# Custom jar deployment

**URL:** <https://discuss.elastic.co/t/custom-jar-deployment/306832>\
**Category:** Logstash\
**Created:** [June 9, 2022, 9:35pm UTC](https://discuss.elastic.co/t/custom-jar-deployment/306832 "2022-06-09T21:35:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![igladyshev](https://avatars.discourse-cdn.com/v4/letter/i/c57346/32.png) [@igladyshev](https://discuss.elastic.co/u/igladyshev)\
**Post date:** [June 9, 2022, 9:35pm UTC](https://discuss.elastic.co/t/custom-jar-deployment/306832/1 "2022-06-09T21:35:16Z")

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Hello. I am trying to consume kafka topics and output them to s3. All works when we consume topics published in Avro, but we are struggling to make it working for JSON topics. I understood there is an option of using specific deserialization class and set it in "value\_deserializer\_class" string property like this:

```auto
value_deserializer_class: "io.confluent.kafka.serializers.KafkaJsonDeserializer".

```

When running I get "class not found error"

How do I upload deserializer jar?

Thanks?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 7, 2022, 9:36pm UTC](https://discuss.elastic.co/t/custom-jar-deployment/306832/2 "2022-07-07T21:36:11Z")

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