Test Serialize/Deserialize Optional with Jackson

jackson/src/main/java/com/baeldung/jackson/miscellaneous/mixin/Book.java

@@ -0,0 +1,25 @@
+package com.baeldung.jackson.miscellaneous.mixin;
+
+import java.util.Optional;
+
+public class Book {
+
+    private String title;
+    private Optional<String> subTitle;
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public Optional<String> getSubTitle() {
+        return subTitle;
+    }
+
+    public void setSubTitle(Optional<String> subTitle) {
+        this.subTitle = subTitle;
+    }
+}