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https://issues.apache.org/jira/browse/KAFKA-7052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17033473#comment-17033473
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Robin Moffatt commented on KAFKA-7052:
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I agree that even just improving the error message would be a good first-step
here.
> ExtractField SMT throws NPE - needs clearer error message
> ---------------------------------------------------------
>
> Key: KAFKA-7052
> URL: https://issues.apache.org/jira/browse/KAFKA-7052
> Project: Kafka
> Issue Type: Improvement
> Components: KafkaConnect
> Reporter: Robin Moffatt
> Priority: Major
>
> With the following Single Message Transform:
> {code:java}
> "transforms.ExtractId.type":"org.apache.kafka.connect.transforms.ExtractField$Key",
> "transforms.ExtractId.field":"id"{code}
> Kafka Connect errors with :
> {code:java}
> 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){code}
> There should be a better error message here, identifying the reason for the
> NPE.
> Version: Confluent Platform 4.1.1
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