Reading session variable has a different value when using EL, in multiple user run

Gatling (Open-Source)
1

Hi,

I’m unable to understand this behavior. I have tried to elucidate my code below. Value of session(“UserId”).as[String] and EL ${UserId} differ in same execution chain for same session.
What am i missing to tis this. Body and Header of HTTP Request should have same value but they differ in actual request.

Please note that when i do single user run, the test passes (return 200 K), but for multiple users I get the issue below (400 fail):

{

“error_msg”:”userId in header 123146529326857 does not match userId in body 123146529341992”

}

Thank you in advance for any guidance

Thanks
shree

//scenario class

val callChain=scenario(“TestScenario")

.exec(api.Login.LoginTransaction)

.exec(api.apiCreateEntity.apiCreateEntityTransaction)

//api.Login class

val apiLoginTransaction =

exec(

http(“Login”)

…

…

.check(jsonPath("$.ticket").saveAs(“TickeId"))

.check(jsonPath("$.userId").saveAs(“UserId”))

//api.apiCreateEntity class

var Payload=

“”"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<userCredentials xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xsi:type=“MyCredential">

%%AUTH_ID1%%

<owner xsi:type=“MyCredentialKey" xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”>

%%AUTH_ID2%%

“”"

val apiCreateEntityTransaction =

.exec(session => {

val userId=session(“UserId”).as[String] // WHY IS DIFFERENT FROM EL EXPRESSION USED IN HEADER FOR ${USERID} BELOW IN HTTP REQUEST SUBMITTED??

var ticketId=session(“TicketId”).as[String]

Payload=Payload.replace("%%AUTH_ID1%%”,userId)

Payload=Payload.replace("%%AUTH_ID2%%”,userId)

})

.exec(

http(“CreateEntity”)

.post(“some url”)

.header(“Authorization”, “Some_Authentication token,userId=${UserId}”)

.header(“Content-Type”, “application/xml”)

.body(StringBody("${Payload}")

Results

response:

status 400

{

“error_msg”:"userId in header 123146529326857 does not match userId in body 123146529341992”

}

HTTP Trace

“Authorization”, “Some_Authentication token,userId=123146529326857”

compositeByteData=<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<userCredentials xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xsi:type=“MyCredential">

123146529326992

<owner xsi:type=“MyCredentialKey" xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”>

123146529326992