Add logic for JSON to OBJ

jackson-simple/README.md

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+### Jackson Articles that are also part of the e-book
+
+This module contains articles about Jackson that are also part of the Jackson Ebook.
+
+### The Course
+
+The "REST With Spring" Classes: http://bit.ly/restwithspring
+
+### Relevant Articles:
+- [Jackson Annotation Examples](https://www.baeldung.com/jackson-annotations)
+- [Intro to the Jackson ObjectMapper](https://www.baeldung.com/jackson-object-mapper-tutorial)
+- [Jackson Ignore Properties on Marshalling](https://www.baeldung.com/jackson-ignore-properties-on-serialization)
+- [Ignore Null Fields with Jackson](https://www.baeldung.com/jackson-ignore-null-fields)
+- [Jackson – Change Name of Field](https://www.baeldung.com/jackson-name-of-property)
+- [Jackson Unmarshalling JSON with Unknown Properties](https://www.baeldung.com/jackson-deserialize-json-unknown-properties)
+
+### NOTE: 
+
+Since this is a module tied to an e-book, it should **not** be moved or used to store the code for any further article.

jackson-simple/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>jackson-simple</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>jackson-simple</name>
+
+    <parent>
+        <groupId>com.ossez</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.2-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <!--jackson for xml -->
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-xml</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>jackson-simple</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+</project>

jackson-simple/src/main/java/com/ossez/jackson/annotation/AliasBean.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonAlias;
+
+public class AliasBean {
+    
+    @JsonAlias({ "fName", "f_name" })
+    private String firstName;
+    
+    private String lastName;
+    
+    public AliasBean() {
+    
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/BeanWithCreator.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class BeanWithCreator {
+    public int id;
+    public String name;
+
+    @JsonCreator
+    public BeanWithCreator(@JsonProperty("id") final int id, @JsonProperty("theName") final String name) {
+        this.id = id;
+        this.name = name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/BeanWithCustomAnnotation.java

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+package com.ossez.jackson.annotation;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.Date;
+
+import com.ossez.jackson.annotation.BeanWithCustomAnnotation.CustomAnnotation;
+
+import com.fasterxml.jackson.annotation.JacksonAnnotationsInside;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonInclude.Include;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+@CustomAnnotation
+public class BeanWithCustomAnnotation {
+    public int id;
+    public String name;
+    public Date dateCreated;
+
+    public BeanWithCustomAnnotation() {
+
+    }
+
+    public BeanWithCustomAnnotation(final int id, final String name, final Date dateCreated) {
+        this.id = id;
+        this.name = name;
+        this.dateCreated = dateCreated;
+    }
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @JacksonAnnotationsInside
+    @JsonInclude(Include.NON_NULL)
+    @JsonPropertyOrder({ "name", "id", "dateCreated" })
+    public @interface CustomAnnotation {
+
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/BeanWithFilter.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonFilter;
+
+@JsonFilter("myFilter")
+public class BeanWithFilter {
+    public int id;
+    public String name;
+
+    public BeanWithFilter() {
+
+    }
+
+    public BeanWithFilter(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/BeanWithGetter.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonGetter;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonSetter;
+
+public class BeanWithGetter {
+    public int id;
+    private String name;
+
+    public BeanWithGetter() {
+
+    }
+
+    public BeanWithGetter(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    @JsonProperty("name")
+    @JsonSetter("name")
+    public void setTheName(final String name) {
+        this.name = name;
+    }
+
+    @JsonProperty("name")
+    @JsonGetter("name")
+    public String getTheName() {
+        return name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/BeanWithIgnore.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+@JsonIgnoreProperties({ "id" })
+public class BeanWithIgnore {
+    @JsonIgnore
+    public int id;
+    public String name;
+
+    public BeanWithIgnore() {
+
+    }
+
+    public BeanWithIgnore(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/BeanWithInject.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JacksonInject;
+
+public class BeanWithInject {
+    @JacksonInject
+    public int id;
+    public String name;
+
+    public BeanWithInject() {
+
+    }
+
+    public BeanWithInject(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/ExtendableBean.java

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+package com.ossez.jackson.annotation;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
+import com.fasterxml.jackson.annotation.JsonAnySetter;
+
+public class ExtendableBean {
+    public String name;
+    private Map<String, String> properties;
+
+    public ExtendableBean() {
+        properties = new HashMap<String, String>();
+    }
+
+    public ExtendableBean(final String name) {
+        this.name = name;
+        properties = new HashMap<String, String>();
+    }
+
+    @JsonAnySetter
+    public void add(final String key, final String value) {
+        properties.put(key, value);
+    }
+
+    @JsonAnyGetter
+    public Map<String, String> getProperties() {
+        return properties;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/MyBean.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonGetter;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonInclude.Include;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import com.fasterxml.jackson.annotation.JsonSetter;
+
+@JsonInclude(Include.NON_NULL)
+@JsonPropertyOrder({ "name", "id" })
+public class MyBean {
+    public int id;
+    public String name;
+
+    public MyBean() {
+
+    }
+
+    public MyBean(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+    }
+    
+    @JsonGetter("name")
+    public String getTheName() {
+        return name;
+    }
+    
+    @JsonSetter("name")
+    public void setTheName(String name) {
+        this.name = name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/PrivateBean.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
+
+@JsonAutoDetect(fieldVisibility = Visibility.ANY)
+public class PrivateBean {
+    private int id;
+    private String name;
+
+    public PrivateBean() {
+
+    }
+
+    public PrivateBean(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/RawBean.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonRawValue;
+
+public class RawBean {
+    public String name;
+
+    @JsonRawValue
+    public String json;
+
+    public RawBean() {
+
+    }
+
+    public RawBean(final String name, final String json) {
+        this.name = name;
+        this.json = json;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/UnwrappedUser.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonUnwrapped;
+
+public class UnwrappedUser {
+    public int id;
+
+    @JsonUnwrapped
+    public Name name;
+
+    public UnwrappedUser() {
+
+    }
+
+    public UnwrappedUser(final int id, final Name name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public static class Name {
+        public String firstName;
+        public String lastName;
+
+        public Name() {
+
+        }
+
+        public Name(final String firstName, final String lastName) {
+            this.firstName = firstName;
+            this.lastName = lastName;
+        }
+    }
+
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/UserWithIgnoreType.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreType;
+
+public class UserWithIgnoreType {
+    public int id;
+
+    public Name name;
+
+    public UserWithIgnoreType() {
+
+    }
+
+    public UserWithIgnoreType(final int id, final Name name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    @JsonIgnoreType
+    public static class Name {
+        public String firstName;
+        public String lastName;
+
+        public Name() {
+
+        }
+
+        public Name(final String firstName, final String lastName) {
+            this.firstName = firstName;
+            this.lastName = lastName;
+        }
+    }
+
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/Zoo.java

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+package com.ossez.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+
+public class Zoo {
+    public Animal animal;
+
+    public Zoo() {
+
+    }
+
+    public Zoo(final Animal animal) {
+        this.animal = animal;
+    }
+
+    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = As.PROPERTY, property = "type")
+    @JsonSubTypes({ @JsonSubTypes.Type(value = Dog.class, name = "dog"), @JsonSubTypes.Type(value = Cat.class, name = "cat") })
+    public static class Animal {
+        public String name;
+
+        public Animal() {
+        }
+
+        public Animal(final String name) {
+            this.name = name;
+        }
+    }
+
+    @JsonTypeName("dog")
+    public static class Dog extends Animal {
+        public double barkVolume;
+
+        public Dog() {
+        }
+
+        public Dog(final String name) {
+            this.name = name;
+        }
+    }
+
+    @JsonTypeName("cat")
+    public static class Cat extends Animal {
+        boolean likesCream;
+        public int lives;
+
+        public Cat() {
+        }
+
+        public Cat(final String name) {
+            this.name = name;
+        }
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/bidirection/ItemWithIdentity.java

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+package com.ossez.jackson.annotation.bidirection;
+
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+
+@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
+public class ItemWithIdentity {
+    public int id;
+    public String itemName;
+    public UserWithIdentity owner;
+
+    public ItemWithIdentity() {
+        super();
+    }
+
+    public ItemWithIdentity(final int id, final String itemName, final UserWithIdentity owner) {
+        this.id = id;
+        this.itemName = itemName;
+        this.owner = owner;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/bidirection/ItemWithIgnore.java

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+package com.ossez.jackson.annotation.bidirection;
+
+public class ItemWithIgnore {
+    public int id;
+    public String itemName;
+    public UserWithIgnore owner;
+
+    public ItemWithIgnore() {
+        super();
+    }
+
+    public ItemWithIgnore(final int id, final String itemName, final UserWithIgnore owner) {
+        this.id = id;
+        this.itemName = itemName;
+        this.owner = owner;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/bidirection/ItemWithRef.java

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+package com.ossez.jackson.annotation.bidirection;
+
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+
+public class ItemWithRef {
+    public int id;
+    public String itemName;
+
+    @JsonManagedReference
+    public UserWithRef owner;
+
+    public ItemWithRef() {
+        super();
+    }
+
+    public ItemWithRef(final int id, final String itemName, final UserWithRef owner) {
+        this.id = id;
+        this.itemName = itemName;
+        this.owner = owner;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/bidirection/UserWithIdentity.java

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+package com.ossez.jackson.annotation.bidirection;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+
+@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
+public class UserWithIdentity {
+    public int id;
+    public String name;
+    public List<ItemWithIdentity> userItems;
+
+    public UserWithIdentity() {
+        super();
+    }
+
+    public UserWithIdentity(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+        userItems = new ArrayList<ItemWithIdentity>();
+    }
+
+    public void addItem(final ItemWithIdentity item) {
+        userItems.add(item);
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/bidirection/UserWithIgnore.java

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+package com.ossez.jackson.annotation.bidirection;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+public class UserWithIgnore {
+    public int id;
+    public String name;
+
+    @JsonIgnore
+    public List<ItemWithIgnore> userItems;
+
+    public UserWithIgnore() {
+        super();
+    }
+
+    public UserWithIgnore(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+        userItems = new ArrayList<ItemWithIgnore>();
+    }
+
+    public void addItem(final ItemWithIgnore item) {
+        userItems.add(item);
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/bidirection/UserWithRef.java

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+package com.ossez.jackson.annotation.bidirection;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonBackReference;
+
+public class UserWithRef {
+    public int id;
+    public String name;
+
+    @JsonBackReference
+    public List<ItemWithRef> userItems;
+
+    public UserWithRef() {
+        super();
+    }
+
+    public UserWithRef(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+        userItems = new ArrayList<ItemWithRef>();
+    }
+
+    public void addItem(final ItemWithRef item) {
+        userItems.add(item);
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/date/CustomDateDeserializer.java

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+package com.ossez.jackson.annotation.date;
+
+import java.io.IOException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+
+public class CustomDateDeserializer extends StdDeserializer<Date> {
+
+    private static final long serialVersionUID = -5451717385630622729L;
+    private SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
+
+    public CustomDateDeserializer() {
+        this(null);
+    }
+
+    public CustomDateDeserializer(final Class<?> vc) {
+        super(vc);
+    }
+
+    @Override
+    public Date deserialize(final JsonParser jsonparser, final DeserializationContext context) throws IOException, JsonProcessingException {
+        final String date = jsonparser.getText();
+        try {
+            return formatter.parse(date);
+        } catch (final ParseException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/date/CustomDateSerializer.java

@@ -0,0 +1,29 @@
+package com.ossez.jackson.annotation.date;
+
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+
+public class CustomDateSerializer extends StdSerializer<Date> {
+
+    private static final long serialVersionUID = -2894356342227378312L;
+    private SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
+
+    public CustomDateSerializer() {
+        this(null);
+    }
+
+    public CustomDateSerializer(final Class<Date> t) {
+        super(t);
+    }
+
+    @Override
+    public void serialize(final Date value, final JsonGenerator gen, final SerializerProvider arg2) throws IOException, JsonProcessingException {
+        gen.writeString(formatter.format(value));
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/date/EventWithFormat.java

@@ -0,0 +1,29 @@
+package com.ossez.jackson.annotation.date;
+
+import java.util.Date;
+
+import com.fasterxml.jackson.annotation.JsonFormat;
+
+public class EventWithFormat {
+    public String name;
+
+    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy hh:mm:ss")
+    public Date eventDate;
+
+    public EventWithFormat() {
+        super();
+    }
+
+    public EventWithFormat(final String name, final Date eventDate) {
+        this.name = name;
+        this.eventDate = eventDate;
+    }
+
+    public Date getEventDate() {
+        return eventDate;
+    }
+
+    public String getName() {
+        return name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/date/EventWithSerializer.java

@@ -0,0 +1,31 @@
+package com.ossez.jackson.annotation.date;
+
+import java.util.Date;
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+public class EventWithSerializer {
+    public String name;
+
+    @JsonDeserialize(using = CustomDateDeserializer.class)
+    @JsonSerialize(using = CustomDateSerializer.class)
+    public Date eventDate;
+
+    public EventWithSerializer() {
+        super();
+    }
+
+    public EventWithSerializer(final String name, final Date eventDate) {
+        this.name = name;
+        this.eventDate = eventDate;
+    }
+
+    public Date getEventDate() {
+        return eventDate;
+    }
+
+    public String getName() {
+        return name;
+    }
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/deserialization/ItemDeserializerOnClass.java

@@ -0,0 +1,41 @@
+package com.ossez.jackson.annotation.deserialization;
+
+import java.io.IOException;
+
+import com.ossez.jackson.annotation.dtos.ItemWithSerializer;
+import com.ossez.jackson.annotation.dtos.User;
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+import com.fasterxml.jackson.databind.node.IntNode;
+
+public class ItemDeserializerOnClass extends StdDeserializer<ItemWithSerializer> {
+
+    private static final long serialVersionUID = 5579141241817332594L;
+
+    public ItemDeserializerOnClass() {
+        this(null);
+    }
+
+    public ItemDeserializerOnClass(final Class<?> vc) {
+        super(vc);
+    }
+
+    /**
+     * {"id":1,"itemNr":"theItem","owner":2}
+     */
+    @Override
+    public ItemWithSerializer deserialize(final JsonParser jp, final DeserializationContext ctxt) throws IOException, JsonProcessingException {
+        final JsonNode node = jp.getCodec()
+            .readTree(jp);
+        final int id = (Integer) ((IntNode) node.get("id")).numberValue();
+        final String itemName = node.get("itemName")
+            .asText();
+        final int userId = (Integer) ((IntNode) node.get("owner")).numberValue();
+
+        return new ItemWithSerializer(id, itemName, new User(userId, null));
+    }
+
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/dtos/Item.java

@@ -0,0 +1,32 @@
+package com.ossez.jackson.annotation.dtos;
+
+public class Item {
+    public int id;
+    public String itemName;
+    public User owner;
+
+    public Item() {
+        super();
+    }
+
+    public Item(final int id, final String itemName, final User owner) {
+        this.id = id;
+        this.itemName = itemName;
+        this.owner = owner;
+    }
+
+    // API
+
+    public int getId() {
+        return id;
+    }
+
+    public String getItemName() {
+        return itemName;
+    }
+
+    public User getOwner() {
+        return owner;
+    }
+
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/dtos/ItemWithSerializer.java

@@ -0,0 +1,36 @@
+package com.ossez.jackson.annotation.dtos;
+
+import com.ossez.jackson.annotation.deserialization.ItemDeserializerOnClass;
+import com.ossez.jackson.annotation.serialization.ItemSerializerOnClass;
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+@JsonSerialize(using = ItemSerializerOnClass.class)
+@JsonDeserialize(using = ItemDeserializerOnClass.class)
+public class ItemWithSerializer {
+    public final int id;
+    public final String itemName;
+    public final User owner;
+
+    public ItemWithSerializer(final int id, final String itemName, final User owner) {
+        this.id = id;
+        this.itemName = itemName;
+        this.owner = owner;
+    }
+
+    // API
+
+    public int getId() {
+        return id;
+    }
+
+    public String getItemName() {
+        return itemName;
+    }
+
+    public User getOwner() {
+        return owner;
+    }
+
+}

jackson-simple/src/main/java/com/ossez/jackson/annotation/dtos/User.java

@@ -0,0 +1,26 @@
+package com.ossez.jackson.annotation.dtos;
+
+public class User {
+    public int id;
+    public String name;
+
+    public User() {
+        super();
+    }
+
+    public User(final int id, final String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    // API
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+}