What level to use for exception stack trace logging in Java?

Stack trace is the most valuable piece of information you get when troubleshooting. I would never risk logging it on DEBUG level since it might be disabled. And I almost never want to suppress stack traces.

I'm not sure about best-practice advice for this, but in the end, for me it boils down to this: Exceptions should only be visible in exceptional circumstances. The concept of exception was invented to give developers a chance to handle errors internally.

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