Can you recommend a simple/best tool for an web application developed using Wicket framework?
The challenge is interface id is changed every time so record and playback may not work. This link explains some work around but it is not simple to implement.
Besides JMeter you can try Selenium to test web applications. If you use Selenium you show also check Selenium Inspector which is build on top of it and provides convenient assertion methods.
Online service BrowserMob offers cloud based load testing based on selenium.