GitHub user shan-96 added a comment to the discussion: JSONSchema should works 
with generic (parameterized type) POJO/DTO.

> @vamsi360 ,
> I cloned your fork and built it to version 1.8.3-ppe-9.10.
> I still get the errror.
> Caused by: org.apache.avro.AvroTypeException: Unknown type: T
>       at 
> org.apache.avro.specific.SpecificData.createSchema(SpecificData.java:312)
>       at 
> org.apache.avro.reflect.ReflectData.createSchema(ReflectData.java:720)
>       at 
> org.apache.avro.reflect.ReflectData.createFieldSchema(ReflectData.java:870)
>       at 
> org.apache.avro.reflect.ReflectData.createSchema(ReflectData.java:686)
>       at org.apache.avro.specific.SpecificData$2.load(SpecificData.java:238)
>       at org.apache.avro.specific.SpecificData$2.load(SpecificData.java:235)
>       at 
> avro.shaded.com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3568)
>       at 
> avro.shaded.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2350)
>       at 
> avro.shaded.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2313)
>       at 
> avro.shaded.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2228)
>       ... 6 more


I am facing the same problem. It seems we are creating the build in a wrong way

GitHub link: 
https://github.com/apache/pulsar/discussions/18849#discussioncomment-4352451

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