ASF GitHub Bot commented on AVRO-1954:

derekstraka commented on issue #180: AVRO-1954 - Schema.Field.defaultVal() 
generates: Unknown datum type org.apache.avro.JsonProperties$Null
URL: https://github.com/apache/avro/pull/180#issuecomment-365573082
   Ah, awesome.  I was using the 1.8.0 release, and I had applied this patch to 
that tag locally and it resolved my issue.  I didn't think to check in master 
to see if it was already merged.  Thanks for your help!

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> Schema.Field.defaultVal() generates: Unknown datum type 
> org.apache.avro.JsonProperties$Null
> -------------------------------------------------------------------------------------------
>                 Key: AVRO-1954
>                 URL: https://issues.apache.org/jira/browse/AVRO-1954
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.8.1, 1.9.0
>            Reporter: rui miranda
>            Assignee: Nandor Kollar
>            Priority: Minor
>             Fix For: 1.9.0
>         Attachments: unitTestDefaultNull.patch
> I was creating GenericRecords and populating some fields -- which i could not 
> find the content on some json files -- with the Schema.Field.defaultVal(). 
> It seems if the schema has explicitly set the default value to be null, the 
> records generated this way can't be written. In this case, if default value 
> is null in the schema, an instance of 
> org.apache.avro.JsonProperties.NULL_VALUE is returned by 
> Schema.Field.defaultVal().
> I created an unit test which replicates the bug. I was thinking modify the 
> class org.apache.avro.generic.GenericData to evaluate 
> org.apache.avro.JsonProperties.NULL_VALUE as null. Is this the way to go? or 
> org.apache.avro.JsonProperties.NULL_VALUE is intend for other purposes?

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