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> In my experience, running JVM in production with tools like JProfiler/VisualVM/jconsole, etc. does not come close to the BEAM when trying to understand what is happening in the system.

Then you haven't tried Java Flight Recorder/Mission Control or the new javosize. BEAM doesn't come close... :)

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I hadn't heard of javosize before, looks interesting, thanks. Being able to update code and data on a live system is very useful and I haven't seen that for the JVM before (BEAM of course handles that :) ).

Well, there are a lot of JVM tools to inject code into a running application. Take a look at Byteman (which is much more mature than javosize, but mostly targets injecting traces for live debugging purposes)

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