How to concatenate string and integer values in jmeter

Question

I'm trying to concatenate string and integer values in JMeter as below

for(int i in 1..100){
    def cloudItemId="cloudItemId"+i;
    def deviceItemId="deviceItemId"+i;
}

but I'm getting this below error

Response message:Exception: groovy.lang.MissingMethodException: No signature of method:
java.lang.String.positive() is applicable for argument types: () values: []
Possible solutions: notify(), size(), tokenize()

How can Iconcatenate with cloudItemId/deviceItemId

Ori Marko · Accepted Answer · 2021-12-02 12:16:30Z

1

The issue is + sign is used for mathematic plus in integers and concatenation in Strings

You can concatenate using <<:

for(int i in 1..100){    
    def cloudItemId="cloudItemId" <<i;
    log.info(cloudItemId.toString());
    def deviceItemId="deviceItemId"<<i;
    log.info(cloudItemId.toString());
}

Or call String.valueOf to concat Strings:

for(int i in 1..100){
    def cloudItemId="cloudItemId" + String.valueOf(i);
    log.info(cloudItemId);
    def deviceItemId="deviceItemId"+ String.valueOf(i)
    log.info(cloudItemId);
}

edited Dec 2, 2021 at 12:16

answered Dec 2, 2021 at 12:10

Ori Marko

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Comments

Dmitri T · Accepted Answer · 2021-12-02 12:22:07Z

1

I cannot reproduce your issue using latest JMeter 5.4.1 (you're supposed to be using the latest JMeter version just in case):

so pay attention to your syntax and suspicious entries in jmeter.log file.

You can also slightly refactor your code to use GStrings and make it more Groovy:

1.upto(100, { i ->
    def cloudItemId = "cloudItemId$i"
    def deviceItemId = "deviceItemId$i"
    log.info('cloudItemId: ' + cloudItemId)
})

answered Dec 2, 2021 at 12:22

Dmitri T

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