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A volatile field guarantees that a write is visible to other threads, but it does not make a compound operation atomic. synchronized locks a monitor and protects a block of code so only one thread executes it at a time. In practice, use volatile for state flags and synchronized for critical sections that need atomicity and ordering guarantees.

Find the first operation that received None and trace the producer branch, database field, or external payload that supplied it. Decide whether absence is valid: represent it as Optional and handle it explicitly, or reject malformed input at the boundary. Blindly substituting an empty string or zero can hide an invalid state and change business meaning.

High allocation can cause frequent collections while post-GC occupancy remains broadly stable. A leak tends to retain objects that should have become unreachable, so compare heap dumps and dominator paths across time. Check allocation rate, live set, GC logs, and process/container memory together before changing heap settings.