Matias Fornara is Performance Tester and Software Developer at Abstracta. He specializes in JMeter Scripting and Java development applied to performance tests.

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Jun 28 2017

Easily Write a GOTO Statement in JMeter

What happens if you need to modify your Apache JMeter™ script’s flow according to an event? For example, going back to the homepage because a particular request failed, or skipping to a future step if a condition was fulfilled. This is where the GOTO statement comes in.


What is a GOTO Statement?


The aim of a GOTO statement is to perform a reassignment to another line of code. In other words, the GOTO statement is very useful when you need to jump to another part of the flow, which is usually identified by a particular label.


what is a goto statement


Creating a GOTO Statement in JMeter


The first step to creating a GOTO statement in JMeter is realizing there is no predefined GOTO structure in JMeter. So, what we can do is to nest a Module Controller within an If Controller. The If Controller lets you choose whether the child elements below it are run or not. The Module Controller enables substituting test plan fragments.


Let’s use a dummy scenario where we first log into a certain bank page, and then we go to the credit cards section where we perform some validations. If the login action goes wrong we would like to go back and try to login again - this is the moment our GOTO statement will take place.


In this scenario, the If Controller will check if the login was successful. If it failed, the Module Controller will redirect the user to the login page.


1. Add the If Controller from the Logic Controller list:


Right Click on the Thread Group →  Add →  Logic Controller → If Controller


creating a goto statement with the if controller


2. Make sure to establish a condition that will redirect the flow when fulfilled. The condition has to be a Javascript condition returning “true” or “false”, or a JMeter function that evaluates to “true”.


E.g.: "${JMeterThread.last_sample_ok}==true" where JMeterThread.last_sample_ok is a function that returns true or false depending whether the last sample was OK or not.


3. In order to establish the desired condition the “Condition (default javascript)“ field has to be filled inside the If Controller. We named the controller “GoTo”.


creating a goto statement on jmeter


In this case we will check whether the login sampler was successful or not, by using “${JMeterThread.last_sample_ok}==false”. If it fails, i.e. this condition was fulfilled, the Module Controller will go into action. If it does not fail and the condition isn’t false, the flow will advance towards the credit card section.


4. Now that the If Controller is properly configured with an appropriate condition, it’s time to nest the Module Controller within the If Controller as follows:


Right Click on the If Controller →  Add →  Logic Controller →  Module Controller


creating a goto statement with the module controller


5. Once the Module Controller is created, tell the controller which flow to take in case the previous condition has been fulfilled, i.e the login failed. So, inside the Module Controller pick an existing flow. In this example, I named the Module Controller “goTo_mainPage” and directed it to the main event page.


goto statement on jmeter, modifying the module controller


If the login does not fail, the GOTO statement will evaluate the If Controller condition, and as it wasn’t fulfilled, the flow will follow as in the below image.


goto statement success on jmeter


But, if the login fails we will observe the following result. In the View Results Tree, we will see the login failed and the If Controller and the Module Controller directed the user back to the main page, to login again.


goto statement fail in jmeter


And that’s it! You have set your own GOTO statement, very easily.


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