jerrypeng edited a comment on issue #3741: POJO AvroSchema always allowNull
URL: https://github.com/apache/pulsar/issues/3741#issuecomment-469565479
 
 
   @sijie yup though I am not sure setting AllowNull is producing an 
incompatible schema.  Incompatible to what?  I guess if a user wrote some code:
   
   ```
   ReflectData.get().getSchema(MyClass.class)
   ```
   
   and they didn't set allow null then it wouldn't be compatible with the 
current schema generated from AvroSchema but my implementation could just have 
easily set allow null.  Thus, this doesn't seem like big deal and arbitrary.  I 
think the bigger problem here is the one with shading and how generated java 
classes are handled since that is a API/standard that should work across 
systems.

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