BAEL-5115 Deduction-Based Polymorphism in Jackson 2.12 (#11732)

* BAEL-5115 Deduction-Based Polymorphism in Jackson 2.12

* Fix pmd

* Code review changes

* Improvements

* Code review

* Code review

* fix typo

* Rename package

* Apply formatter

* Add old deduction

* revert

jackson-modules/jackson-annotations/src/main/java/com/baeldung/jackson/deductionbasedpolymorphism/Character.java

@@ -0,0 +1,12 @@
+package com.baeldung.jackson.deductionbasedpolymorphism;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonSubTypes.Type;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.annotation.JsonTypeInfo.Id;
+
+@JsonTypeInfo(use = Id.DEDUCTION)
+@JsonSubTypes({ @Type(ImperialSpy.class), @Type(King.class), @Type(Knight.class) })
+public interface Character {
+
+}

jackson-modules/jackson-annotations/src/main/java/com/baeldung/jackson/deductionbasedpolymorphism/ControlledCharacter.java

@@ -0,0 +1,14 @@
+package com.baeldung.jackson.deductionbasedpolymorphism;
+
+public class ControlledCharacter {
+
+    private Character character;
+
+    public Character getCharacter() {
+        return character;
+    }
+
+    public void setCharacter(Character character) {
+        this.character = character;
+    }
+}

jackson-modules/jackson-annotations/src/main/java/com/baeldung/jackson/deductionbasedpolymorphism/ImperialSpy.java

@@ -0,0 +1,5 @@
+package com.baeldung.jackson.deductionbasedpolymorphism;
+
+public class ImperialSpy implements Character {
+
+}

jackson-modules/jackson-annotations/src/main/java/com/baeldung/jackson/deductionbasedpolymorphism/King.java

@@ -0,0 +1,14 @@
+package com.baeldung.jackson.deductionbasedpolymorphism;
+
+public class King extends NamedCharacter {
+
+    private String land;
+
+    public String getLand() {
+        return land;
+    }
+
+    public void setLand(String land) {
+        this.land = land;
+    }
+}

jackson-modules/jackson-annotations/src/main/java/com/baeldung/jackson/deductionbasedpolymorphism/Knight.java

@@ -0,0 +1,14 @@
+package com.baeldung.jackson.deductionbasedpolymorphism;
+
+public class Knight extends NamedCharacter {
+
+    private String weapon;
+
+    public String getWeapon() {
+        return weapon;
+    }
+
+    public void setWeapon(String weapon) {
+        this.weapon = weapon;
+    }
+}

jackson-modules/jackson-annotations/src/main/java/com/baeldung/jackson/deductionbasedpolymorphism/NamedCharacter.java

@@ -0,0 +1,14 @@
+package com.baeldung.jackson.deductionbasedpolymorphism;
+
+public class NamedCharacter implements Character {
+
+    private String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}