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https://issues.apache.org/jira/browse/FLINK-23847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17409467#comment-17409467
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camilesing commented on FLINK-23847:
------------------------------------
[~ruanhang1993] you're right. the trace like:
{code:java}
java.lang.NullPointerException: valueDeserializer
{code}
But it can be clearer:
{code:java}
java.lang.NullPointerException: valueDeserializer cannot be null
{code}
> [Kafka] Error msg are obscure when KafkaConsumer init, valueDeserializer is
> null
> --------------------------------------------------------------------------------
>
> Key: FLINK-23847
> URL: https://issues.apache.org/jira/browse/FLINK-23847
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Reporter: camilesing
> Priority: Critical
> Labels: pull-request-available
>
> As the title, i think the msg can be clearer.
>
> _this.deserializer = checkNotNull(deserializer, "valueDeserializer");_
> _->_
> _this.deserializer = checkNotNull(deserializer, "valueDeserializer cannot be
> null");_
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