Given the following Kafka consumer code snippet, what will be the output if the message value is a JSON string but the deserializer is set to StringDeserializer?

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Kafka - Consumers

Given the following Kafka consumer code snippet, what will be the output if the message value is a JSON string but the deserializer is set to StringDeserializer?

props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
ConsumerRecord<String, String> record = consumer.poll(Duration.ofMillis(100)).iterator().next();
System.out.println(record.value());

ABinary data printed as garbage characters

BThe JSON string as plain text

CNull value printed

DA deserialization error exception

Step-by-Step Solution

Solution:

Step 1: Understand StringDeserializer behavior
StringDeserializer converts bytes to a UTF-8 string without parsing JSON.
Step 2: Output of printing record.value()
The JSON string is printed as plain text exactly as received.
Final Answer:
The JSON string as plain text -> Option B
Quick Check:
StringDeserializer outputs raw string [OK]

Quick Trick: StringDeserializer prints raw string, no JSON parsing [OK]

Common Mistakes:

Expecting automatic JSON parsing
Thinking deserialization fails on JSON strings
Assuming binary garbage output

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Given the following Kafka consumer code snippet, what will be the output if the message value is a JSON string but the deserializer is set to StringDeserializer?

Step 1: Understand StringDeserializer behavior

Step 2: Output of printing record.value()

Final Answer:

Quick Check:

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