avro runtime exception not a map when return in Json format -


i have avro schema ukrecord, contain list of cmrecord(also avro schemaed):

{     "namespace": "com.uhdyi.hi.avro",     "type": "record",     "name": "ukrecord",     "fields": [         {             "name": "coupon",             "type": [                 "null",                 "string"             ],             "default": null         },         {             "name": "cm",             "type": [                 "null",                 {                     "type": "array",                     "items": {                         "type": "record",                         "name": "cmrecord",                         "fields": [                             {                                 "name": "id",                                 "type": "string",                                 "default": ""                             },                             {                                 "name": "name",                                 "type": "string",                                 "default": ""                             }                         ]                     }                 }             ],             "default": null         }     ] }

in java code, create ukrecord has fields populated correctly, need return object using json based api, complained: 

org.apache.avro.avroruntimeexception: not map: {"type":"record","name":"cmrecord","namespace":"com.uhdyi.hi.avro","fields":[{"name":"id","type":"string","default":""},{"name":"name","type":"string","default":""}]}

the java code write object json :

objectwriter writer = objectmapper.writer(); if (obj != null) {    response.setheader(httpheaders.names.content_type, "application/json; charset=utf-8");    byte[] bytes = writer.writevalueasbytes(obj);  <-- failed here         ... }

obj is:

{"coupon": "c12345", "cm": [{"id": "1", "name": "name1"}, {"id": "2", "name": "name2"}]}

why error? please help!

because using unions, avro uncertain how interpret json providing. here's how can change json avro knows it's not null

{   "coupon": { "string": "c12345" },   "cm": { "array": [           { "id": "1", "name": "name1" },           { "id": "2", "name": "name2" }         ]   } }

i know, it's annoying how avro chose handle nulls.


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