apache/jmeter ? reverse-engineered prompt

Build me a simple but usable load testing app in Java that lets me create and run test plans for websites and APIs.

I want a desktop interface where I can add requests, set how many users to simulate, choose how long the test should run, and then start, stop, and review the results. It should also work from the command line so I can run tests without opening the UI. Please include basic reporting with charts and a clean HTML results page I can share after a test.

Support common targets like HTTP and HTTPS, and make it easy to add more later. I’d also like a way to record requests from browsing a site, save and open test plans, and inspect failures or slow responses. If you need to, look up current docs online for any Java or Gradle details, but keep the app straightforward and practical rather than overengineered.