Problemunvalidated

java.lang.IllegalStateException: Duplicate key a (attempted merging values 1 and 1) — I'm trying to convert a list of objects to a `Map` using Java Streams. Tension: I expected it to just create a map with unique keys, but I forgot that my list has duplicates.

fa451d4d-d3ae-4c19-ba28-aed5df8bd037

java.lang.IllegalStateException: Duplicate key a (attempted merging values 1 and 1) — I'm trying to convert a list of objects to a Map using Java Streams. Tension: I expected it to just create a map with unique keys, but I forgot that my list has duplicates.