Jmeter

JMeter is a load testing tool for analyzing and measuring performance. If you are preparing for the role of Performance test engineer, then you will find these interview question on JMeter helpful for your next job interview.



Q.1 Explain the architecture of Jmeter.

Jmeter is an open source application which is Java based, designed for the purpose of Load Testing.

Jmeter supports all major protocols which are supported in Load Runner. But unlike any browser, Jmeter works on different levels of protocols and does not execute JavaScript present in HTML web pages.

Report This Question
Q.2 How can Jmeter simulate actual browser behavior?

Jmeter does not support the actual browser behavior as it does not render the HTML webpages as the normal browser.

Such that response can be seen in HTML format but the actual timings are not there in the generated samples.

Report This Question
Q.3 What is the use of Regular Expression in Jmeter?

Regular Expression in Jmeter is used for extracting some values dynamically from the responses with an objective to use to it in the subsequent request or save it for reporting purposes.

Regular Expression is used in both Pre-Processors as well as Post Processors.

Report This Question
Q.4 What are the different methods used in Data Parametrization in Jmeter?

The objective of data parametrization is to make the scripts reusable where the values need not be hardcoded for the same request with different parameters.

The data parametrization that is supported in JMeter are -

1. CSV Data Set Config

2. User Defined Variables

Report This Question
Q.5 How many maximum threads are recommended on a single system?

The recommendation of maximum threads on a single system is based on the hardware configuration of the system which includes a processor, JVM, allocated memory -Xmx, etc.

There are other factors as well that impact this such as the number of components in the test plan like the number of config elements or processors and it also depends on whether you are using GUI/Non-GUI Mode.

Report This Question
Q.6 What is the difference between Gaussian and Poisson Timers?

Since both Gaussian and Poisson Timers work on a mathematical formula that has some constant delay and additional offset.

The point of difference between the Gaussian and Poisson Timers is because of in the fact that the lambda value is calculated in case of Poisson timer and deviation is calculated in case of Gaussian Timer.

Report This Question
Q.7 What is the primary use of co-relation in Jmeter?

Co-relation is basically a process in which the values can be extracted from the server response and stored in a variable which is then then used in any other request which is to follow.

For instance in order to test any login functionality if you have to use session ID/cookie ID , you can then extract the value from the response of GET request of the login page and then dynamically use the same while making POST request for login.

Report This Question
Q.8 What is the purpose of listeners?

Listeners are majorly used for storing the execution results of load testing in different forms like table, graph, tree or in any other presentable format which can be presented to the client.

There are different type of inbuilt listeners in Jmeter and many others can be imported into it by using plugins as per the requirement.

There are some inbuilt listeners like View Results in Table, View Results Tree, Graph Results, Aggregate Graph, Aggregate Report, Assertion Results and Response Time Graph.

Report This Question
Q.9 What will be flow of Test Script Recorder?

The Test Script Recorder is majorly used to record all the http(s) request which is going to the server from the application. Such that there are some other configurations that are required to be done in Jmeter in order to make it functional.

We should follow the following steps to record https traffic

1. Firstly add HTTP(s) Test Script Recorder to WorkBench.

2. Then enter the port number which you want to start your proxy server from.

3. Thirdly select the Target either as “Workbench” only or add a Recording Controller in the test plan and select the same as Target so that all the recordings are stored under it.

4. Next start the Proxy Server.

5. Lastly configure the browser with manual proxy settings pointing to the same port number used in the test script recorder.

Report This Question
Q.10 How can Jmeter record actions from Mobile?

Jmeter can record HTTP or https request going to the server from your mobile application also. Therefore Mobile and Jmeter should be on the same network.

The configuration required to record actions from Mobile,

1. First configure the proxy server in JMeter to run at a specified port.

2. Second set up a proxy on the mobile wifi settings and then enter the same port number that is used in the recorder.

3. Third install the Root CA certificate on the mobile.

4. Fourth hit server request from the mobile and observe it getting captured by the specified controller.

Report This Question
Q.11 How would you do master-slave configuration in Jmeter?

Master-Slave configuration is considered as a part of Distributed Testing in which case more than one machine is used to perform load testing of the server under test. Such that it becomes important that all machines are on the same network and all have the same version of Jmeter. Also in distributed testing, one machine is made as the Master and the others are kept as slaves by doing some configurations.

Steps to perform master-slave configuration are -

1. Edit the jmeter.properties file on the master machine, and add the IP addresses of slave machines against the remote_host field in the file.

2. Next save the file and open the Jmeter again.

3. Now from the RUN menu in Jmeter, select Remote Start and choose the IP of the machine to be invoked.

4. Choose RUN menu and select Remote Start all to start all the slave machines for testing.

Report This Question
Q.12 Would you recommend to run Jmeter in GUI Mode?

Indeed, Jmeter tests can be run both GUI as well as Non-GUI Mode.

But it is recommended to run the load test in Non-GUI mode since AWT Event Thread can kill the tests in case of high load scenarios.

Some of the Non-GUI mode supported with Jmeter such as - Command Line, ANT Plugin, MAVEN Plugin, and Jenkins.

Report This Question
Q.13 Can to run Selenium scripts in Jmeter?

We can run selenium scripts in Jmeter to get some ideas on their performance.

This can be done by either using Junit libraries to build Selenium scripts and save as Jars and copy the same in Jmeter directory. Else add Junit sampler to the test plan and import the Jar file.

Otherwise, we can add the Webdriver sampler plugin in the JMeter ext folder and then restart the Jmeter. We can then write the selenium code in the Webdriver sampler and then execute to see the performance.

Report This Question
Q.14 How can we manage session and cookies in Jmeter?

We can manage the sessions and cookies in Jmeter by using config elements like HTTP Cache Manager which provides an option to clear the cookies in every iteration and also allows to add user-defined cookies.

The HTTP Cache manager primarily helps you in clearing cache after each iteration as per your requirement in the load tests and thereby limit the number of elements that can be stored in the cache. In which case both the config elements can be attached to the HTTP sampler.

Report This Question
Q.15 Let us suppose I have multiple screens in my mobile app. Then can Jmeter measure the time taken to flip the screens or can Jmeter measure the performance of a complete application?
At no point of time Jmeter measure the transition time between the screens. As it can only measure the server actions not the UI interactions.
Report This Question
Q.16 What is the use of Workbench?

Workbench is primarily used as a storage area for adding components that can be added to test plan as and when required.

Such that the components of workbench does not get saved with the test plan automatically. They have to be saved separately as test fragments.

Workbench is known for HTTP(s) Test script recorder which is extremely useful in recording the https request and later load can be applied on them to measure the response time.

Report This Question
Q.17 Which programming language does JMeter is based on?
Jmeter is based on Java programming language and not on other programming languages.
Report This Question
Q.18 Which XML parser is present in Jmeter?
JMeter comes with Apache's Xerces XML parser and not with other listed options.
Report This Question
Q.19 What is the default protocol used when testing a web server using SSL encryption?
TLS is used when testing a web server using SSL encryption
Report This Question
Q.20 Which file extension is accepted by JMeter for JDBC driver?
Jar
Report This Question
Q.21 What is the first step you want to do with every JMeter FTP Test Plan?
Add jmeter.properties file in lib
Report This Question
Q.22 What happens if an undefined function or variable is referenced?
If an undefined function or variable is referenced, JMeter does not report/log an error - the reference is returned unchanged.
Report This Question
Q.23 How many JMS samplers can be used in Jmeter?
1
Report This Question
Q.24 What is the default port for LDAP over SSL
The default port for LDAP over SSL is 625
Report This Question
Q.25 What are the different types of tests that can be performed using JMeter?
JMeter can perform several types of tests, including load testing, stress testing, functional testing, and regression testing.
Report This Question
Q.26 What is a thread group in JMeter?
A thread group is a collection of users that simulate the behavior of real users. It is the main element that controls how JMeter will send requests to a server.
Report This Question
Q.27 What is the purpose of a sampler in JMeter?
A sampler is used to send requests to a server and to collect responses from the server.
Report This Question
Q.28 What is the difference between a thread and a user in JMeter?
A thread is a virtual user that simulates the behavior of a real user. A user is a real person who interacts with an application.
Report This Question
Q.29 What is a listener in JMeter?
A listener is used to collect and display the results of a test run.
Report This Question
Q.30 What is a timer in JMeter?
A timer is used to control the time delay between requests.
Report This Question
Q.31 How can you parameterize a request in JMeter?
You can parameterize a request by using variables. Variables can be defined in JMeter and used in requests.
Report This Question
Q.32 What is correlation in JMeter?
Correlation is used to extract dynamic values from a response and use them in subsequent requests.
Report This Question
Q.33 What is assertion in JMeter?
Assertion is used to verify that a response meets certain criteria, such as the presence of a particular string in the response.
Report This Question
Q.34 What is throughput in JMeter?
Throughput is the number of requests that can be processed in a given time.
Report This Question
Q.35 What is latency in JMeter?
Latency is the time taken for a request to reach the server and get a response.
Report This Question
Q.36 What is ramp-up time in JMeter?
Ramp-up time is the time taken for all the threads in a test group to start making requests.
Report This Question
Q.37 What is the purpose of a CSV data set config in JMeter?
A CSV data set config is used to read data from a CSV file and use it in requests.
Report This Question
Q.38 How can you distribute load across multiple servers using JMeter?
You can use the distributed testing feature in JMeter to distribute load across multiple servers.
Report This Question
Q.39 What is the purpose of the HTTP cookie manager in JMeter?
The HTTP cookie manager is used to manage cookies sent by the server.
Report This Question
Q.40 What is the purpose of the HTTP header manager in JMeter?
The HTTP header manager is used to manage HTTP headers in requests.
Report This Question
Q.41 What is the purpose of the transaction controller in JMeter?
The transaction controller is used to group several requests into a single transaction.
Report This Question
Q.42 What is the purpose of the constant throughput timer in JMeter?
The constant throughput timer is used to control the rate at which requests are sent to a server.
Report This Question
Q.43 What is the purpose of the summary report listener in JMeter?
The summary report listener is used to display the summary of the test results. It shows the number of requests, average response time, and more.
Report This Question
Q.44 What is the purpose of the JMeter plug-in manager and how can you use it?
The JMeter plug-in manager is a tool that allows you to install and manage JMeter plug-ins. You can use it to add new functionality to JMeter, such as additional samplers or listeners.
Report This Question
Q.45 How can you test an application that requires user authentication in JMeter?
You can test an application that requires user authentication by using the HTTP authorization manager in JMeter. This manager allows you to specify the credentials required for authentication.
Report This Question
Q.46 What is the purpose of the JMeter script recorder and how can you use it?
The JMeter script recorder is a tool that allows you to record user interactions with a web application and create a JMeter test plan based on those interactions. You can use it to quickly create a test plan for a web application.
Report This Question
Q.47 How can you simulate a realistic user load in JMeter?
You can simulate a realistic user load in JMeter by using a combination of thread groups, ramp-up time, and loop counts. You can also use the pacing timer to simulate realistic think time between requests.
Report This Question
Q.48 What is the purpose of the JMeter command-line interface and how can you use it?
The JMeter command-line interface allows you to run JMeter tests from the command line, which is useful for automating tests and integrating JMeter with other tools. You can use it to run tests in headless mode, or to run tests as part of a continuous integration pipeline.
Report This Question
Q.49 How can you use JMeter to test an API?
You can use JMeter to test an API by creating HTTP requests that correspond to the API endpoints, and by specifying the required parameters in those requests. You can use assertions to verify that the responses meet the expected criteria.
Report This Question
Q.50 What is the purpose of the JMeter dashboard report and how can you generate it?
The JMeter dashboard report is a customizable report that displays the results of a JMeter test run in a visual format. You can generate it by using the JMeter command-line interface or by using the JMeter GUI.
Report This Question
Q.51 What is the purpose of the JMeter distributed testing feature and how can you use it?
The JMeter distributed testing feature allows you to run a test plan on multiple JMeter instances, which can be useful for testing applications that require a large number of virtual users. You can use it by setting up a master-slave configuration and distributing the test plan among the slave nodes.
Report This Question
Q.52 How can you use JMeter to test the performance of a database server?
You can use JMeter to test the performance of a database server by using the JDBC request sampler to send SQL queries to the server. You can use listeners to collect and display the results of the test.
Report This Question
Q.53 How can you use JMeter to test the performance of a web service?
You can use JMeter to test the performance of a web service by creating SOAP or REST requests that correspond to the service operations, and by specifying the required parameters in those requests. You can use assertions to verify that the responses meet the expected criteria.
Report This Question
Q.54 What is the purpose of the JMeter variable and how can you use it in your test plan?
JMeter variables allow you to store and reuse values throughout your test plan, which can be useful for parameterization and data-driven testing. You can use variables to store values extracted from responses, to generate random data, or to read data from external sources such as CSV files.
Report This Question
Q.55 How can you simulate a realistic network bandwidth in JMeter?
You can simulate a realistic network bandwidth in JMeter by using the bandwidth shaping timer. This timer allows you to specify the desired network speed and latency for your requests, which can be useful for testing applications that rely on slow or unstable connections.
Report This Question
Q.56 What is the purpose of the JMeter cookie manager and how can you use it?
The JMeter cookie manager is a tool that allows you to manage cookies in your test plan. You can use it to simulate user sessions that rely on cookies, or to manipulate cookies for testing purposes.
Report This Question
Q.57 How can you use JMeter to test the performance of a streaming service?
You can use JMeter to test the performance of a streaming service by using the TCP sampler to send and receive data over a socket connection. You can use listeners to collect and display the results of the test.
Report This Question
Q.58 What is the purpose of the JMeter assertion and how can you use it in your test plan?
JMeter assertions allow you to verify that the responses of your requests meet certain criteria, which can be useful for ensuring the correctness of your application. You can use assertions to check for the presence or absence of specific text or patterns in the response, to verify the status code or headers of the response, or to validate the XML or JSON structure of the response.
Report This Question
Q.59 How can you use JMeter to test the performance of a streaming video service?
You can use JMeter to test the performance of a streaming video service by using the HTTP request sampler to simulate the requests made by a video player, and by using the TCP sampler to simulate the data transfer. You can use listeners to collect and display the results of the test.
Report This Question
Q.60 How can you use JMeter to test the performance of a messaging service?
You can use JMeter to test the performance of a messaging service by using the JMS point-to-point or pub-sub samplers to send and receive messages. You can use listeners to collect and display the results of the test.
Report This Question
Q.61 What is the purpose of the JMeter regular expression extractor and how can you use it in your test plan?
The JMeter regular expression extractor allows you to extract specific values from the response of your requests, which can be useful for parameterization and data-driven testing. You can use regular expressions to specify the patterns to match and the groups to capture.
Report This Question
Q.62 How can you use JMeter to test the performance of a mobile application?
You can use JMeter to test the performance of a mobile application by capturing and analyzing the network traffic generated by the application, and by using the appropriate JMeter samplers to simulate that traffic. You can use listeners to collect and display the results of the test.
Report This Question
Q.63 What is the purpose of the JMeter timer and how can you use it in your test plan?
JMeter timers allow you to specify the pacing and concurrency of your requests, which can be useful for simulating realistic user behavior. You can use timers to introduce think time between requests, to simulate bursts of traffic, or to synchronize multiple requests.
Report This Question
Q.64 How can you use JMeter to test the performance of a web application that uses WebSockets?
You can use JMeter to test the performance of a web application that uses WebSockets by using the WebSocket sampler to send and receive messages over a WebSocket connection. You can use listeners to collect and display the results of the test.
Report This Question
Q.65 How can you use JMeter to test the performance of a web application that uses AJAX?
You can use JMeter to test the performance of a web application that uses AJAX by using the HTTP request sampler to simulate the requests made by the browser, and by using the Regular Expression Extractor to extract the values needed for subsequent requests. You can use listeners to collect and display the results of the test.
Report This Question
Q.66 How can you use JMeter to test the performance of a RESTful web service?
You can use JMeter to test the performance of a RESTful web service by using the HTTP request sampler to send HTTP requests to the service, and by using the JSON Path Extractor to extract the values needed for subsequent requests. You can use listeners to collect and display the results of the test.
Report This Question
Q.67 How can you use JMeter to test the performance of a SOAP web service?
You can use JMeter to test the performance of a SOAP web service by using the SOAP/XML-RPC Request sampler to send SOAP requests to the service, and by using the XPath Extractor to extract the values needed for subsequent requests. You can use listeners to collect and display the results of the test.
Report This Question
Q.68 How can you use JMeter to test the performance of a database?
You can use JMeter to test the performance of a database by using the JDBC Request sampler to execute SQL statements against the database, and by using the Result Set Handler to extract the results of the query. You can use listeners to collect and display the results of the test.
Report This Question
Q.69 What is the purpose of the JMeter user parameter and how can you use it in your test plan?
JMeter user parameters allow you to specify custom variables for each user in your test plan, which can be useful for simulating realistic user behavior. You can use user parameters to store user-specific data such as usernames, passwords, or session IDs.
Report This Question
Q.70 How can you use JMeter to test the performance of a website with multiple user roles?
You can use JMeter to test the performance of a website with multiple user roles by using the CSV Data Set Config element to read data from a CSV file that contains different login credentials for each user role, and by using the User Defined Variables element to define variables for each role. You can use listeners to collect and display the results of the test.
Report This Question
Q.71 How can you use JMeter to test the performance of a website with dynamic content?
You can use JMeter to test the performance of a website with dynamic content by using the Regular Expression Extractor to extract the dynamic values needed for subsequent requests, and by using the While Controller to repeat the requests until the expected response is received. You can use listeners to collect and display the results of the test.
Report This Question
Q.72 How can you use JMeter to test the performance of a website with multiple language versions?
You can use JMeter to test the performance of a website with multiple language versions by using the CSV Data Set Config element to read data from a CSV file that contains different language preferences for each user, and by using the HTTP Header Manager to set the Accept-Language header for each request. You can use listeners to collect and display the results of the test.
Report This Question
Q.73 How can you use JMeter to test the performance of a website with SSL/TLS encryption?
You can use JMeter to test the performance of a website with SSL/TLS encryption by importing the SSL/TLS certificate into the JMeter keystore, and by setting the protocol and cipher suites in the SSL Manager. You can use listeners to collect and display the results of the test.
Report This Question
Q.74 How can you use JMeter to test the performance of a website with multiple authentication methods?
You can use JMeter to test the performance of a website with multiple authentication methods by using the HTTP Authorization Manager to set the authentication credentials for each request, and by using the If Controller to handle different response codes for successful and unsuccessful authentication. You can use listeners to collect and display the results of the test.
Report This Question
Q.75 How can you use JMeter to test the performance of a website with CAPTCHA protection?
You can use JMeter to test the performance of a website with CAPTCHA protection by using a third-party service such as DeathByCaptcha or 2Captcha to bypass the CAPTCHA challenge, and by using the Regular Expression Extractor to extract the response token needed for subsequent requests. You can use listeners to collect and display the results of the test.
Report This Question
Q.76 How can you use JMeter to test the performance of a website with rate limiting?
You can use JMeter to test the performance of a website with rate limiting by using the Constant Throughput Timer to set the maximum number of requests per second, and by using the Response Assertion to handle the rate limit exceeded error. You can use listeners to collect and display the results of the test.
Report This Question
Q.77 How can you use JMeter to test the performance of a website with IP address restrictions?
You can use JMeter to test the performance of a website with IP address restrictions by using a proxy server such as Charles Proxy or Fiddler to intercept and modify the IP address of the requests, and by using the Regular Expression Extractor to extract the response token needed for subsequent requests. You can use listeners to collect and display the results of the test.
Report This Question
Q.78 How can you use JMeter to test the performance of a website with complex workflows?
You can use JMeter to test the performance of a website with complex workflows by using the Transaction Controller to group together related requests, and by using the Logic Controllers such as the If Controller and the While Controller to handle conditional and looping behavior. You can use listeners to collect and display the results of the test.
Report This Question
Q.79 How can you use JMeter to test the performance of a website with heavy server-side processing?
You can use JMeter to test the performance of a website with heavy server-side processing by using the Constant Timer to add think time between requests, and by using the BeanShell Sampler to execute custom Java code that can simulate the processing load. You can use listeners to collect and display the results of the test.
Report This Question
Q.80 How can you use JMeter to test the performance of a website with rich media content?
You can use JMeter to test the performance of a website with rich media content by using the HTTP Request Sampler to simulate the requests made by the browser, and by using the HTTP Cache Manager to simulate the browser cache. You can use listeners to collect and display the results of the test.
Report This Question
Q.81 How can you use JMeter to test the performance of a website with third-party integrations?
You can use JMeter to test the performance of a website with third-party integrations by using the HTTP Request Sampler to simulate the requests made to the third-party services, and by using the JSR223 Sampler to execute custom code that can handle the responses.
Report This Question
Q.82 What is Apache JMeter testing?

Apache JMeter testing involves using the open source Apache JMeter software for testing of software application. Apache JMeter testing is applied for performance check of both static and dynamic resources.  Apache JMeter simulates a heavy load on application, to test its strength or to analyze overall performance under different load types.

Apache JMeter is widely used for performance testing of web applications. Apache JMeter is open source software and made in Java programming language.

Report This Question
Q.83 Is JMeter easy to learn?

Yes, Apache JMeter is very easy to learn if you are conversant with Java programming language. Detailed documentation with examples and use cases are listed on Apache JMeter website at link - https://ApacheJMeter.apache.org/index.html

Various websites also list tutorials, videos and examples on using Apache JMeter, as - https://www.vskills.in/certification/tutorial/information-technology/ApacheJMeter-tester-certification/

Report This Question
Q.84 How JMeter is used for performance testing?

Apache JMeter tests performance by load testing the functional behavior of software application and measuring performance. Apache JMeter tests performance both on static and dynamic resources. Apache JMeter is widely used for performance testing of web applications.

Apache JMeter simulates a heavy load on application, to test its strength or to analyze overall performance under different load types.

Conducting performance testing by Apache JMeter requires, Apache JMeter test plan to be created. A Apache JMeter test plan lists steps which Apache JMeter will run, when Apache JMeter is executed.

A Apache JMeter test plan has

  • Thread Groups
  • logic controllers
  • sample generating controllers
  • listeners
  • timers
  • assertions
  • configuration elements

Report This Question
Q.85 What is JMeter and how it works?

JMeter is actually, Apache JMeter and is open source software application to conduct performance test on software applications. Apache JMeter is extensively used for performance testing of web applications.

Apache JMeter works by executing a test plan, made by test engineer or manager. The Apache JMeter test plan lists steps to execute. A Apache JMeter test plan has

  • Thread Groups
  • logic controllers
  • sample generating controllers
  • listeners
  • timers
  • assertions
  • configuration elements

Apache JMeter can conduct multiple test types, for Web (HTTP/HTTPS), FTP, JDBC, LDAP, Database, Mail (SMTP/POP3) , REST.

Report This Question
Q.86 Which is better LoadRunner vs JMeter?

JMeter is better, considering no purchase cost, huge support and available documentation.

JMeter also scores more against LoadRunner as, JMeter can

  • conduct multiple test types, for Web (HTTP/HTTPS), FTP, JDBC, LDAP, Database, Mail (SMTP/POP3), REST.
  • supports multiple operating system
  • based on popular Java programming language
  • has CLI and GUI mode
Report This Question
Q.87 Does JMeter require coding?

To a minimum, Apache JMeter GUI minimizes the amount of coding needed to prepare a test plan.  Apache JMeter does performance testing by executing test plans. Preparing the Apache JMeter test plan in central to Apache JMeter.

But validation, verification or customization of test plan require coding for quick and effective Apache JMeter testing.

Report This Question
Q.88 Why JMeter is better than LoadRunner?

Apache JMeter is better than LoadRunner as

  • being open source no purchase cost is involved
  • documentation and huge support for Apache JMeter present globally by volunteers
  • easily customized as per need


Apache JMeter also can

  • Do multiple test types, for Web (HTTP/HTTPS), FTP, JDBC, LDAP, Database, Mail (SMTP/POP3), REST.
  • runs on multiple operating system
  • uses popular Java programming language
  • provides both CLI and GUI mode
Report This Question
Q.89 Which language is used in JMeter?

Apache JMeter uses Java programming language.  

Apache JMeter tests performance by executing test plans.  Apache JMeter GUI reduces coding to prepare a test plan. With Apache JMeter GUI very less coding in Java programming language, is needed.

Apache JMeter tests the functional behavior of software application and measures its performance. Apache JMeter tests performance both on static and dynamic resources. Apache JMeter is widely used for performance testing of web applications.

Report This Question
Q.90 Why do we use JMeter?

Apache JMeter does performance testing by load testing the functional behavior of the software application and measures performance. Apache JMeter tests performance both on static and dynamic resources. Apache JMeter is widely used for performance testing of web applications.

Apache JMeter is used by users across the globe due to

  • Open source, no purchase cost
  • Wide availability of tutorials, videos, etc
  • Extensive documentation
  • Worldwide volunteers resolve issues

Report This Question
Q.91 How do I start Apache JMeter?

Apache JMeter can be started in CLI Mode and GUI Mode

Execute jmeter.bat (on Windows) or jmeter (for Unix/Linux) file in bin directory. By default GUI Mode opens up.

For CLI or command line mode run the above files in bin directory, with –n flag.

CLI mode is used to run the test plans.

Report This Question
Q.92 Can JMeter be used for .NET applications?

Yes, Apache JMeter tests the functional behavior of .Net application and its performance. Apache JMeter tests performance both on static and dynamic resources. Apache JMeter is widely used for performance testing of web applications.

Apache JMeter can be used for

  • Load Testing ASP.NET Sites
  • Load Testing ASP.NET Web Applications
  • Stress Testing ASP.NET
  • Sending HTTP POST Request to an ASP.NET web-site
  • ASP.NET WebForms Authentication
Report This Question
Q.93 What is JMeter in selenium?

Both, Apache JMeter and Selenium can be integrated. Using Selenium in Apache JMeter, by using Apache JMeter WebDriver plugin.

Copy the files of WebDriver plugin to libs and ext directory of Apache JMeter. In Apache JMeter GUI, web browser specific tests can be executed like Chrome test / Firefox test, etc.

Report This Question
Q.94 Is JMeter used for functional testing?

Yes, Apache JMeter can test functional behavior of software application and its performance. Apache JMeter tests performance both on static and dynamic resources. Apache JMeter is widely used for performance testing of web applications.

Apache JMeter is open source software and hence user can customize as per their needs.

Report This Question
Q.95 How many users can JMeter simulate?

Apache JMeter can simulate unlimited number of users.

Number of users is specified by the number of threads, in a test plan.  

But, remember that the thread count is limited by the hardware resources of the computer machine the test is conducted and number of file descriptors else, testing speed will degrade.

Limitation can be circumvented by conducting distributed Apache JMeter tests or using cloud solutions.

Report This Question
Q.96 Can we automate JMeter?

Yes, we can automate Apache JMeter.

Automation can be implemented in Apache JMeter by

  • Integrating with Maven under continuous testing of DevOps
  • Using Apache JMeter GUI for test plan creation, reducing test plan development.
  • Saving and managing frequent test plans
  • Using Robotic Process Automation tool

Report This Question
Q.97 Who uses JMeter?

Apache JMeter is used by software development companies across the globe like IBM, Oracle, Capgemini, TCS, etc.

Apache JMeter is used to test functional behavior of software application and its performance. Apache JMeter tests performance both on static and dynamic resources. Apache JMeter is widely used for performance testing of web applications.

Report This Question
Q.98 Can JMeter be used for API testing?

Yes, Apache JMeter supports testing of SOAP / REST Web services.

Performance testing of RESTful API can be done by Apache JMeter.

Report This Question
Q.99 Who developed JMeter?

Stefano Mazzocchi, working at Apache Software Foundation, developed Apache JMeter.

Apache Software Foundation later redesigned Apache JMeter’s GUI and to added functional-testing capabilities.

Apache JMeter is open source software and hence user can customize as per their needs.

Report This Question
Q.100 Is JMeter a good tool?

Yes, of course Apache JMeter is a good tool.

Apache JMeter is good tool because

  • Open source so, no purchase cost
  • Can do multiple test types, for Web (HTTP/HTTPS), FTP, JDBC, LDAP, Database, Mail (SMTP/POP3), REST.
  • runs on multiple operating system
  • uses popular Java programming language
  • provides both CLI and GUI mode
Report This Question
Q.101 Which tool is best for performance testing?

Apache JMeter is the best tool for performance testing.

Apache JMeter scores the most marks as

  • Open source so, no purchase cost
  • Can do multiple test types, for Web (HTTP/HTTPS), FTP, JDBC, LDAP, Database, Mail (SMTP/POP3), REST.
  • runs on multiple operating system
  • uses popular Java programming language
  • provides both CLI and GUI mode
Report This Question
Q.102 Is JMeter an automation tool?

Yes, Apache JMeter is automation tool which automates performance testing.

You can easily create a test plan or steps for executing a performance test on software application by Apache JMeter GUI.

You can also integrate Apache JMeter with Maven for continuous testing under DevOps and automate performance testing.

Report This Question
Q.103 Is coding required for performance testing?

Yes, depending upon performance testing tool being used.

Apache JMeter performance testing tool is open source toll which has very low coding requirement. Apache JMeter GUI minimizes the amount of coding needed to prepare a test plan.  Apache JMeter does performance testing by executing test plans. Preparing the Apache JMeter test plan in central to Apache JMeter.

But validation, verification or customization of test plan require coding for quick and effective Apache JMeter testing.

Report This Question
Q.104 What is JMeter script?

Apache JMeter script stores actions a user would take in the application being tested. This helps in validating user behavior and application performance under different load conditions.

Script helps in replaying user actions so as to better test the application for more used functionality of the software application.

Report This Question
Q.105 How do I open JMeter in non GUI?

For opening Apache JMeter in non GUI or CLI (command line )mode run Apache JMeter.bat (on Windows) or Apache JMeter (for Unix/Linux) file in bin directory, with –n flag.

Non GUI or CLI mode is used to run the test plans.

Report This Question
Q.106 What is JTL file in JMeter?

JTL file in Apache JMeter, is the Apache JMeter Text Logs or JTL files. It stores result of the test runs.

JTL is the default extension and any other extension can also be selected before test execution.

If same JTL file is mentioned for different test runs, Apache JMeter appends resultant data at end of the same file.

Report This Question
Q.107 How do I record in JMeter?

Apache JMeter can record tests by using the Test Script Recorder. The web browser used to record user actions, should be configured to use proxy server for web requests.

Steps for recording in Apache JMeter -

1.    Select Recording template in Apache JMeter GUI
2.    Configure  HTTP Request Defaults element
3.    Click Start button in HTTP(S) Test Script Recorder
4.    Configure browser to use the Apache JMeter Proxy
5.    Record user actions by clicking Run then, Start

Report This Question
Q.108 What is the latest JMeter version?

The latest Apache JMeter version is 5.1.1, as on date and was released on 19-March, 2019.

The latest Apache JMeter version 5.1.1, requires Java 8 and above.

The Apache JMeter version 5.1.1 has further enhancement from the base version of Apache JMeter version 5

Apache JMeter is open source software and hence user can customize as per their needs.

Report This Question
Q.109 What is throughput in JMeter?

Throughput is, number of incoming requests being served or successfully processed and output sent, as per set parameters, with in a time span like seconds or minutes or even hours.

As per Apache JMeter documentation,  throughput is requests/unit of time.

In Apache JMeter the unit of time taken for calculating the throughput, is from start of the first sample to the end of the last sample. This time span includes intervals between samples.

The Apache JMeter throughput formula is: Throughput = (number of requests) / (total time).

Report This Question
Q.110 What we can do with JMeter?

We can do performance testing with Apache JMeter . Apache JMeter is an open source software application. Apache JMeter can do load testing of the functional behavior of the software application under test. Apache JMeter  also logs the test result for measuring the performance.

Apache JMeter can be used to test performance both on static and dynamic resources.

Apache JMeter has extensive usage in performance testing of web applications.

Report This Question
Q.111 How does JMeter calculate concurrent users?

Concurrent users in Apache JMeter points to multiple users doing same operation at same time like 100s of users logging into software application, at same time or concurrently.

Number of threads in Apache JMeter simulates concurrent connection to the application under test. It can be configured in Apache JMeter test plan for conducting concurrent users test. Configure concurrent thread group for concurrent users in Apache JMeter.

Calculating concurrent users, is bit tricky as we can only guess the number of concurrent users and it will be good if we make a guess objectively.  Calculating concurrent users in Apache JMeter can be done by dividing unique visitors by their visit duration like 100 unique visitors per minute with 10 minutes per visit results in 10 concurrent user per minute (100/10).

Report This Question
Q.112 How many threads can JMeter handle?

Apache JMeter can handle unlimited threads as it is influenced by hardware capabilities and test plan design.  

Correctly sizing the number of threads in Apache JMeter prevents memory related issues

Distributed or cloud based testing can circumvent hardware capabilities but test plan design is crucial in threads Apache JMeter can handle.

We can specify Number of threads in Apache JMeter. Multiple threads simulate concurrent connection to application under test.

Report This Question
Q.113 What are JMeter threads?

Apache JMeter thread execute test plan entirely and independently of other threads. Each Apache JMeter thread usually indicates a single user, interacting with application under test.

Apache JMeter thread is controlled by Apache JMeter thread group by setting following options

  • Number of Apache JMeter threads
  • Ramp up period for Apache JMeter thread
  • Number of times test should be executed

Report This Question
Q.114 Can we integrate selenium with JMeter?

Yes, Apache JMeter and Selenium can be integrated. Use Selenium in Apache JMeter, by making use of Apache JMeter WebDriver plugin.

Copy the files of WebDriver plugin to libs and ext directory of Apache JMeter. In Apache JMeter GUI, web browser specific tests can be executed like Chrome test / Firefox test, etc.

Report This Question
Q.115 What is JMeter load time?

Load time usually refers to time needed to load a web page but in Apache JMeter it refers to elapsed time.

Load time or elapsed time in Apache JMeter is the total time before a request is sent and after the response is received.

Multiple threads simulate multiple connections or users, to application under test. Apache JMeter load time refers to request send by a thread and response received by the thread.

Apache JMeter load time = time after the response is received - time before a request is sent 

Report This Question
Q.116 What is test plan and workbench in JMeter?

Apache JMeter test plan stores all individual elements needed to run the test. It  has all elements and their configuration needed to execute test,  by Apache JMeter on application under test (AUT).  

A test plan has

  • Thread group having multiple threads, simulating multiple connections / users. We can configure count of threads, ramp up period (time to activate all threads) and number of time to execute the test.
  • Sampler – which send request and wait for response. Different types are as per need like HTTP/FTP/LDAP, etc
  • Logic controller  - used to control when to send request
  • Listener – gather test result and can output graph/results tree
  • Timer – used to add delay
  • Assertions – to check received response

Apache JMeter workbench is just a temporary location to store test elements during test execution. It is has no relation to test plan. Data stores in Apache JMeter workbench is not saved unless configured but, is not recommended.

Report This Question
Q.117 How popular is JMeter?

Apache JMeter is very popular performance testing tool. It is open source and has huge following amongst software testers across the globe.

Apache JMeter is used by software development companies across the globe like IBM, Capgemini, Accenture Oracle, Capgemini, TCS, etc.

Report This Question
Q.118 Is JMeter a free tool?

Yes, JMeter is open source tool and there is no cost to purchase and no trial period for downloaded software. There is no licensing cost involved with Apache JMeter download or usage.

There is no limitation on usage being enforced by Apache Foundation on JMeter.

Only cost involved for a company is of training of the professionals, on the JMeter.

Report This Question
Get industry recognized certification

Get Govt. Certified

Certified Jmeter Professional

Know More
Get Govt. Certified Take Test