Book Image

Master Apache JMeter - From Load Testing to DevOps

By : Antonio Gomes Rodrigues, Bruno Demion (Milamber), Philippe Mouawad
Book Image

Master Apache JMeter - From Load Testing to DevOps

By: Antonio Gomes Rodrigues, Bruno Demion (Milamber), Philippe Mouawad

Overview of this book

Load tests help identify the maximum number of requests a software system can handle. One popular open source tool for load testing is JMeter. By leveraging the features and capabilities of JMeter, you can perform extensive load testing and fix issues in your application before they become problematic. This book is written by JMeter developers and begins by discussing the whole process, including recording a script, setting it up, and launching it, enabling you to almost immediately start load testing. You'll learn the best practices that you must follow while designing test cases. You'll also explore the different protocols offered by JMeter through various real-world examples. Finally, you'll see how to integrate JMeter into the DevOps approach and create professional reports. You'll discover ways to use the eco-system of JMeter to integrate new protocols, enrich its monitoring, and leverage its power through the use of the cloud. By the end of this book, you'll know all that's needed to perform comprehensive load testing on your applications by using all the best practices and features of JMeter.
Table of Contents (14 chapters)

Debugging a script

It can be difficult to debug a simulation script, whatever tool you use. Fortunately, JMeter offers a powerful IDE for debugging these scripts. It is also possible to use plugins.

Using View Results Tree

The easiest way is to use View Results Tree to get the content of queries and responses:

Figure 6.18: View Results Tree

In addition to seeing the content, we can use all the testers available in JMeter.

For every extractor, there is a tester available:

Figure 6.19: List of testers

We can find:

  • CSS Selector Tester
  • JSON Path Tester
  • RegExp Tester
  • Boundary Extractor Tester
  • XPath2 Tester
  • XPath Tester

This allows us to validate our Extractor configuration:

Figure 6.20: RegExp Tester

Capturing Errors

The trick of using the View Results Tree element is useful, but it would be even better if we only recorded samples that were in error.

This is possible with the Log/Display Only -> Errors option: