Reference a variable within a variable in JMeter

Question

I'm working with JMeter. I'd like to specify the test host using user defined variables, like this:

variable name       value  
localhost           localhost  
test                192.168.0.1
hostname            ${localhost}

Executing the test, I see that the hostname value is not substituted, and obviously the test fails. I know I can use properties and pass the hostname from the command line, or simply change the hostname value. Is it possible to it like I've explained?
Thanks.

Carlo · Accepted Answer · 2012-04-19 09:02:53Z

12

I've managed to solve my problem. I've changed the hostname variable value to: ${__evalVar(${localhost})}, but I've got this error:

ERRROR jmeter.functions.EvalVarFunction: Variables have not yet been defined

So I've moved the hostname variable declaration in a "User defined variable" child node of my Sampler node. That solved it.

answered Apr 19, 2012 at 9:02

Carlo

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2 Comments

Aliaksandr Belik Over a year ago

Fine that you solved this by yourself. One note: all the UDV elements in a test plan - no matter where they are - are processed at the start, so I could also simply use 2 consequent separate UDV and define in 1st 'localhost' var and in the 2nd - 'hostname' in the way you did.

Carlo Over a year ago

Thanks, I didn't think about this approach. I like it.

Thelesserknowngiant · Accepted Answer · 2016-08-24 18:24:31Z

10

To solve this you should use hostname = ${__eval(${localhost})}
http://jmeter.apache.org/usermanual/functions.html#__eval
Carlos' answer has a mistake (which I can't comment on due to rep) as it uses evalVar, this requires as an argument a plain string:

This works: ${__evalVar(localhost)})
This works: ${__eval(${localhost})}
This doesn't work (the current answer): ${__evalVar(${localhost})} http://jmeter.apache.org/usermanual/functions.html#__evalVar

answered Aug 24, 2016 at 18:24

Thelesserknowngiant

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1 Comment

raph Over a year ago

Tiny thing, but it looks like you have an extra right parenthesis at the end of This works: ${__evalVar(localhost)}).

Shai Alon · Accepted Answer · 2019-09-27 06:44:45Z

2

Check this forum: from Blazemeter

For example: getting value of varible "listid_XXX" where the XXX number comes from an index variable:

${__V(listid_${idx1})}

answered Sep 27, 2019 at 6:44

Shai Alon

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Comments

manikanta · Accepted Answer · 2014-04-16 09:04:17Z

1

New newer versions (from 2.2), you can use ${__V(${...})}/.

Ex: ${__V(${SERVER_CONTEXT})}/rest

As @Alies Belik mentioned, if you get

ERRROR jmeter.functions.EvalVarFunction: Variables have not yet been defined

then define the 2nd variable in next other UDV (User Defined Variables) node.

answered Apr 16, 2014 at 9:04

manikanta

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