CODEWITHSUNDEEP
jenkins
seedie
seedie

Reputation: 48

Jenkins method not found when passing no parameter to function

I have a Jenkins shared Library that loads custom methods:

sharedLibrary.groovy

def hello(String world) {
    if (world)  {
        echo "${world}"
    }
    else {
        echo "no parameter"
    }    
}

The method is used in a Jenkins declarative pipeline

stages { 
   stage('Test and Package JAR') {
      steps {
         script {
            sharedLibrary.hello("")
         }
      }
   }
}

As long as I call the method with sharedLibrary.hello("")or sharedLibrary.hello("Hello World!")everything works as expected.

But If I call it with sharedLibrary.hello()(using no quotes) I receive the following error even though to my knowledge this is valid groovy code.

java.lang.NoSuchMethodError: No such DSL method 'hello' found among steps

What is the reason behind this? It seems counterintuitive to pass "" if I don't want to pass any input at all.

Upvotes: 0

Views: 922

Answers (1)

smelm
smelm

Reputation: 1334

The behavior you're looking for can be achieved with default values:

def sayIt(it = "hi"){
  println(it)
}

sayIt()
sayIt("Hello")

Also I would only recommend it in cases with very clear and sensible default values. In the case of "" I would advise against it, since most of the time an empty string is not the result you are looking for.

Upvotes: 1

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