Load Testing Tools

• YouKit :  seems like YouKit handsdown beat JProfiler. It's low overhead, stable, easy to install on the JVM to be profiled (just one dll) and powerful.
• JProfiler
• for JDK >=1.6, jvisualvm comes bundled. 

             For "general purpose" profiling, jvisualvm is great. no extra building or setup or anything, just attach        and go. once you find something, you might need to go to one of these other apps to get real in depth coverage, though.

• JProbe
• JMeter