How to put and execute code into Keyword with JSR223? - jmeter

Question

I try to implement this : https://www.testautomationguru.com/jmeter-how-to-create-a-data-keyword-driven-framework-for-performance-testing/
I have a .csv file with the test case name in the first column. So I want to run a specfic test case according to the value in the .csv.
Test Plan
|--- Test Fragment
|--- Switch Controller
|--- Transaction Controller (TestCase1)
|--- JSR223 Sample (TestCase1 script)
|--- Transaction Controller (TestCase2)
|--- JSR223 Sample (TestCase2 script)
|--- Transaction Controller (TestCase3)
|--- JSR223 Sample (TestCase3 script)
|--- Thread Group
|--- CSV Data Set Config
|--- Debug Sampler
|--- ForEach Controller
|--- Module Controller
|--- View Result Tree
However if I put some code in JSR223 into Transaction Controller, like log.info("TEST !") nothing is display into the console.
Is there a solution to execute code write into JSR223 and display it into the console?
Moreover, in the View Result Tree I found this information: testcasename=TestCase1. So it seems to work but no log...
Thanks a lot.

Answer 1

Simpy use OUT instead of log:
OUT.println("Hello Console");
OUT - System.out - e.g. OUT.println("message")

Answer 2

Given you use log shorthand you will be able to see your TEST ! message only in jmeter.log file
If you want to see the message in STDOUT you should use println instead like:
println("TEST !")
If you want to continue using log shorthand and to see the messages both in jmeter.log file and STDOUT - you will need to amend JMeter logging configuration like:
in log4j2.xml file (lives in "bin" folder of your JMeter installation)
Under <Appenders> tag add the following block:
<Console name="STDOUT" target="SYSTEM_OUT">
<PatternLayout>
<pattern>%d %p %c{1.}: %m%n</pattern>
</PatternLayout>
</Console>
Under <Root> tag add the following line:
<AppenderRef ref="STDOUT"/>
Once you restart JMeter you should start seeing the same information as in the jmeter.log file in the STDOUT including your custom messages