Ten points are used to build the graph, which means that samples are divided in ten groups, and their average response time is calculated. The Spline Visualizer (available in JMeter 2.13 but not in more advanced versions) displays the change of the response time over the course of the test, in the form of a graph. This listener is useful for getting a quick estimation of the behaviour of the system under test. Results in the table are in the order the time samples were issued. The table shows time related data for each sample, the payload data, the thread number and the sample execution result. The View Result in Table listener displays information about each sample in the form of a table. An example is shown in the screenshot below. However, if the assertion passes the success is not displayed. The View Results Tree listener also displays failed assertions, and compares expected and actual results. This helps constructing and validating the following corresponding PostProcessors in the script.Īn example of using the RegExp tester in the View Results Tree listener is shown in the screenshot below. It also filters substrings, by using RegExp patterns, specific XPath, JSON Path or CSS. One of the most useful elements of the View Results Tree listener is a tab that renders information transmitted in the sample body into the required format: simple text, HTML, or XML. The Response data tab contains the response body of the sample. The Request tab contains information about headers that the JMeter script added, the URL, the HTTP method and cookie information. The Sampler result tab contains the response code, headers, cookies and information about time, latency, response size in bytes - separately for the headers, the body and the error count. This is displayed under the corresponding tabs: sampler result, request, and response data. This listener displays the samples in the order they are generated by the JMeter script ,and provides parameters and data for each of them.įor instance, for each sample the HTTP sampler produces, the View Results Tree listener provides the request parameters, response parameters and the response data. The View Results Tree listener displays samples that the JMeter samplers generate, and the assertion results that are related to these samples. This is illustrated in the screenshot below: If you need to review reports of all the samplers in a script, place the listener at the same level of all thread groups in the script. If a listener is added under a thread group of a script that has a few thread groups, that listener will display the data of all the samplers that belong to that thread group. If a listener is added to the script as a child element, it will only show the data related to its parent. A JMeter Listener will only collect data from JMeter elements at or above its level. Placing JMeter Listeners in a Test ScriptĪll Listeners can be found by clicking Add->Listeners. Placing JMeter Listeners in a Test Script.But first, we’ll explain where to place Listeners in a test script. Part 2 is about listeners that aggregate data samples. This time we will go over listeners that collect and display data from samples in a basic format, without conducting any complex calculations or manipulations. This blog post series will go over the different types of Listeners. Nearly all listeners have the ability to write results to a file, allowing performance engineers to transform them to the format they need for analysis. Advanced testers can even use BeanShell or JSR223 listeners to customize the collection and to consolidate performance test metrics. Listeners aggregate time and capacity related information that JMeter collects from requests and responses, or deal with statistical information like distribution and percentage. The variety of JMeter listeners enables performance engineers to monitor the requests sent from JMeter as well as to analyze the responses received from the system under test. But there is more to them than just that. JMeter Listeners are the JMeter component that displays test results.
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