Sharath Avadoot Gururaj created AVRO-2890:
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Summary: java JSON decoder does not respect default values for
fields
Key: AVRO-2890
URL: https://issues.apache.org/jira/browse/AVRO-2890
Project: Apache Avro
Issue Type: Bug
Components: java
Affects Versions: 1.10.0
Reporter: Sharath Avadoot Gururaj
Consider the following schema:
{code:java}
{"namespace": "example.avro", "type": "record", "name": "Nic", "fields": [
{"name" : "ip", "type" : "string", "default" : ""} ] }
{code}
and the following empty json
{code:java}
{}{code}
I expect that parsing is successful with this code
{code:java}
public void jsonToAvro() throws Exception { JsonParser parser; Schema schema =
new Schema.Parser().parse(readClasspathFile(s.schema)); Decoder decoder;
JsonFactory factory = new JsonFactory(); if(s.linesep) { parser =
factory.createParser(Files.newInputStream(Paths.get(s.input))); decoder =
DecoderFactory.get().jsonDecoder(schema,
Files.newInputStream(Paths.get(s.input))); } else { parser =
factory.createParser(Files.readAllBytes(Paths.get(s.input))); decoder =
DecoderFactory.get().jsonDecoder(schema, new
String(Files.readAllBytes(Paths.get(s.input)))); }
parser.configure(JsonParser.Feature.INCLUDE_SOURCE_IN_LOCATION, true); //
Decoder decoder = new ExtendedJsonDecoder(schema, parser, true );
DataFileWriter<GenericRecord> writer; CountingOutputStream output = new
CountingOutputStream(Files.newOutputStream(Paths.get(s.output)));
DatumReader<GenericRecord> reader = new GenericDatumReader<>(schema); writer =
new DataFileWriter<>(new GenericDatumWriter<>()); writer.create(schema,
output); // Decoder decoder = new ExtendedJsonDecoder(schema, parser, true );
GenericRecord datum = null; while (true) { try { datum = reader.read(datum,
decoder); } catch (EOFException eofe) { break; } writer.append(datum); }
writer.flush(); }
{code}
But I get the following error
{noformat}
org.apache.avro.AvroTypeException: Expected field name not found: ip at
org.apache.avro.io.JsonDecoder.doAction(JsonDecoder.java:473)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.io.parsing.Parser.advance(Parser.java:86)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.io.JsonDecoder.advance(JsonDecoder.java:132)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.io.JsonDecoder.readString(JsonDecoder.java:212)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.io.JsonDecoder.readString(JsonDecoder.java:207)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.io.ResolvingDecoder.readString(ResolvingDecoder.java:208)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:469)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:459)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:191)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:160)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:259)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:247)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:179)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:160)
~[avro-1.10.0.jar:1.10.0] at
org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
~[avro-1.10.0.jar:1.10.0] at sha.Deser.jsonToAvro(Deser.java:101) ~[classes/:?]
at sha.Deser.go(Deser.java:70) ~[classes/:?] at sha.Deser.main(Deser.java:43)
[classes/:?]
{noformat}
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