Jmeter env custom function doesn't read environment variable

Question

I was following blazemeter tutorial on how to run Jmeter script from the command line (cmd.exe in Windows10 OS). I'm trying to pass environment variable to the Jmeter ${__env} (according to this page) custom function, using Jmeter script from the command line. Below is the screenshot of the env function in Jmeter UI

I've also tried without quotes ${__env(password)} and also using JSR223 PreProcessor

vars.put("password",${__env(password)}); 

but that didn't work either.

Below is my command line

set password=MyPassword123
jmeter -n -t C:\Work\Jmeter\MyScript.jmx

But Jmeter fails to execute my test plan

Creating summariser <summary>
Created the tree successfully using C:\Work\Jmeter\MyScript.jmx
Starting the test @ Fri Sep 28 16:45:38 EDT 2018 (1538167538606)
Waiting for possible Shutdown/StopTestNow/Heapdump message on port 4445
summary =      2 in 00:00:01 =    3.1/s Avg:   250 Min:     1 Max:   499 Err:     1 (50.00%)
Tidying up ...    @ Fri Sep 28 16:45:39 EDT 2018 (1538167539431)
... end of run

Is it possible to read environment variable using Jmeter? How to properly set it up. Has anyone able to achieve this before? Thanks a lot people!

Answer 1

1. When you use User Defined Variables remove the quotation marks around "password", to wit:

   ${__env(password,,) 
   

2. When you use JSR223 Elements don't inline the function into the script body, either go for "Parameters" section or use code-based equivalent instead like:

   vars.put("password", System.getenv("password"))
   

   This is a form of "soft requirement" because JMeter Functions and Variables syntax conflicts with GString Templates. Moreover it makes Groovy script compilation caching impossible negatively impacting the performance. Check out Apache Groovy - Why and How You Should Use It article for more information regarding using Groovy scripting in JMeter tests

Demo:

Answer 2

Make sure you installed the Custom Functions Plugin in JMeter Plugins Manager. env function is part of this plugin.