TheNeuralBit commented on pull request #13622:
URL: https://github.com/apache/beam/pull/13622#issuecomment-752146612


   Ah thanks for the investigation. When looking into BEAM-10632 I learned that 
the Java spec requires the runtime to ignore an annotation whose type isn't on 
the classpath:
   
   > When an annotation is put on a member but the annotation type is missing 
on the class path, the specification requires the runtime to ignore this 
annotation, i.e. to act as if the annotation is not present.
   
   Is it possible `org.apache.avro.reflect.Nullable` isn't on the classpath?


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