---
title: "Discussion on \"org.apache.kafka.common.config.ConfigException: Please specify a key serde or set one through StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG\" | Hashnode"
description: "Discussion on \"org.apache.kafka.common.config.ConfigException: Please specify a key serde or set one through StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG\". Kafka Streams application error"
url: "https://hashnode.com/posts/orgapachekafkacommonconfigconfigexception-please-specify-a-key-serde-or-set-one-through-streamsconfigdefaultkeyserdeclassconfig/627d381bb7c3c8c346150520"
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# [org.apache.kafka.common.config.ConfigException: Please specify a key serde or set one through StreamsConfig#DEFAULT\_KEY\_SERDE\_CLASS\_CONFIG](https://blog.adafycheng.dev/orgapachekafkacommonconfigconfigexception-please-specify-a-key-serde-or-set-one-through-streamsconfigdefaultkeyserdeclassconfig?utm_source=hashnode&utm_medium=feed)

Kafka Streams application error

May 12, 2022 · 1 min read · blog.adafycheng.dev  
Updated Jun 3, 2022  
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-   [#kafka](https://hashnode.com/tag/kafka)

## Written by

[Ada Cheng](https://hashnode.com/@adafycheng)

@adafycheng · Manchester, United Kingdom

  
[View profile](https://hashnode.com/@adafycheng)

Software Developer

I am a Software Developer, mainly involved in Software Development of JAVA-enabled web applications.

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