How to print each element of Multi-line String Parameter?

Question

I've Pipeline job in Jenkins (v2.7.1) where I'd like to print each element of Multi-line String parameter (Params) with 3 strings in each line: Foo, Bar, Baz as an input.

So I've tried the following syntax (using split and each):

Params.split("\\r?\\n").each { param -> println "Param: ${param}" }

but it fails with:

java.lang.UnsupportedOperationException: Calling public static java.lang.Object org.codehaus.groovy.runtime.DefaultGroovyMethods.each(java.lang.Object,groovy.lang.Closure) on a CPS-transformed closure is not yet supported (JENKINS-26481); encapsulate in a @NonCPS method, or use Java-style loops at org.jenkinsci.plugins.workflow.cps.GroovyClassLoaderWhitelist.checkJenkins26481(GroovyClassLoaderWhitelist.java:90)

which suggest to encapsulate in a @NonCPS method, or use Java-style loops.

So I've tried to encapsulate in a @NonCPS method like:

@NonCPS def printParams() { Params.split("\\r?\\n").each { param -> println "Param: ${param}" } } printParams()

but it fails with:

org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: Scripts not permitted to use staticMethod org.codehaus.groovy.runtime.DefaultGroovyMethods println groovy.lang.Closure java.lang.Object

Without the function (as per first example), adding @NonCPS at the beginning it complains about unexpected token.

I also tried Java-style syntax as suggested by using for operator (similar as here):

String[] params = Params.split("\\r?\\n") for (String param: params) { println "Param: ${param}" }

which seems to work in plain Groovy, but it fails in Jenkins with:

java.io.NotSerializableException: java.util.AbstractList$Itr at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:860)

Which syntax I should use to make it work?

I'm not sure how to use it, I've added @NonCPS at the beginning, but it complains about unexpected token. — kenorb
– kenorb, Commented Oct 22, 2016 at 19:02
in a way like in this question stackoverflow.com/questions/36636017/… . The question itself, not the answer. @NonCPS is smth. like python decorator — agg3l
– agg3l, Commented Oct 22, 2016 at 19:05
I've updated question showing code with @NonCPS which also fails. — kenorb
– kenorb, Commented Oct 22, 2016 at 19:11
Now you are hitting sandbox security with it. Proceed to Jenkins management to permit this method access or disable sandbox security for your job — agg3l
– agg3l, Commented Oct 22, 2016 at 19:12

Community · Accepted Answer · 2017-05-23 10:30:49Z

The code works fine when disabling a Use Groovy Sandbox option and adding @NonCPS helper method. Alternatively, as suggested by @agg3l, proceed to Jenkins management to permit this method access.

So the working code is (same as the 2nd example):

@NonCPS def printParams() { Params.split("\\r?\\n").each { param -> println "Param: ${param}" } } printParams()

Alternatively, add your printParams method to a Global Shared Library (see jenkins.io/doc/book/pipeline/shared-libraries/…) and you don't need to add anything to the scriptApproval

Jheison Rodriguez · Accepted Answer · 2020-07-15 05:27:06Z

I know it's an old post but this is my way to do it, hopefully help anyone else

params.readLines().each { println it if (it) { // if you want to avoid make operation with empty lines } }

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