[KAFKA-7052] ExtractField SMT throws NPE - needs clearer error message

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.2.3, 2.5.0, 2.3.2, 2.4.1
• Component/s: connect
• Assignee: Unassigned
• Reporter: Robin Moffatt
• Reviewer: Randall Hauch
• Created: 13/Jun/18 08:26
• Updated: 11/Feb/20 20:20
• Resolved: 11/Feb/20 20:20

Description

With the following Single Message Transform: 

"transforms.ExtractId.type":"org.apache.kafka.connect.transforms.ExtractField$Key",
"transforms.ExtractId.field":"id"

Kafka Connect errors with : 

java.lang.NullPointerException
at org.apache.kafka.connect.transforms.ExtractField.apply(ExtractField.java:61)
at org.apache.kafka.connect.runtime.TransformationChain.apply(TransformationChain.java:38)

There should be a better error message here, identifying the reason for the NPE.

Version: Confluent Platform 4.1.1

Issue Links

• is related to: KAFKA-8523 InsertField transformation fails when encountering tombstone event
• links to: GitHub Pull Request #8059