Strict parsing of GenericRecord JSON

["Parameswaran,Sudeep" <Su...@Cerner.com>]

Hello,

I have a use case to read a GenericRecord from its JSON Avro representation with strict validations.  For example, with an Avro schema of two fields 'id' and 'name', if the JSON has an undefined field, say 'age', I need to raise a validation exception.

Could you please recommend a way to achieve this with Avro API?

Following is a test case for the requirement.
  @Test(expected = IOException.class)
  public void validateUndefinedFields() throws Exception {
    Schema schema = new Schema.Parser().parse(
        "{\"type\": \"record\","
            + "\"name\": \"Test\","
            + "\"namespace\": \"com.example\","
            + "\"fields\": [{\"name\":\"id\",\"type\":\"string\"},{\"name\":\"name\",\"type\":\"string\"}]}");

    DatumReader<GenericRecord> datumReader = new GenericDatumReader<>(schema);

    String json = "{\"id\":\"1\", \"age\":27, \"name\":\"abc\"}"; // 'age' is undefined in the schema

    DecoderFactory decoderFactory = DecoderFactory.get();
    Decoder jsonDecoder = decoderFactory.jsonDecoder(schema, json);

    // This currently does not fail validations.
    // TODO: How to validate there are no undefined fields in the input JSON?
    datumReader.read(null, jsonDecoder);
  }


Thank you.


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