Custom Groovy function with arguments doesn't work in Jenkins pipeline - jenkins

Question

I'm using a function to set environment variables in Jenkins pipeline. I've noticed that if I declare function without argument, it works, but if I declare function that accepts 1 string argument, Jenkins throws error No such DSL method 'get_metadata' found among steps while running my pipeline.
def get_metadata(String type) {
switch(type) {
case "env":
return "environment name";
break;
case "domain":
return "domain name";
break;
case "cloud":
return "cloud name";
break;
default:
return "none";
break;
}
}
pipeline {
environment {
PROJECT=get_metadata()
CLOUD=get_metadata(type: "cloud")
DOMAIN=get_metadata(type: "domain")
ENVIRONMENT=get_metadata(type: "env")
}
}
Function without argument works when I call it like get_metadata()
def get_metadata() {
<...>
}
Jenkins version is 2.289.2.

Answer 1

Your get_metadata does not define a default value for type and therefore the call to PROJECT=get_metadata() throws an error, as you can't use it as is without passing the type parameter.
To solve it you can just add a default value to your function:
def get_metadata(String type = '') {
switch(type) {
case "env":
return "environment name";
case "domain":
return "domain name";
case "cloud":
return "cloud name";
default:
return "none";
}
}