Book Image

Performance Testing with JMeter 3 - Third Edition

By : Bayo Erinle
Book Image

Performance Testing with JMeter 3 - Third Edition

By: Bayo Erinle

Overview of this book

JMeter is a Java application designed to load and test performance for web application. JMeter extends to improve the functioning of various other static and dynamic resources. This book is a great starting point to learn about JMeter. It covers the new features introduced with JMeter 3 and enables you to dive deep into the new techniques needed for measuring your website performance. The book starts with the basics of performance testing and guides you through recording your first test scenario, before diving deeper into JMeter. You will also learn how to configure JMeter and browsers to help record test plans. Moving on, you will learn how to capture form submission in JMeter, dive into managing sessions with JMeter and see how to leverage some of the components provided by JMeter to handle web application HTTP sessions. You will also learn how JMeter can help monitor tests in real-time. Further, you will go in depth into distributed testing and see how to leverage the capabilities of JMeter to accomplish this. You will get acquainted with some tips and best practices with regard to performance testing. By the end of the book, you will have learned how to take full advantage of the real power behind Apache JMeter.
Table of Contents (17 chapters)
Title Page
About the Author
About the Reviewers
Customer Feedback

Debug Sampler

Debug Sampler generates a sample containing all the values of JMeter variables and/or properties. A View Results Tree listener must be present in the test plan to view its results. This nifty component helps you debug your test plans appropriately, providing you with the tools to analyze the runtime-assigned values of various variables during test execution.

In our aforementioned example, suppose we add a Regular Expression Extractor post processor to the /itunes/charts sampler and store it in a variable; we will be able to view the value assigned to the variable, and more importantly, how to get to the different values if there is more than one match. To add a DebugSampler, right-click on Thread Group and navigate to Add | Sampler | Debug Sampler, as follows:

The Debug Sampler via the View Result Listener

As you can see from the preceding screenshot, the multiple matches are stored under linkclass_n (where n is a match position), followed by the variable name declared in our...