Resolving the schema.registry.ssl.engine.factory.class Exception in Spring Boot Kafka Integration

Описание: Learn how to fix the `ConfigException` related to `schema.registry.ssl.engine.factory.class` in your Spring Boot Kafka application. This simple guide provides step-by-step instructions to upgrade your dependencies and avoid construction issues in your Kafka consumers.
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This video is based on the question https://stackoverflow.com/q/64595528/ asked by the user 'Vladimir Stanciu' ( https://stackoverflow.com/u/13237531/ ) and on the answer https://stackoverflow.com/a/64607840/ provided by the user 'Vladimir Stanciu' ( https://stackoverflow.com/u/13237531/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the schema.registry.ssl.engine.factory.class Exception in Spring Boot Kafka Integration

In the world of microservices and event-driven architectures, Apache Kafka has become a popular choice for messaging. However, upgrading dependencies in frameworks like Spring Boot can sometimes lead to unexpected configuration issues. One such issue is the ConfigException that arises when using Kafka with the Confluent Schema Registry. This error message often states that the class related to schema.registry.ssl.engine.factory.class could not be found, leading to frustrations for developers.

In this post, we'll explore this problem in detail and provide a solution that will enable you to get back to development without the hassle of unresolved exceptions.

Identifying the Problem

Recently, one of our projects experienced a hiccup after upgrading Spring Boot from version 2.1.x to 2.3 and Spring Kafka to 2.6.0. This seemingly minor change resulted in the following exception when trying to construct a consumer:

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The error would occur particularly when utilizing a custom KafkaAvroDeserializer along with a MockSchemaRegistryClient. The root of the issue was unclear at first, so we needed to dig a bit deeper to identify a reliable solution.

The Solution: Upgrade Dependency

After troubleshooting the configuration, it became clear that the root cause of the exception was related to the version of the kafka-avro-serializer library being used in the project.

Step-by-Step Instructions to Fix the Issue

Locate Your Dependency Management File: Check your pom.xml if you are using Maven, or build.gradle if you are using Gradle.

Update the kafka-avro-serializer Dependency: Change the version of the kafka-avro-serializer library to at least 5.5.0. Here’s how you'd do it in both build systems:

For Maven:

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For Gradle:

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Rebuild Your Application: After updating the dependency, rebuild your application to ensure that the new library version is downloaded and applied.

Run Your Tests: Execute your integration tests to confirm that the exception no longer occurs and that everything functions as expected.

Conclusion

By updating the kafka-avro-serializer library to version 5.5.0, you should be able to resolve the schema.registry.ssl.engine.factory.class exception within your Spring Boot Kafka application. Upgrading dependencies can sometimes introduce new challenges, but with the right adjustments, you can smoothly navigate through them.

If you encounter similar issues in the future, remember that version compatibility is key! Always check the documentation for the dependencies you are using, especially after major framework upgrades.

Happy coding!