What will happen if you try to access a key that does not exist in a Kafka Streams key-value state store?

medium📝 Predict Output Q5 of 15

Kafka - Advanced Stream Processing

AIt returns zero

BIt throws a NullPointerException

CIt creates a new entry with default value

DIt returns null

Step-by-Step Solution

Solution:

Step 1: Understand state store get behavior
When a key is missing, the get method returns null, not an exception or default value.
Step 2: Confirm no automatic entry creation
State stores do not create entries automatically on get calls.
Final Answer:
It returns null -> Option D
Quick Check:
Missing key returns null [OK]

Quick Trick: Missing keys return null, not exceptions [OK]

Common Mistakes:

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