Using Extracted JSON Value in Another JMeter Thread

Question

First, let me preface this question that I've only been using JMeter for 36 hours.

I've been able to successfully create a thread that performs a POST (json body) to generate a new record.

{  
   "id":1257697771,
   "displayName":"TERM2",
   "functionName":"f_1257697771",
   "displayableSourceExpression":"TRUE",
   "typeId":200,
   "groupId":300,
   "clobObjId":1257697772,
   "typeCode":5,
   ..........
}

I need to take the new record's ID (1257697771) value returned in order to perform updates, get by ID, delete, etc. on this record in other threads.

After much reading, I've created a Regular Expression Extractor where:

Apply to: Main Sample Only
Field to Check: Body as Document
Reference Name: newRecord
Regular Expression: "id":(.+?)\,"displayName"
Template: $1$
Match No: 1
Default Value: NONE

At this point, I'm not sure if my Regular Expression is formatted correctly where (.+?) is valid.

Also, I'm confused if I can either just specify the new reference (newRecord) in another thread's HTTP request's Parameters or use a BeanShell Post-Processor, or a Response Assertion, etc....

There a lot of answers for the same function of "Passing". Not being a programmer, I've tried to follow the discussion "how to extract json response data in jmeter using regular expression extractor?", but I'm still not clear.

Any insight is appreciated. Thanks.

Regexp is better to be: "id":(\d+?), newRecord you can use in every another sampers and beanshells using ${newRecord}. In beanshel is also you can get value using String s = vars.get("newRecord"); — v0devil

Dmitri T Dmitri T · Accepted Answer · 2016-02-04T16:35:03

JMeter Variables are local to Thread Group, you need to convert your variable to JMeter Property.

Use:

__setProperty() function in the Thread Group where you define your newRecord variable like:
```
 ${__setProperty(newRecord,${newRecord},)}
```
__P() function to access property value like:
```
${__P(newRecord,)}
```

See Knit One Pearl Two: How to Use Variables in Different Thread Groups article for more detailed explanation.

Also be aware of the Function Helper Dialog as it looks like JMeter functions syntax was developed by aliens.

Using Extracted JSON Value in Another JMeter Thread

3 Answers