I am adding jenkins parameters to a job from system groovy script (one build step):

1-st step.

import hudson.model.*
def pa = new ParametersAction([
    new StringParameterValue("firstParam", 1), new StringParameterValue("secondParam", 2)
])
Thread.currentThread().executable.addAction(pa)

Now when I try to execute the next system groovy build step, I am looking for them and they are not there:

2nd step.

def firstParam = "firstParam"
def secondParam = "secondParam"
def resolver = build.buildVariableResolver
def firstParamValue = resolver.resolve(firstParam)
def secondParamValue = resolver.resolve(secondParam)
println firstParamValue
println secondParamValue  

they both print null! How do I get the parameters in the next system groovy build step?

The weird thing is that when I try a shell execution as a following step and if I do:

echo $firstParam
echo $secondParam

I get both 1 and 2 printed.

Even when I try to print all parameters with the below code I don't get them:

def thr = Thread.currentThread()
def build = thr?.executable
def parameters = build?.actions.find{ it instanceof ParametersAction }?.parameters
parameters.each {  
  println "parameter ${it.name}:"
  println it.dump()
  println "-" * 80
}