The following script produces different output:

import groovy.transform.TupleConstructor

@TupleConstructor
class SimpleName {
String name

String toString()

{ name }

}

c = [new SimpleName("aaa"), new SimpleName("bbb")]
println c.class.name
println c.size()
println c.join("-")

 

In groovyConsole the output is:

 java.util.ArrayList
2
aaa-bbb

 

 In jenkins pipeline the output is:

Started by user Roman Ivanov
Running in Durability level: MAX_SURVIVABILITY
[Pipeline] echo
java.util.ArrayList
[Pipeline] echo
2
[Pipeline] echo
aaa
[Pipeline] End of Pipeline
Finished: SUCCESS