Given this Kafka Streams snippet, what will happen if a record causes a NullPointerException inside the mapValues function?

medium📝 Predict Output Q4 of 15

Kafka - Advanced Stream Processing

stream.mapValues(value -> {
  if(value == null) throw new NullPointerException();
  return value.toUpperCase();
});

AThe record will be sent to a dead-letter topic automatically

BThe stream processing will stop with an exception

CThe record will be skipped and processing continues

DThe stream will retry processing the record indefinitely

Step-by-Step Solution

Solution:

Step 1: Analyze exception handling in mapValues
Without explicit try-catch, exceptions thrown inside mapValues stop the stream.
Step 2: Understand default Kafka Streams behavior on exceptions
Kafka Streams does not skip or retry records automatically without error handlers.
Final Answer:
The stream processing will stop with an exception -> Option B
Quick Check:
Unhandled exception = Stream stops [OK]

Quick Trick: Unhandled exceptions stop Kafka Streams processing [OK]

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