diff --git a/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Employee.java b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Employee.java
new file mode 100644
index 0000000000..44b10ee39b
--- /dev/null
+++ b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Employee.java
@@ -0,0 +1,24 @@
+package com.baeldung.jackson.deserialization.immutable;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class Employee {
+
+    private final long id;
+    private final String name;
+
+    @JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
+    public Employee(@JsonProperty("id") long id, @JsonProperty("name") String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+}
diff --git a/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/MaritalAwarePerson.java b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/MaritalAwarePerson.java
deleted file mode 100644
index cb593b3bb7..0000000000
--- a/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/MaritalAwarePerson.java
+++ /dev/null
@@ -1,58 +0,0 @@
-package com.baeldung.jackson.deserialization.immutable;
-
-import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
-import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
-
-@JsonDeserialize(builder = MaritalAwarePerson.Builder.class)
-public class MaritalAwarePerson {
-
-    private final String name;
-    private final int age;
-    private final Boolean married;
-
-    private MaritalAwarePerson(String name, int age, Boolean married) {
-        this.name = name;
-        this.age = age;
-        this.married = married;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public int getAge() {
-        return age;
-    }
-
-    public Boolean getMarried() {
-        return married;
-    }
-
-    @JsonPOJOBuilder
-    static class Builder {
-        String name;
-        int age;
-        Boolean married;
-
-        Builder withName(String name) {
-            this.name = name;
-            return this;
-        }
-
-        Builder withAge(int age) {
-            this.age = age;
-            return this;
-        }
-
-        Builder withMarried(boolean married) {
-            this.married = married;
-            return this;
-        }
-
-        public MaritalAwarePerson build() {
-            return new MaritalAwarePerson(name, age, married);
-        }
-
-
-    }
-}
diff --git a/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Person.java b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Person.java
index 0214f93ca9..d9041720b6 100644
--- a/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Person.java
+++ b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Person.java
@@ -1,15 +1,15 @@
 package com.baeldung.jackson.deserialization.immutable;
 
-import com.fasterxml.jackson.annotation.JsonCreator;
-import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
 
+@JsonDeserialize(builder = Person.Builder.class)
 public class Person {
 
     private final String name;
-    private final int age;
+    private final Integer age;
 
-    @JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
-    public Person(@JsonProperty("name") String name, @JsonProperty("age") int age) {
+    private Person(String name, Integer age) {
         this.name = name;
         this.age = age;
     }
@@ -18,7 +18,27 @@ public class Person {
         return name;
     }
 
-    public int getAge() {
+    public Integer getAge() {
         return age;
     }
+
+    @JsonPOJOBuilder
+    static class Builder {
+        String name;
+        Integer age;
+
+        Builder withName(String name) {
+            this.name = name;
+            return this;
+        }
+
+        Builder withAge(Integer age) {
+            this.age = age;
+            return this;
+        }
+
+        Person build() {
+            return new Person(name, age);
+        }
+    }
 }
diff --git a/jackson/src/test/java/com/baeldung/jackson/deserialization/immutable/ImmutableObjectDeserializationUnitTest.java b/jackson/src/test/java/com/baeldung/jackson/deserialization/immutable/ImmutableObjectDeserializationUnitTest.java
index 5c33a2da26..1252179e3a 100644
--- a/jackson/src/test/java/com/baeldung/jackson/deserialization/immutable/ImmutableObjectDeserializationUnitTest.java
+++ b/jackson/src/test/java/com/baeldung/jackson/deserialization/immutable/ImmutableObjectDeserializationUnitTest.java
@@ -11,30 +11,28 @@ public class ImmutableObjectDeserializationUnitTest {
 
     @Test
     public void whenPublicConstructorIsUsed_thenObjectIsDeserialized() throws IOException {
-        final String json = "{\"name\":\"Frank\",\"age\":50}";
-        Person person = new ObjectMapper().readValue(json, Person.class);
+        final String json = "{\"name\":\"Frank\",\"id\":5000}";
+        Employee employee = new ObjectMapper().readValue(json, Employee.class);
 
-        assertEquals("Frank", person.getName());
-        assertEquals(50, person.getAge());
+        assertEquals("Frank", employee.getName());
+        assertEquals(5000, employee.getId());
     }
 
     @Test
     public void whenBuilderIsUsedAndFieldIsNull_thenObjectIsDeserialized() throws IOException {
-        final String json = "{\"name\":\"Frank\",\"age\":50}";
-        MaritalAwarePerson person = new ObjectMapper().readValue(json, MaritalAwarePerson.class);
+        final String json = "{\"name\":\"Frank\"}";
+        Person person = new ObjectMapper().readValue(json, Person.class);
 
         assertEquals("Frank", person.getName());
-        assertEquals(50, person.getAge());
-        assertNull(person.getMarried());
+        assertNull(person.getAge());
     }
 
     @Test
     public void whenBuilderIsUsedAndAllFieldsPresent_thenObjectIsDeserialized() throws IOException {
-        final String json = "{\"name\":\"Frank\",\"age\":50,\"married\":true}";
-        MaritalAwarePerson person = new ObjectMapper().readValue(json, MaritalAwarePerson.class);
+        final String json = "{\"name\":\"Frank\",\"age\":50}";
+        Person person = new ObjectMapper().readValue(json, Person.class);
 
         assertEquals("Frank", person.getName());
-        assertEquals(50, person.getAge());
-        assertTrue(person.getMarried());
+        assertEquals(50, (int) person.getAge());
     }
 }