Andreas Mattes created CAMEL-12453:
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             Summary: Custem serializers referenced in a Camel Kafka endpoint 
URL cannot be resolved
                 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
         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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