BAEL-5649 (#12677)

* add hexagonal architecture example project

* rename class

* add unit test and integration test

* add new line

* reorder pom

* remove maven wrapper

* [BAEL-5649] add article code

* remove files added by mistake

* get parameter type using reflection and serioalize JSON into POJOs

* clean code

* clean code

* reformat

* implement PR feedback

* reformat with contiunation space eq to 2

* replace UserDto with firstName and lastName

spring-web-modules/spring-mvc-basics-5/src/main/java/com/baeldung/jsonargs/UserDto.java

@@ -0,0 +1,46 @@
+package com.baeldung.jsonargs;
+
+public class UserDto {
+
+    private String firstName;
+    private String lastName;
+    private String age;
+    private AddressDto address;
+
+    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;
+    }
+
+    public String getAge() {
+        return age;
+    }
+
+    public void setAge(String age) {
+        this.age = age;
+    }
+
+    public AddressDto getAddress() {
+        return address;
+    }
+
+    public void setAddress(AddressDto address) {
+        this.address = address;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" + "firstName='" + firstName + '\'' + ", lastName='" + lastName + '\'' + ", age='" + age + '\'' + ", address=" + address + '}';
+    }
+}