[AVRO-2107] Unable to deserialize JSON with array type to GenericRecord

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 1.8.1, 1.8.2
• Assignee: Unassigned
• Reporter: Darshan Mehta
• Created: 23/Nov/17 11:25
• Updated: 07/Dec/17 15:25
• Resolved: 07/Dec/17 15:25

Description

I am trying to deserialise the json with array type into GenericRecord and I get the following exception:

Exception in thread "main" org.apache.avro.AvroTypeException: Unknown union branch sampleArrayRecordString
	at org.apache.avro.io.JsonDecoder.readIndex(JsonDecoder.java:445)
	at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:290)
	at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
	at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:267)
	at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:179)
	at org.apache.avro.generic.GenericDatumReader.readArray(GenericDatumReader.java:266)
	at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:177)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
	at org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:232)
	at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:222)
	at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:175)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
	at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:179)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
	at org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:232)
	at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:222)
	at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:175)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:145)
	at a.b.c.d.Test2.main(Test2.java:19)

Below is the code:

final Schema schema = Schema.parse(new File(
		"<schema_file_path>"));
byte[] payload = Files.readAllBytes(Paths.get(
		"<json_file_path>"));

GenericRecord record = new GenericDatumReader<GenericRecord>(schema).read(null,
		DecoderFactory.get().jsonDecoder(schema, new String(payload)));

System.out.println(record);