I'm having trouble running a Jenkins job using Groovy, and it seems super simple but I'm 1) a noob at Java/Groovy and 2) all the examples I can find are not quite what I need to do.
I found the following similar question: Jenkins Groovy Parallel Variable not working, but that exact code results in an error:
java.lang.UnsupportedOperationException: Calling public static java.util.List org.codehaus.groovy.runtime.DefaultGroovyMethods.collect(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
Here's my pseudo-code of what I want to do:
String[] arr = [ "one","two","three",'four','five' ]
echo "Running commands: ${arr}"
int top = arr.size()
echo "top is ${top}"
parallel arr.each {
echo "${it}"
}
I've tried closures, but they throw an error and honestly I barely know how to use them. The following code
String[] arr = [ "one","two","three",'four','five' ]
echo "Running commands: ${arr}"
parallel arr.collect { item ->
{ ->
echo "${item}"
}
}
throws the same "java.lang.UnsupportedOperationException" as the related question above.
I'm trying to learn how to properly utilize Groovy with Jenkins, but it's been rough. Just looking for any help I can get at this point.
Thank you.
This plugin adds a tool that lets you easily execute tests in parallel. This is achieved by having Jenkins look at the test execution time of the last run, split tests into multiple units of roughly equal size, then execute them in parallel.
Jenkins is a great CI tool when it comes to flexibility. Every simple thing can be done in ten different ways, including parallelizing a build.
It's a pretty annoying limitation, but currently you can't use .each
in a pipeline script (as documented here: https://issues.jenkins-ci.org/browse/JENKINS-26481)
You need to do an actual loop, like
String[] arr = [ "one","two","three",'four','five' ]
echo "Running commands: ${arr}"
int top = arr.size()
echo "top is ${top}"
for (it in arr) {
echo "${it}"
}
If actually need parallel execution the code will look more like:
String[] arr = [ "one","two","three",'four','five' ]
echo "Running commands: ${arr}"
int top = arr.size()
echo "top is ${top}"
def stepsForParallel = [:]
for (int i = 0; i < arr.size(); i++) {
def it = arr[i]
def stepName = "running ${it}"
stepsForParallel[stepName] = { ->
echo "${it}"
}
}
parallel stepsForParallel
The other stackoverflow you linked to uses the Build Flow plugin, which is the predecessor to the Pipeline plugin that you're using. That's why the same code doesn't work.
EDIT: In modern Jenkins (tested in 2.150.1) the original bug listed above is fixed, and .each
works. You can do the following for parallel execution:
String[] arr = [ "one","two","three",'four','five' ]
def stepsForParallel = [:]
arr.each {
def stepName = "running ${it}"
stepsForParallel[stepName] = { ->
echo "${it}"
}
}
parallel stepsForParallel
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