serialization-deserialization problem

[C 4.5]

Hi All,

I have defined a simple Avro schema for Customer objects. Schema compiles
OK and don't have any problem.

I am trying to serialize to json string and deserialize into Customer java
objects but I am not able to.

Please see below:
[1]: is the full code snippet
[2]: is the output I obtain

I am using Avro 1.7.7

Customer's schema is flows. Emails are optional.
{"namespace": "...",
 "type": "record",
 "name": "Customer",
 "fields": [
     {"name": "emails",       "type": [ "null", "....CustomerEmails"]},
     {"name": "transactions", "type": [ "null", "...CustomerTransactions"]},
     {"name": "features", "type": [ "null", "...CustomerFeatures"]}
 ]
}

I have researched and tried different things but something seems to escape
me, this should be a very trivial case to support.
Hence, I am sure I am just overlooking something that is probably obvious.

Any feedback?
Thanks a ton

===[1] code
           // ser
           List<CharSequence> emails = new ArrayList<CharSequence>();
            emails.add("a...@a.com");
            emails.add("b...@b.com");

            CustomerEmails customerEmails = CustomerEmails.newBuilder().
                    setEmails(emails).
                    build();

            Customer customer = Customer.newBuilder().
                    setEmails(customerEmails).
                    setTransactions(null).
                    setFeatures(null).
                    build();

            String customerJson = customer.toString();
            System.out.println("customer json: " + customerJson);

            // de-ser
            JsonDecoder jsonDecoder =
DecoderFactory.get().jsonDecoder(Customer.getClassSchema(), customerJson);
            SpecificDatumReader<Customer> reader = new
SpecificDatumReader<Customer>(Customer.class);
            Object obj = reader.read(null, jsonDecoder);

            System.out.println("obj=" + obj);

===[2] output
customer json: {"emails": {"emails": ["a...@a.com", "b...@b.com"]},
"transactions": null, "features": null}
Exception in thread "main" org.apache.avro.AvroTypeException: Unknown union
branch emails
    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.read(GenericDatumReader.java:155)
    at
org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:193)
    at
org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:183)
    at
org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:151)
    at
org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
    at com.mytest.Deser.main(Deser.java:79)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)