Adding source code for article tracked under BAEL-4109.

spring-webflux-threads/src/main/java/com/baeldung/webflux/Person.java

@@ -0,0 +1,27 @@
+package com.baeldung.webflux;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@Document
+public class Person {
+    @Id
+    String id;
+
+    public Person(String id) {
+        this.id = id;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    @Override
+    public String toString() {
+        return "Person{" + "id='" + id + '\'' + '}';
+    }
+}