Karaf - Kafka OSGI bundle - Producer issue

Question

I am trying to create a simple bundle for Kafka producer in apache Karaf version 4.0.3 .

Here is my Java code

Answer 1

using Kafka client version 0.8.2.2_1, solved the issue .

Answer 2

I saw this same problem in 0.9.0. It turned out that a Thread context loader was set, and in that case Kafka uses that classloader to resolve. So the thread context classloader should either be:

• A classloader that can resolve all the Kafka related stuff
• null

Don't know if this is going to bite me, but adding:

Thread.currentThread().setContextClassLoader(null);

did the trick.

Answer 3

Might me useful for others, work around suggested in JIRA

props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, org.apache.kafka.common.serialization.StringSerializer.class);

props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, org.apache.kafka.common.serialization.StringSerializer.class);