hi any body tell me is there any tool for perfomance test for API's.
i want test the my Java Mail Application
Unfortunately "performance test" is a bit too much of a general term.
At a broadstroke, I'd say find yourself a good profiling tool and run that on your application, since they can measure all kinds of performance metrics. But what do you mean? Are you interested in run time, or the memory usage, or the CPU usage, or the throughput or garbage collection, or latency or.....you get the idea. Especially as you mention its a Java Mail program you might even be referring to network performance in which case you'll need something else again.
Could you clarify what you want to learn about the performance? When you mention a "performance test for API's" do you mean you want to know how efficient the Java Mail API is in relation to other e-mailing APIs? and again in what way? If this is the case then the best thing to do is to google for some comparative studies of various libraries.
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