Tomer Gendron

Table of Contents:

By using Apache JMeter™, you can simulate AJP requests with a sampler that can send these requests and gets responses - the AJP/1.3 Sampler. You can also use this JMeter sampler to load test the WildFly, Jetty and GlassFish servlet containers, which also use AJP. This blog post will teach you how to load test Tomcat.

Requests are processed roughly in the following way:

Here is a basic diagram of connections between the Client, front-end Apache Web Server and Tomcat Application Servers:

For architectures like this, the JMeter AJP/1.3 Sampler enables testing each AJP connection in your system, by sending AJP requests to any application server, and finding bottlenecks.

There are three versions of an AJP - 1.2 (deprecated), 1.3 and 1.4 (experimental). JMeter’s AJP/1.3 Sampler supports the 1.3 version.

Now let’s learn how to use it.

The AJP/1.3 Sampler translates the HTTP request set in this component to an AJP request. As you can see, it has a similar GUI to the HTTP Sampler.

There is only one limitation for the AJP Sampler - the current implementation doesn’t support uploading multiple files in one request. Only the first file will be uploaded. You can use multiple AJP Samplers to upload multiple files.

Now let’s see how the AJP Sampler works in a JMeter script. First, we’ll launch a Tomcat instance on our local machine and configure it to send POST Requests. A Tomcat9 distribution come with some servlet examples, that can be used to check AJP requests.

Our testing scenario is:

1. To launch a Tomcat instance on your server, you have to have a Java Runtime Environment installed and configured (JRE_HOME environment variable set). You also need to set the CATALINA_HOME environment variable to a root folder of downloaded Tomcat, and add a %CATALINA_HOME%\bin value to the list of PATH environment variables.

2. After all the preparations are done, execute a “catalina run” command in the command line. Your Tomcat web-interface can now be accessed by localhost:8080 URL.

3. You can check the example apps through the the “Examples” link under “Developer Quick Start”:

4. Let’s test the servlet example “Request Parameters”:

5. In this example we can execute a POST request to set “firstname” and “lastname” fields.

6. Let’s manually enter some values and see the response.

7. Press the ‘Submit’ button.

The entered values are assigned to the “firstname” and “lastname” fields.

Now, we will try to reproduce this request by using the AJP Sampler.

In the previous section we saw that this servlet accepts two parameters and then returns them in the response. Now let’s use the AJP Sampler to send the AJP POST request with some parameters to our server via JMeter and check that we get the same parameters in the response.

1. Open JMeter and add a Thread Group to your Test Plan.

Right Click->Add->Threads (Users)->Thread Group

2. Add an AJP Sampler to your Thread Group.

Right Click->Add->Sampler->AJP/1.3 Sampler

3. Configure the AJP Sampler exactly as you would configure an HTTP Sampler.

Our finished sampler will look like this:

4. Add a View Results Tree Listener.

Right Click->Add->Listener->View Results Tree

5. Now we can execute our script and see the results in the listener.

Here we can see our sampler successfully sent the AJP request to our server with the specified parameters. We see that our parameters are listed under “Parameters in this request” section - this means our server successfully got our request.

Congratulations! You now know how to load test AJP and Tomcat servers. To run your test in an even easier manner, upload your script to BlazeMeter and run it smoothly in the cloud. You will get scalability, collaboration options and advanced reporting.

START TESTING NOW

Car refills $225, one day only; Fragrance mists $595, one day only; Aromatherapy, Buy 2, Get 2 Free, one day only; Single wick candles $650,

Plan G will typically have higher premiums than Plan N because it includes more coverage But it could save you money because out-of-pocket costs with Plan N may equal or exceed the premium difference with Plan G, depending on your specific medical needs Costs of Medigap policies vary by state and carrier

Definition of stand surety : to agree to be legally responsible if another person fails to pay a debt or to perform a duty She will stand surety for him

Ancient Egypt was one of the world's first civilizations, with its beginnings in the fertile Nile valley around 3150 BC Ancient Egypt reached the zenith of its power during the New Kingdom ( 1570–1070 BC ) under great pharaohs

Source: www.worldhistory.org

1. Bitcoin (BTC)
2. Ethereum (ETH)
3. Solana (SOL)
4. Avalanche (AVAX)
5. Yearnfinance (YFI)
6. Polygon (MATIC)
7. Dogecoin (DOGE)