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Gatling Fundamentals for Stress Testing APIs - Java

Name: Gatling Fundamentals for Stress Testing APIs - Java
Rating: 4.7 (647 reviews)

Learn the new Java version of the Gatling tool to add stress, load and performance tests to any API

Highest Rated

Created byJames Willett

Last updated 7/2025

English

What you'll learn

Setup, installation and configuration of the Java version of Gatling from scratch, with no prior knowledge required.
Using the Gatling Recorder to convert your API transactions from Swagger, Postman or cURL into a Gatling script
Learn the layout template of a Gatling script and what to add into each section
Explore and write core Gatling script functionality such as adding loops, refactoring code to objects, adding test data through feeders and much more
Create realistic load test scenarios in your Gatling script, and learn how to execute them from the command line
Use the Maven build tool to execute Gatling scripts, and observe your stress test execution in real-time through the command line in Gatling
Analyse the test reports generated by Gatling’s built in reporting tools

Course content

9 sections • 40 lectures • 4h 16m total length

Gatling Introduction5:09
Brief overview and introduction to the Gatling stress testing tool

Section 3 Overview0:39
Overview video of Section 3
Gatling Prerequisites3:01
Go through the prerequisites needed to install Gatling.
Note on upcoming video0:22
Install Gatling via Standalone Download5:14
Install the standalone version of Gatling with the website download
Setup Gatling Development Project with Maven7:15
Setup your Gatling project in the IDE, by cloning a Maven project from the official Gatling repository

Section 4 Overview0:44
Overview of Section 4
Gatling Recorder Overview3:14
Overview of the Gatling recorder and the different options within
Application Under Test5:10
Overview of the application under test for this course, the video game database.
Record a Gatling script with Swagger and the HAR Converter Mode5:29
Learn how to generate a Gatling script by recording a user journey through Swagger and using the HAR converter mode of the Gatling recorder
Record a Gatling script with PostMan and the PROXY mode7:45
Learn how to use the PROXY mode of the Gatling recorder, and record a Gatling script through PostMan

Section 5 Overview0:33
Overview of section 5 of the course.
Your First Gatling Script10:12
Learn the basic layout of a Gatling script, and write your first script from scratch in the IDE
Add Pause Time8:54
Learn how to add pause time into your Gatling scripts
Check Response Code3:48
Learn how to check the HTTP response code
Use JSONPath to check Response Body7:58
Learn how to check text in the HTTP response body by using JSONPath
Use JMESPath to check Response Body9:46
Learn how to use JMESPath in Gatling to check the response body
Extract and Save Data from the Response into a Variable8:27
Learn how to extract data from the response and save it into a variable, for use later on in the script. A concept known as correlation.
Debugging Gatling Session Variables9:11
Learn about some of the different types of session variables in Gatling, and see some techniques for debugging them.
Refactor Gatling code into Methods5:55
Learn how to start refactoring blocks of Gatling code into methods, to take advantage of code reuse in your scripts.
Looping HTTP Calls6:45
Learn how you can make transactions repeat and loop in Gatling
Authentication in Gatling12:08
Learn how to handle authentication in your Gatling script.

Section 6 Overview0:49
Overview video of Section 6
CSV Feeder13:14
Add a CSV feeder into your Gatling script for test data
JSON Feeder5:45
Add a JSON feeder into your Gatling script for test data
Basic Custom Feeder9:19
Learn how to add test data into your script without the need for a static file, by using a custom feeder
Complex Custom Feeder10:18
Expand on the basic custom feeder created previously, to provide more fields for your test data
Programmatic Templating11:10
Learn how to use a template file in your Gatling script, with placeholders for test data that are populated from feeders

Section 7 Overview1:03
Overview video of Section 7
Basic Load Simulation11:04
Overview of load simulations in Gatling, and design a basic load test simulation
Ramp Users Load Simulation7:36
Take advantage of some of the other Gatling DSL methods for load simulations, and design a simulation that ramps the number of concurrent users steadily.
Fixed Duration Load Simulation4:53
Learn how to create a Gatling load simulation that will run for a fixed period of time before terminating.
Executing Gatling scripts on the Command Line with Maven3:18
Learn how use the Maven build tool to execute Gatling scripts from the command line, preparing the way for us to execute our Gatling script in a CI/CD environment.
Runtime Parameters in Gatling Scripts9:41
Learn how to add runtime parameters in your Gatling scripts, allowing you to customise variables that get passed to the Gatling script upon execution.

Section 8 Overview1:03
Overview video of Section 8
Challenge Template6:02
Template with placeholders of the code to be added in the final script
Final Challenge Solution20:09
An example implementation of the final challenge Gatling script
Gatling Test Results6:41
Learn about the statistics available when monitoring Gatling tests, then access and analyse the load test reports that are produced at the end of every Gatling test execution

Requirements

Some basic experience in any computer programming language will be helpful, but not required
Experience of using Java is a plus, although again not required to follow along with the course
Previous experience of any performance testing tool will be a small help, but again not in any way required

Description

Gatling has been around since 2012, and has since grown into a hugely popular open-source tool for stress testing any web application or API. Until recently, Gatling had only been available in Scala, which has hindered many users in adopting the tool.

In 2022, Gatling finally released a Java version of the tool, eliminating the need to use Scala and opening the doors for wide spread adoption.

In this course, you will learn the fundamentals of using the Java version of the Gatling stress testing tool. We will write many Gatling scripts from scratch against a target application created specifically for this course.

Why Gatling?:

Extremely powerful and flexible performance and stress testing solution
An open-source tool, so no cost to use it
Performance testers with Gatling experience are in high demand - yet few Engineers know how to use this tool

Why this course?:

Learn all aspects of the Java version of Gatling including:
- Installation & Configuration, both standalone and in an IDE using the Maven build tool
- Using the Recorder to record your user journey, both with Swagger and Postman
- Writing many Gatling load test scripts from scratch, learning all fundamental concepts
- Analysing test results reports
See how to write many scripts from scratch to become familiar with the process, each script teaches a new concept
Run tests from the command line, including by using the Maven build tool.
Although Gatling scripts are pure Java code, you will see why the excellent Gatling DSL means no real knowledge of Java is required to succeed with Gatling
Resources for learning Gatling are scarce. It can be overwhelming and intimidating trying to learn this tool on your own from scratch. This course is designed to address that

What are the benefits of taking this course?:

Have fun whilst learning a valuable skill & tool
Command a higher salary
Improve your skills and offering as a developer and tester

This course is for any Developer or Quality Engineer that wants to learn how to use the Java version of Gatling for adding performance and stress tests to their test suite.

No prior knowledge of performance testing or software development is required, as I will be walking you through the entire process. However, any prior knowledge or experience that you do have in these domains will be of benefit and will naturally aid learning.

If you want to add an awesome, fully open source performance testing tool that is in high demand across a wide range of software development roles to your skillset, this is the course for you.

Who this course is for:

QA Engineers and Programmers with little or no experience with Gatling
Anyone using an alternative load testing tool like JMeter, LoadRunner or NeoLoad that wants to learn a new tool
Developers looking to add a powerful, fun and intuitive new tool to their knowledge-base

Gatling Fundamentals for Stress Testing APIs - Java

What you'll learn

Explore related topics

Course content

Gatling Introduction1 lecture • 5min

Course Overview1 lecture • 4min

Gatling Prerequisites & Installation5 lectures • 17min

Gatling Recorder5 lectures • 22min

Gatling Script Fundamentals11 lectures • 1hr 24min

Gatling Feeders6 lectures • 51min

Load Simulation Design6 lectures • 38min

Final Script and Gatling Test Results4 lectures • 34min

Conclusion & Next Steps1 lecture • 2min

Requirements

Description

Who this course is for: