shibd commented on issue #21069:
URL: https://github.com/apache/pulsar/issues/21069#issuecomment-1696683423
I see. The root cause is you used this lib to deserialize the config map:
```
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-kotlin</artifactId>
<version>${jackson.version}</version>
</dependency>
```
In pulsar io connector framework, we use
[NarClassLoader](https://github.com/apache/pulsar/blob/82237d3684fe506bcb6426b3b23f413422e6e4fb/pulsar-common/src/main/java/org/apache/pulsar/common/nar/NarClassLoader.java#L127)
to load classes in the `nar` package. We set it in the context of the thread.
Perhaps because `jackson-module-kotlin` uses other classLoaders internally.
I updated my repo. You can refer to it:
https://github.com/shibd/kotlin-io-example/commit/46f4cf6325afa0ea9587ae8d6abe59d863048397
BTW: It is recommended to use IOConfigUtils to deserialize the config map,
which will be checked and applied config by `@FieldDoc `.
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