Java profiling - how can I get a method by method analysis of my application?

Question

I want to run my Java app and for a given workload be able to see:

• how many times a given function was called
• how expensive each function call is in

Answer 1

If you are willing to spend a little money,

JProfiler: http://www.ej-technologies.com/products/jprofiler/overview.html

is very good, it shows you % of time used, absolute time used, and # of invocations down to the method level. It understands EJB calls, web service calls, and will even show the SQL of jdbc calls. I use it frequently to find performance issues.

It has memory profiling too, but I find the cpu profiling much more useful.