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It's not really that bad. And on the plus side, VisualVM helps a ton because you can connect to a running JVM and actually see what's happening with the garbage collector (among other things).

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I've seen high throughput apps doing 45 second "stop the world" garbage collection cycles because of high disk I/O and enabled GC logging (the process just sat there waiting for some I/O time to flush the GC log file).

So in theory tuning GC isn't thaaaaaat complicated. In practice however I've seen horrible things :(

Sure, I'm not saying pathological cases can't come up. Just that JVM GC tuning isn't usually that big a deal. IOW, it isn't some "black art" that only uber-wizards can comprehend..

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