On the subject of memory management, developers should be aware of how the garbage collector works under the hood, because it affects the design of the code. Not having to care about freeing memory doesn't mean you don't have to care about memory management at all ;-)
I've seen many projects having poor performance because of memory leaks, leading to garbage collector running constantly and even the server crashing because the GC couldn't free enough memory (if I remember well, this occurs when GC is running 98% of the time to free less than 2% of the heap).
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