lhotari commented on PR #19160:
URL: https://github.com/apache/pulsar/pull/19160#issuecomment-1378862088

   > @lhotari I see the improvement here, a couple of comments:
   > 
   > * wouldn't be better to only expose the read/write method + 
`unsafeGetInstance` ? My concern is that you could call 
`ObjectMapperFactory.getInstance().setDateFormat(xx)` changing the internal 
configuration
   
   You are right. I assume you mean returning an ObjectReader/ObjectWriter 
(which are immutable) instead of returning a ObjectMapper at all. It would be a 
better approach.
   One detail is that the current threadlocal solution is already "unsafe".
   
   > * `ObjectMapperFactory` naming should matches the singleton pattern
   
   There's a need to have different type of ObjectMapper instances already. I 
noticed that replacing `new ObjectMapper()` with the shared instance broke 
things since the serialization config if different (`Include.ALWAYS` is the 
default, but the configured one has `Include.NON_NULL`). Therefore the name 
`ObjectMapperFactory` could be justified although it's not an actual Factory. 
   What name would you suggest?
   
   
   
   


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