[Solved] What will happen if you try to get a non-existent JMX attribute like this? ObjectName name = new ObjectName("kafka.server:type=BrokerTopicMetrics,name=MessagesInPerSec");... | Kafka

Kafka - Monitoring and Operations

What will happen if you try to get a non-existent JMX attribute like this? ObjectName name = new ObjectName("kafka.server:type=BrokerTopicMetrics,name=MessagesInPerSec"); String value = (String) mbeanServer.getAttribute(name, "NonExistentAttr"); System.out.println(value);

APrints empty string

BPrints null

CPrints "NonExistentAttr"

DThrows AttributeNotFoundException

Step-by-Step Solution

Solution:

Step 1: Understand JMX behavior on missing attribute
Requesting a non-existent attribute throws AttributeNotFoundException.
Step 2: Casting does not prevent exception
Since attribute is missing, exception occurs before casting or printing.
Final Answer:
Throws AttributeNotFoundException -> Option D
Quick Check:
Missing attribute = Exception thrown [OK]

Quick Trick: Missing JMX attribute causes exception, not null [OK]

Common Mistakes:

MISTAKES

Expecting null instead of exception
Assuming empty string output
Thinking attribute name prints

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What will happen if you try to get a non-existent JMX attribute like this?

Step 1: Understand JMX behavior on missing attribute

Step 2: Casting does not prevent exception

Final Answer:

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