Apache JMeter is a popular open-source testing software.
JMeter is a Java based application for performance testing.
It is mainly use for testing the Web application or FTP application, but also currently it is applicable in JDBC database connections, functional testing etc.
How Does JMeter Works?
1) Firstly, JMeter simulates a group of users and send request to the target server. 2) Now the Server respond to the requests. 3) After server response, JMeter collect all responses. 4) Once the data is collected, JMeter calculate statistical details. 5) In the end, JMeter returns statistics that show the performance/functionality of the target server/application via tables, graphs, etc.
Why JMeter?
Open-source : It can be download free of cost.
User-friendly : JMeter is easy to use and doesn’t take time to get familiar with it.
Platform Independent : It is pure Java based application so it can run on multiple platforms.
Visualize Test Result: Test results can be display in a different format such as chart, table, tree and log file.
Multiple testing strategy: JMeter supports many testing strategies such as Load Testing, Distributed Testing etc.
Support multi-protocol: All basic protocols such as HTTP, JDBC, LDAP, SOAP, JMS, and FTP are supported by JMeter.
Record & Playback: Record the user activity on the browser and simulate them in a web application using JMeter.
After installation and setting up the environment variable, simply go to terminal and run the command “java -version”
If the Java runtime environment is install successfully, we will see the output as the figure below
If nothing displays, please re-install Java SE runtime environment.
Go to the official website of JMeter and download either zip or tgz
Unzip the zip/tar file into the directory where we want JMeter to be install.
Once the unzipping is done simply just run the file “/bin/jmeter.bat” to start JMeter in GUI mode.
JMeter Elements :
Test Plan : It is the top level body of JMeter and explains sequence of steps execute at run time.
Thread Group : It is a collection of Threads. Each thread represents one user using the application under test. Basically, each Thread simulates one real user request to the server.
LogicControllers : It decide the order of processing of samplers in a thread and also offers a mechanism to control the flow of the thread group.
Test Fragments : Special type of controller that exists on the Test Plan tree at the same level as the thread group element. it is reference by either a Module Controller or an Include Controller.
Listeners : It shows the results of the test execution. They can show results in a different format such as a tree, table, graph or log file.
Timers : Timers in JMeter allow us to define a period to wait between each request.
Assertions : It is used to validate response of the request, that we have sent to the server. Assertion is a process where we verify expected result with the actual result of the request at run time.
Configuration Elements : It allow us to create defaults and variables to be used by Samplers. They are used to add or modify request made by Samplers.
Pre-Processor Elements : A Pre-Processor is use to modify the settings of a Sample Request just before it runs, or to update variables that aren’t extract from response text.
Post-Processor Elements : It execute some action after a sampler request has made. If a Post-Processor is attach to a sampler element, then it will execute just after that sampler element runs.
So this is blog for covering the Basics of JMeter.
I hope you enjoyed it and it helped you!! stay connected for next part of JMeter.
