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https://issues.apache.org/jira/browse/CAMEL-12453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16443315#comment-16443315
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Andreas Mattes commented on CAMEL-12453:
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I've been checking with further route samples, and I've seen that custom
serializer/deserializer classes are normally resolved in the KafkaEndpoint
using the class resolver of the Camel context. This has been working well in my
latest samples; and I am going to revisit the problematic routes. I will come
back if I find any issue which should be resolved in Camel, otherwise the
present issue can be closed.
> Custem serializers referenced in a Camel Kafka endpoint URL cannot be
> resolved in OSGi
> --------------------------------------------------------------------------------------
>
> Key: CAMEL-12453
> URL: https://issues.apache.org/jira/browse/CAMEL-12453
> Project: Camel
> Issue Type: Bug
> Components: camel-kafka
> Affects Versions: 2.21.0
> Reporter: Andreas Mattes
> Priority: Major
> Attachments: Kafka-serializer-classloading-src.tar.gz,
> Kafka-serializer-classloading-test.tar.gz
>
>
> In Camel Kafka endpoint URLs, serializer and deserializer classes can be set
> as parameters. These are set as Strings (class names) and resolved to classes
> in the scope of the Kafka client. In environments with restrictive class
> loading like OSGi, camel-karaf ensures that Kafka classes can be resolved
> properly by setting the context class loader to the class loader of the Kafka
> client classes. However, this setting makes it impossible to reference custom
> serializers in the Kafka endpoint URL, because these cannot be resolved by
> the Kafka class loader and let Kafka producer and/or consumer creation fail
> with a ClassNotFoundException.
> The attached file "Kafka-serializer-classloading-test.tar.gz" contains a test
> derived from a camel-kafka unit test which demonstrates the serializer class
> loading issue.
> The attached file "Kafka-serializer-classloading-src.tar.gz" contains class
> sources of a proposal for a fix of this issue.
> The content of both files is derived from Camel 2.21.0.
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