, I appreciate your time looking at it.