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How to avoid ConcurrentModificationException in concurrent code when iterating Map's values? Any safe API for this?

Does `toTypedArray()` throw if collection is mutated during the call?

No, because the array is not affected by further edits of the map.

Yeah but does `toTypedArray()` iterates over the collection in a way that could be affected by modification of the collection/map?

could you use a `ConcurrentHashMap` instead?

If you are modifying on another thread, you would still risk this, and you need to use what Brian suggested (`ConcurrentHashMap`).

With multiple threads it would be smart to synchronize work. When iterating over map, store keys which need to be removed in a list and do that after iteration. That how you prevent modification while iterating.