In this blog, we will compare two of the most popular performance testing tools: JMeter (both with and without BlazeMeter) and Gatling. Although Gatling is relatively new to the market, it has already established itself as a powerful option in the performance testing arena.  

Inside this blog, you will find comparisons on how to install both tools, the programming languages used in their development, how to write a basic script, reporting capabilities, and the ease of integration with CI/CD tools such as Jenkins and test management tools like TestRail and Bamboo. 

Installation Process: A Step-by-Step Comparison of JMeter and Gatling  

Jmeter: Simplicity is key 

JMeter is simple to set up. You download a binary ZIP file for Windows or a TGZ file for other operating systems. There’s no need for a traditional installation—just unzip the file, and you’ll find a shell script inside to launch JMeter immediately. 

Gatling: Flexible Installation Methods for Developers 

Gatling offers multiple installation methods, allowing developers to choose what best fits their workflow. The easiest way is to use a pre-configured Maven or Gradle Java project, which can be downloaded from the Gatling website. 

Alternatively, developers can manually install and configure Gatling using build tools like Maven, Gradle, or SBT. Gatling also supports a JavaScript option, provided you have Node.js (version 18 or later) and npm (version 8 or later) installed. Additionally, a standalone version is available for offline use. 

Conclusion: 

The key difference lies in simplicity vs flexibility. JMeter offers an easy setup through a downloadable ZIP file, while Gatling provides various methods tailored to developers, including integration with build tools. Gatling also uses an IDE (like IntelliJ), whereas JMeter has its own UI. 

Programming Languages Supported by JMeter and Gatling: Strengths and Differences 

JMeter: Powered by Java 

JMeter is entirely Java-based. All test plans, scripts, and customizations are written in Java, making it an excellent choice for Java developers. 

Gatling: Multi-Language Flexibility 

Gatling supports Java, Scala, Javascript and Kotlin (since version 3.7). Although it started as a Scala-only tool, it has evolved to accommodate multiple languages, giving developers the freedom to work with the language they are most comfortable with. 

Conclusion: 

While both tools support Java, Gatling’s additional support for Scala, Javascript and Kotlin makes it more versatile. However, most users stick to Java for both tools, minimizing the difference in practical terms.  

User Interface: JMeter’s GUI vs Gatling’s IDE Integration 

JMeter: A Basic GUI for Non-Coders 

JMeter uses a graphical user interface for test creation and execution. While the GUI is functional, it’s not the most intuitive or visually appealing, which may feel cumbersome for developers used to modern interfaces, think back to Windows 95 or if generous windows 98. 

Gatling: Seamless Integration with Your Favorite IDE 

Gatling leverages your preferred IDE, such as IntelliJ, for creating and running tests. This approach offers a more streamlined experience for developers, as it eliminates the need to learn a new interface. 

Conclusion: 

For developers, Gatling’s IDE-based workflow is a clear advantage, as it provides familiarity and flexibility. JMeter’s GUI might be preferred by non-developers or those who are comfortable with drag-and-drop configurations. 

Setting Up Your First Performance Test Script: JMeter vs Gatling 

JMeter Script Setup 

To create a basic API call in JMeter: 

1. Add a Thread Group: This defines the number of users and iterations for your test. For example, you might configure a single user to execute one request. 

1. Add a Configuration Element: Select an HTTP Request to define the API call you want to test. 

1. Add a Listener: Use the "View Results Tree" Listener to visualize the results. The Listener displays whether the test succeeded with a green check mark. 

Gatling Script Setup 

In Gatling, everything is code-driven. You create a test by writing a script in Scala, Java, Javascript, or Kotlin. A typical Gatling script includes: 

• Setting up scenarios, such as defining the number of users and their interactions. 

• Defining the HTTP requests and expected responses.  

Conclusion: 

JMeter’s GUI-based approach is more accessible for beginners or non-developers, while Gatling’s code-driven setup is favored by developers who prefer working directly in code for better control and customization. 

Performance Test Reporting: Comparing JMeter and Gatling’s Capabilities 

JMeter Reporting 

JMeter provides basic graphs and listeners for test results. To access advanced reporting features, you can integrate it with BlazeMeter, which provides detailed real-time analytics. However, BlazeMeter is a paid tool and requires a subscription. 

Gatling Reporting 

Gatling generates rich HTML reports out of the box. These reports are interactive, providing detailed insights into the performance of your application without the need for additional paid tools. 

Conclusion: 

For out-of-the-box detailed reporting, Gatling is the better choice. JMeter’s reporting capabilities improve significantly with BlazeMeter, but it adds to the overall cost. 

Pricing 

Gatling Pricing 

Gatling offers both a free open-source version and a paid enterprise version. The enterprise version includes additional features, integrations, and support, with pricing tailored to organizational needs. 

JMeter Pricing 

JMeter is completely free and open-source. However, if you need enhanced reporting, you’ll need BlazeMeter, which requires a subscription.

Conclusion 

Both JMeter and Gatling are powerful performance testing tools, each with distinct advantages. Gatling offers more built-in functionalities and is slightly more cost-effective compared to using JMeter with BlazeMeter. However, if your organization is already invested in JMeter, it might not be practical to switch, as transitioning an entire enterprise to Gatling would require significant effort and resources. 

If you have the flexibility to choose a new tool and a budget to support it, Gatling is a strong contender. Its extensive integration capabilities with other tools, combined with a code-based approach that appeals to developers, make it a highly versatile option. 

Ultimately, the choice depends on your preferences and team expertise. If you value a graphical interface for building tests, JMeter is a solid choice. However, if you prefer to work in code using your favorite IDE and seek robust integration features, Gatling is the ideal tool for creating top-notch performance tests. Both tools are excellent—it's all about finding the right fit for your needs.