Avro serialize and desiaralize List<UUID> - encoding

Question

I cannot understand how to serialize List to binary format and deserialize back to List. I have tried to use CustomEncoding for this purpose:
public class ListUUIDAsListStringEncoding extends CustomEncoding<List<UUID>> {
{
schema = Schema.createArray(Schema.createUnion(Schema.create(Schema.Type.STRING)));
schema.addProp("CustomEncoding", "com.my.lib.common.schemaregistry.encoding.ListUUIDAsListStringEncoding");
}
#Override
protected void write(Object datum, Encoder out) throws IOException {
var list = (List<UUID>) datum;
out.writeArrayStart();
out.setItemCount(list.size());
for (Object r : list) {
if (r instanceof UUID) {
out.startItem();
out.writeString(r.toString());
}
}
out.writeArrayEnd();
}
#Override
protected List<UUID> read(Object reuse, Decoder in) throws IOException {
var newArray = new ArrayList<UUID>();
for (long i = in.readArrayStart(); i != 0; i = in.arrayNext()) {
for (int j = 0; j < i; j++) {
newArray.add(UUID.fromString(in.readString()));
}
}
return newArray;
}
}
'write' method seems to pass correctly, but 'read' method stoped with exception 'java.lang.ArrayIndexOutOfBoundsException: 36' when trying to read string.
What I do wrong and how to deserialize data correctly?

Answer 1

Solved myself:
Put my encoding class here if someone will need it:
public class ListUuidAsNullableListStringEncoding extends CustomEncoding<List<UUID>> {
{
schema = Schema.createUnion(
Schema.create(Schema.Type.NULL),
Schema.createArray(Schema.create(Schema.Type.STRING))
);
}
#Override
protected void write(Object datum, Encoder out) throws IOException {
if (datum == null) {
out.writeIndex(0);
out.writeNull();
} else {
out.writeIndex(1);
out.writeArrayStart();
out.setItemCount(((List) datum).size());
for (Object item : (List) datum) {
if (item instanceof UUID) {
out.startItem();
out.writeString(item.toString());
}
}
out.writeArrayEnd();
}
}
#Override
protected List<UUID> read(Object reuse, Decoder in) throws IOException {
switch (in.readIndex()) {
case 1:
var newArray = new ArrayList<UUID>();
for (long i = in.readArrayStart(); i != 0; i = in.arrayNext()) {
for (int j = 0; j < i; j++) {
newArray.add(UUID.fromString(in.readString()));
}
}
return newArray;
default:
in.readNull();
return null;
}
}
}