We Keep Coding

Mapping JSON response to different types

I'm using Spring 2.6 and we make a GET request via
restTemplate.exchange(url, HttpMethod.GET, httpEntity, ResponseType.class).getBody();
The JSON response can be of two kinds:
1st:
public class ResponseType {
private String data;
}
2nd:
public class ResponseType {
private Subclass data;
}
public class Subclass {
private String classId;
private String detail;
}
In the first version I only get a reference link to the subclass resource.
If the URL contains a 'resolve' flag, than the reference link get expanded already in the first request.
The classId then also specifies what kind of class it is ( 'a.b.c' or 'x.y.z' )
No problem for JSON, but how can I get a mapping in Java?
When having more fields being dynamic (link or instance based on classId) a manual way would be difficult to implement if the combination could be 2 links and 3 objects.
It also could be that a object has the same feature - a filed with a link or a instance of a class specified by classId.
The JSON response would be this:
{
"data": "abskasdkjhkjsahfkajdf-linkToResource"
}
or this:
{
"data": {
"classId": "a.b.subclass",
"detail": "some data"
}
}
or this:
{
"data": {
"classId": "a.b.subclass",
"detail": "some data"
"data2": "some-link-id",
"data3": {
"detailB": "foo",
"detailC": "some-link-id"
}
}
}

Here I do have a possible solution for my problem. The logic to print the address only or the POJO relies soley in the CustomItemSerializer. So it is possible to use this without using duplicate code in controllers.
package com.allianz.clana.datamodel.http.epc.test;
import java.io.IOException;
import java.text.ParseException;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import lombok.Data;
import lombok.NoArgsConstructor;
public class JacksonTester2 {
public static void main(String args[]) throws ParseException, JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
Item item2 = new Item("link");
Stuff stuff = new Stuff();
stuff.setItem(item2);
stuff.setFoo("foo");
String jsonStringStuff = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(stuff);
System.out.println(jsonStringStuff);
Item item3 = new Item("{ \"name\":\"ID3\", \"creationDate\":\"1984-12-30\", \"rollNo\": 1 }");
stuff.setItem(item3);
stuff.setFoo("bar");
jsonStringStuff = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(stuff);
System.out.println(jsonStringStuff);
}
}
class CustomItemSerializer extends StdSerializer<Item> {
private static final long serialVersionUID = 1L;
public CustomItemSerializer() {
this(null);
}
public CustomItemSerializer(Class<Item> t) {
super(t);
}
#Override
public void serialize(Item item, JsonGenerator generator, SerializerProvider arg2) throws IOException {
if (item != null) {
if (item.getItem() != null) {
System.out.println("ItemA POJO data");
generator.writePOJO(item.getItem());
} else {
System.out.println("raw data with link");
generator.writeString(item.getRawdata());
}
}
}
}
#Data
class Stuff {
Item item;
String foo;
}
#JsonSerialize(using = CustomItemSerializer.class)
#Data
#NoArgsConstructor
class Item {
private String rawdata;
#JsonIgnore
private ItemA item;
public Item(String rawdata) {
this.rawdata = rawdata;
if (rawdata.contains("{")) {
try {
this.item = new ObjectMapper().readerFor(ItemA.class).readValue(rawdata);
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (JsonProcessingException e) {
e.printStackTrace();
}
}
}
}
#Data
#NoArgsConstructor
class ItemA{
private String name;
private int rollNo;
private String creationDate;
public ItemA(String name, int rollNo, String dob) {
this.name = name;
this.rollNo = rollNo;
this.creationDate = dob;
}
}
The output looks like this:
raw data with link
{
"item" : "link",
"foo" : "foo"
}
ItemA POJO data
{
"item" : {
"name" : "ID3",
"rollNo" : 1,
"creationDate" : "1984-12-30"
},
"foo" : "bar"
}
The CustomItemSerializer decides if the link is printed or the POJO.

Jackson ObjectMapper Not Reading Inner Objects

I have a JSON file
{
"readServiceAuthorizationResponse": {
"serviceAuthorization": {
"serviceAuthorizationId": "50043~220106065198",
"status": "Approved",
"receivedDate": "2022-1-6 1:21:12 PM",
"providerFirstName": "Ranga",
"providerLastName": "Thalluri",
"organizationName": "General Hospital",
"serviceLines": [{
"statusReason": "Approved",
"procedureDescription": "Room & board ward general classification",
"requestedQuantity": "1.00",
"approvedQuantity": "1.00",
"deniedQuantity": "",
"quantityUnitOfMeasure": "Day(s)",
"providers": [{
"providerFirstName": "Ranga",
"providerLastName": "Thalluri",
"organizationName": ""
}]
}]
}
}
}
My Java to read this into an object is this:
package com.shawn.dto;
import java.nio.file.Files;
import java.nio.file.Paths;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.databind.ObjectMapper;
#JsonIgnoreProperties(ignoreUnknown = true)
public class ServiceAuthorizationDTO {
public String serviceAuthorizationId;
public String status;
public String receivedDate;
public String providerFirstName;
public String providerLastName;
public String organizationName;
public ServiceLine[] serviceLines;
public static ServiceAuthorizationDTO create(String json) {
ObjectMapper m = new ObjectMapper();
try {
Outer outer = m.readValue(json, Outer.class);
return outer.readServiceAuthorizationResponse.serviceAuthorization;
} catch (Exception e) {
return null;
}
}
#JsonIgnoreProperties(ignoreUnknown = true)
static class ReadServiceAuthorizationResponse {
public ServiceAuthorizationDTO serviceAuthorization;
}
#JsonIgnoreProperties(ignoreUnknown = true)
static class Outer {
public ReadServiceAuthorizationResponse readServiceAuthorizationResponse;
}
#JsonIgnoreProperties(ignoreUnknown = true)
public static class ServiceLine {
String statusReason;
String procedureDescription;
String requestedQuantity;
String approvedQuantity;
String deniedQuantity;
String quantityUnitOfMeasure;
Provider[] providers;
}
#JsonIgnoreProperties(ignoreUnknown = true)
public static class Provider {
String providerFirstName;
String providerLastName;
String organizationName;
}
public static void main(String[] args) {
try {
String json = new String(Files.readAllBytes(Paths.get("c:/temp/test.json")));
ServiceAuthorizationDTO dao = ServiceAuthorizationDTO.create(json);
System.out.println("serviceAuthorizationId: " + dao.serviceAuthorizationId);
System.out.println("serviceLines[0].procedureDescription: " + dao.serviceLines[0].procedureDescription);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
When I run it I get this:
serviceAuthorizationId: 50043~220106065198
serviceLines[0].procedureDescription: null
The outer fields in the object like providerId are read from the JSON. But the serviceLines array shows 1 element, and all fields in that class are empty.
Any ideas? This is the first time I've used real objects with JSON. I've always mapped it into Map objects and pulled the fields out manually. Thanks.

Fields in classes ServiceLine and Provider have package-private access modifiers. Jackson can't deserialize into private fields with its default settings. Because it needs getter or setter methods.
Solution 1: Make fields public
public static class ServiceLine {
public String statusReason;
public String procedureDescription;
public String requestedQuantity;
public String approvedQuantity;
public String deniedQuantity;
public String quantityUnitOfMeasure;
public Provider[] providers;
}
Solution 2: Use #JsonAutoDetect annotation
#JsonIgnoreProperties(ignoreUnknown = true)
#JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY)
public class ServiceLine {
String statusReason;
String procedureDescription;
String requestedQuantity;
String approvedQuantity;
String deniedQuantity;
String quantityUnitOfMeasure;
Provider[] providers;
}
Solution 3: Change visibility on the ObjectMapper (doc)
public static ServiceAuthorizationDTO create(String json) {
ObjectMapper objectMapper = new ObjectMapper();
try {
objectMapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
Outer outer = objectMapper.readValue(json, Outer.class);
return outer.readServiceAuthorizationResponse.serviceAuthorization;
} catch (Exception e) {
return null;
}
}

Jackson - deserialize inner list of objects to list of one higher level

With Spring Boot and Jackson, how can I deserialize a wrapped/inner list into a list directly in the outer level?
For example, I have:
{
"transaction": {
"items": {
"item": [
{
"itemNumber": "193487654",
"itemDescription": "Widget",
"itemPrice": "599.00",
"itemQuantity": "1",
"itemBrandName": "ACME",
"itemCategory": "Electronics",
"itemTax": "12.95"
},
{
"itemNumber": "193487654",
"itemDescription": "Widget",
"itemPrice": "599.00",
"itemQuantity": "1",
"itemBrandName": "ACME",
"itemCategory": "Electronics",
"itemTax": "12.95"
}
]
},
...
}
}
In the JSON, item is a list under items; but I want to parse it as a list named items, directly under transaction, instead of defining a DTO Items which contains a list named item.
Is this possible? How to define this DTO Item?
public class TrasactionDTO {
private List<Item> items;
...
}
public class Item {
}
This question is similar but does not solve the problem.
Deserialize wrapped list using Jackson

We need to implement custom deserialiser. Because we want to skip one inner field our implementation should:
{ - skip start object
"any_field_name" - skip any field name. We assume that we have only one inner field.
[{}, ..., {}] - use default deserialiser for List.
} - skip end object
Using above concept implementation should be easy:
public class InnerListDeserializer extends JsonDeserializer<List> implements ContextualDeserializer {
private final JavaType propertyType;
public InnerListDeserializer() {
this(null);
}
public InnerListDeserializer(JavaType propertyType) {
this.propertyType = propertyType;
}
#Override
public List deserialize(JsonParser p, DeserializationContext context) throws IOException {
p.nextToken(); // SKIP START_OBJECT
p.nextToken(); // SKIP any FIELD_NAME
List list = context.readValue(p, propertyType);
p.nextToken(); // SKIP END_OBJECT
return list;
}
#Override
public JsonDeserializer<?> createContextual(DeserializationContext context, BeanProperty property) {
return new InnerListDeserializer(property.getType());
}
}
Let's assume we have JSON payload like this:
{
"transaction": {
"items": {
"item": [
{
"itemNumber": "193487654",
"itemDescription": "Widget",
"itemPrice": "599.00",
"itemQuantity": "1",
"itemBrandName": "ACME",
"itemCategory": "Electronics",
"itemTax": "12.95"
},
{
"itemNumber": "193487654",
"itemDescription": "Widget",
"itemPrice": "599.00",
"itemQuantity": "1",
"itemBrandName": "ACME",
"itemCategory": "Electronics",
"itemTax": "12.95"
}
]
},
"name": "Pickle Rick"
}
}
Above JSON we can map to below POJO classes:
#JsonRootName("transaction")
public class Transaction {
private String name;
private List<Item> items;
#JsonDeserialize(using = InnerListDeserializer.class)
public List<Item> getItems() {
return items;
}
// getters, setters, toString
}
public class Item {
private String itemNumber;
// getters, setters, toString
}
To show it works for many different models let's introduce one more JSON payload:
{
"product": {
"products": {
"innerArray": [
{
"id": "1234"
}
]
}
}
}
and two more POJO classes:
#JsonRootName("product")
class Product {
private List<ProductItem> products;
#JsonDeserialize(using = InnerListDeserializer.class)
public List<ProductItem> getProducts() {
return products;
}
// getters, setters, toString
}
class ProductItem {
private String id;
// getters, setters, toString
}
Now we can test our solution:
import com.fasterxml.jackson.annotation.JsonRootName;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import java.io.File;
import java.io.IOException;
import java.util.List;
public class JSoupTest {
public static void main(String[] args) throws Exception {
ObjectMapper mapper = new ObjectMapper();
mapper.enable(SerializationFeature.INDENT_OUTPUT);
mapper.enable(DeserializationFeature.UNWRAP_ROOT_VALUE);
mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
File jsonFile = new File("Path to 1-st JSON").getAbsoluteFile();
File jsonFile1 = new File("Path to 2-nd JSON").getAbsoluteFile();
System.out.println(mapper.readValue(jsonFile, Transaction.class));
System.out.println(mapper.readValue(jsonFile1, Product.class));
}
}
Above example prints:
Transaction{items=[Item{itemNumber=193487654}, Item{itemNumber=193487654}], name='Pickle Rick'}
Product{products=[ProductItem{id='1234'}]}
For more info read:
Custom Jackson Deserializer Getting Access to Current Field Class
Getting Started with Custom Deserialization in Jackson
Jackson Exceptions – Problems and Solutions
Jackson UNWRAP_ROOT_VALUE
Configuring ObjectMapper in Spring

It seems that #JsonUnwrapped is what I need.
https://www.baeldung.com/jackson-annotations
#JsonUnwrapped defines values that should be unwrapped/flattened when serialized/deserialized.
Let's see exactly how that works; we'll use the annotation to unwrap the property name:
public class UnwrappedUser {
public int id;
#JsonUnwrapped
public Name name;
public static class Name {
public String firstName;
public String lastName;
}
}
Let's now serialize an instance of this class:
#Test
public void whenSerializingUsingJsonUnwrapped_thenCorrect()
throws JsonProcessingException, ParseException {
UnwrappedUser.Name name = new UnwrappedUser.Name("John", "Doe");
UnwrappedUser user = new UnwrappedUser(1, name);
String result = new ObjectMapper().writeValueAsString(user);
assertThat(result, containsString("John"));
assertThat(result, not(containsString("name")));
}
Here's how the output looks like – the fields of the static nested class unwrapped along with the other field:
{
"id":1,
"firstName":"John",
"lastName":"Doe"
}
So, it should be something like:
public class TrasactionDTO {
private List<Item> items;
...
}
public static class Item {
#JsonUnwrapped
private InnerItem innerItem;
...
}
public static class InnerItem {
private String itemNumber;
...
}

You can use a Map to represent the intermediate Items object.
Given this example (all fields public just for demonstration purposes):
public class Item {
public String itemNumber, itemDescription, itemPrice, itemQuantity, itemBrandName, itemCategory, itemTax;
}
...you can achieve what you want in two ways:
1. By using a constructor:
public class TransactionDTO {
private List<Item> items;
#JsonCreator
public TransactionDTO(#JsonProperty("items") final Map<String, List<Item>> items) {
this.items = items.get("item");
}
}
2. By using a setter:
public class TransactionDTO {
private List<Item> items;
public void setItems(final Map<String, List<Item>> items) {
this.items = items.get("item");
}
}

Deserializing stringified (quote enclosed) nested objects with Jackson

I am consuming a "RESTful" service (via RestTemplate) that produces JSON as follows:
{
"id": "abcd1234",
"name": "test",
"connections": {
"default": "http://foo.com/api/",
"dev": "http://dev.foo.com/api/v2"
},
"settings": {
"foo": "{\n \"fooId\": 1, \"token\": \"abc\"}",
"bar": "{\"barId\": 2, \"accountId\": \"d7cj3\"}"
}
}
Note the settings.foo and settings.bar values, which cause issues on deserialization. I would like to be able to deserialize into objects (e.g., settings.getFoo().getFooId(), settings.getFoo().getToken()).
I was able to solve this specifically for an instance of Foo with a custom deserializer:
public class FooDeserializer extends JsonDeserializer<Foo> {
#Override
public Foo deserialize(JsonParser jp, DeserializationContext ctx) throws IOException {
JsonNode node = jp.getCodec().readTree(jp);
String text = node.toString();
String trimmed = text.substring(1, text.length() - 1);
trimmed = trimmed.replace("\\", "");
trimmed = trimmed.replace("\n", "");
ObjectMapper mapper = new ObjectMapper();
JsonNode obj = mapper.readTree(trimmed);
Foo result = mapper.convertValue(obj, Foo.class);
return result;
}
}
#Data
#JsonIgnoreProperties(ignoreUnknown = true)
public class Settings {
#JsonDeserialize(using = FooDeserializer.class)
private Foo foo;
private Bar bar;
}
However, now if I want to deserialize settings.bar, I need to implement another custom deserializer. So I implemented a generic deserializer as follows:
public class QuotedObjectDeserializer<T> extends JsonDeserializer<T> implements ContextualDeserializer {
private Class<?> targetType;
private ObjectMapper mapper;
public QuotedObjectDeserializer(Class<?> targetType, ObjectMapper mapper) {
this.targetType = targetType;
this.mapper = mapper;
}
#Override
public JsonDeserializer<T> createContextual(DeserializationContext context, BeanProperty property) {
this.targetType = property.getType().containedType(1).getRawClass();
return new QuotedObjectDeserializer<T>(this.targetType, this.mapper);
}
#Override
public T deserialize(JsonParser jp, DeserializationContext context) throws IOException {
JsonNode node = jp.getCodec().readTree(jp);
String text = node.toString();
String trimmed = text.substring(1, text.length() - 1);
trimmed = trimmed.replace("\\", "");
trimmed = trimmed.replace("\n", "");
JsonNode obj = this.mapper.readTree(trimmed);
return this.mapper.convertValue(obj, this.mapper.getTypeFactory().constructType(this.targetType));
}
}
Now I'm not sure how to actually use the deserializer, as annotating Settings.Foo with #JsonDeserialize(using = QuotedObjectDeserializer.class) obviously does not work.
Is there a way to annotate properties to use a generic custom deserializer? Or, perhaps more likely, is there a way to configure the default deserializers to handle the stringy objects returned in my example JSON?
Edit: The problem here is specifically deserializing settings.foo and settings.bar as objects. The JSON representation has these objects wrapped in quotes (and polluted with escape sequences), so they are deserialized as Strings.

Sorry about the length of the code here. There are plenty of shortcuts here (no encapsulation; added e to defaulte to avoid keyword etc.) but the intent is there
Model class:
package com.odwyer.rian.test;
import java.io.IOException;
import org.apache.commons.lang3.builder.ReflectionToStringBuilder;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class Model {
public String id;
public String name;
public Connections connections;
public Settings settings;
public static class Connections {
public String defaulte;
public String dev;
#Override
public String toString() {
return ReflectionToStringBuilder.toString(this);
}
}
public static class Foo {
public Foo () {}
#JsonCreator
public static Foo create(String str) throws JsonParseException, JsonMappingException, IOException {
return (new ObjectMapper()).readValue(str, Foo.class);
}
public Integer fooId;
public String token;
#Override
public String toString() {
return ReflectionToStringBuilder.toString(this);
}
}
public static class Bar {
public Bar() {}
#JsonCreator
public static Bar create(String str) throws JsonParseException, JsonMappingException, IOException {
return (new ObjectMapper()).readValue(str, Bar.class);
}
public Integer barId;
public String accountId;
#Override
public String toString() {
return ReflectionToStringBuilder.toString(this);
}
}
public static class Settings {
public Foo foo;
public Bar bar;
#Override
public String toString() {
return ReflectionToStringBuilder.toString(this);
}
}
#Override
public String toString() {
return ReflectionToStringBuilder.toString(this);
}
}
The caller:
package com.odwyer.rian.test;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class TestClass {
private static ObjectMapper objectMapper = new ObjectMapper();
public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
Scanner file = new Scanner(new File("test.json"));
String jsonStr = file.useDelimiter("\\Z").next();
Model model = objectMapper.readValue(jsonStr, Model.class);
System.out.println(model.toString());
}
}
The result (too much hassle to format out but it is all there!):
com.odwyer.rian.test.Model#190083e[id=abcd1234,name=test,connections=com.odwyer.rian.test.Model$Connections#170d1f3f[defaulte=http://foo.com/api/,dev=http://dev.foo.com/api/v2],settings=com.odwyer.rian.test.Model$Settings#5e7e6ceb[foo=com.odwyer.rian.test.Model$Foo#3e20e8c4[fooId=1,token=abc],bar=com.odwyer.rian.test.Model$Bar#6291bbb9[barId=2,accountId=d7cj3]]]
The key, courtesy of Ted and his post (https://stackoverflow.com/a/8369322/2960707) is the #JsonCreator annotation

jackson deserialize list of custom objects

I have the following JSON which I'm trying to deserialize using the Jackson API
"attachments": {
"file1": {
"content": "",
"name": "sample.json",
"type": "application/json"
},
"file2": {
"content": ""
"name": "myspreadsheet.xlsx",
"type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
}
},
I basically need an Attachment class which has a list of AttachmentFile objects which would look like this:
public static AttachmentFile {
String content;
String name;
String type;
}
How can I achieve this using a custom deserializer?
Thanks!

I use jackson 1.9.12 and there are no problems serialize and deserialize HashMap.
Attachments:
import java.util.Map;
public class Attachments
{
//#JsonDeserialize(as=HashMap.class) // use this if you want a HashMap
public Map<String, AttachmentFile> attachments;
public Attachments() {
}
public Attachments(
final Map<String, AttachmentFile> attachments
) {
this.attachments = attachments;
}
}
AttachmentFile:
public class AttachmentFile
{
public String content;
public String name;
public String type;
public AttachmentFile() {
}
public AttachmentFile(
final String content,
final String name,
final String type
) {
this.content = content;
this.name = name;
this.type = type;
}
}
Test:
import java.util.HashMap;
import java.util.Map;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.junit.Assert;
import org.junit.Test;
public class AttachmentsTest
{
#Test
public void test()
{
try {
final Map<String, AttachmentFile> attachments = new HashMap<String, AttachmentFile>();
attachments.put(
"file1",
new AttachmentFile(
"",
"sample.json",
"application/json"
)
);
attachments.put(
"file2",
new AttachmentFile(
"",
"myspreadsheet.xlsx",
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
)
);
final Attachments inputData = new Attachments();
inputData.attachments = attachments;
final ObjectMapper jsonMapper = new ObjectMapper();
jsonMapper.configure(SerializationConfig.Feature.INDENT_OUTPUT, true);
final String jsonString = jsonMapper.writeValueAsString(inputData);
//System.out.println(jsonString);
final Attachments outputData = jsonMapper.readValue(jsonString, inputData.getClass());
Assert.assertNotNull(outputData);
Assert.assertEquals(inputData.attachments.size(), outputData.attachments.size());
Assert.assertEquals(inputData.attachments.get("file1").name, outputData.attachments.get("file1").name);
Assert.assertEquals(inputData.attachments.get("file2").name, outputData.attachments.get("file2").name);
} catch (final Exception e) {
Assert.fail(e.getMessage());
}
}
}

You do not need a custom deserializer.
Using jacksons #JsonAnySetter annotation, you can write a method in your attachment class that looks like this
class Attachment
{
ArrayList files = new ArrayList();
#JsonAnySetter
public void setFile(String name, Object value)
{
files.add(value);
}
}
You may have to tweak that code (using more annotations), to make sure that value is deserialized as AttachmentFile. But I think you get the basic idea.