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https://issues.apache.org/jira/browse/AVRO-1927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15522012#comment-15522012
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Yibing Shi commented on AVRO-1927:
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[~asmaier], currently the generated code doesn't check whether we are setting a
null value for a non nullable column. In your case, null is a valid Java String
value and thus it works. However, I believe AVRO would throw an exception when
you try to write your object. Have you tried that? Does it fail or succeed?
{code}
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
Encoder encoder = EncoderFactory.get().binaryEncoder(os, null);
SpecificDatumWriter writer = new
SpecificDatumWriter(MyObject.getClassSchema());
writer.write(myObject, encoder);
{code}
> If a default value is set, Avro allows null values in non-nullable fields.
> --
>
> Key: AVRO-1927
> URL: https://issues.apache.org/jira/browse/AVRO-1927
> Project: Avro
> Issue Type: Bug
> Components: java
>Affects Versions: 1.8.1
>Reporter: Andreas Maier
> Labels: newbie
>
> With an avro schema like
> {code}
> {
> "name": "myfield",
> "type": "string",
> "default": ""
> }
> {code}
> the following code should throw an exception
> {code}
> MyObject myObject = MyObject.newBuilder().setMyfield(null).build();
> {code}
> But instead the value of myfield is set to null, which causes an exception
> later when serializing myObject, because null is not a valid value for
> myfield.
> I believe in this case setMyfield(null) should throw an exception,
> independent of the value of default.
> See also
> https://stackoverflow.com/questions/38509279/generated-avro-builder-set-null-doesnt-overwrite-with-default
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