4 files changed, 14 insertions, 6 deletions
diff --git a/src/main/java/design/model/Golfer.java b/src/main/java/design/model/Golfer.java
index 1a6c7b6..04ad8bc 100644
--- a/src/main/java/design/model/Golfer.java
+++ b/src/main/java/design/model/Golfer.java
@@ -1,5 +1,7 @@
 package design.model;
 
+import com.fasterxml.jackson.annotation.JsonCreator;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -10,8 +12,8 @@ public class Golfer {
     private final List<Course> courses;
     private final List<Round> rounds;
 
-    // for deserialization
-    public Golfer(String username, int passwordHash, String fullName, List<Course> courses, List<Round> rounds) {
+    @JsonCreator
+    private Golfer(String username, int passwordHash, String fullName, List<Course> courses, List<Round> rounds) {
         this.username = username;
         this.passwordHash = passwordHash;
         this.fullName = fullName;
diff --git a/src/main/java/design/model/Play.java b/src/main/java/design/model/Play.java
index cf44cd8..ca6dac2 100644
--- a/src/main/java/design/model/Play.java
+++ b/src/main/java/design/model/Play.java
@@ -1,5 +1,7 @@
 package design.model;
 
+import com.fasterxml.jackson.annotation.JsonCreator;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -7,7 +9,7 @@ public class Play {
     private final int distance;
     private final List<Swing> swings;
 
-    // for deserialization
+    @JsonCreator
     private Play(int distance, List<Swing> swings) {
         this.distance = distance;
         this.swings = swings;
diff --git a/src/main/java/design/model/Round.java b/src/main/java/design/model/Round.java
index 39de907..048a21a 100644
--- a/src/main/java/design/model/Round.java
+++ b/src/main/java/design/model/Round.java
@@ -1,5 +1,7 @@
 package design.model;
 
+import com.fasterxml.jackson.annotation.JsonCreator;
+
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
@@ -10,7 +12,7 @@ public class Round {
     private final Hole startingHole;
     private final List<Play> plays;
 
-    // for deserialization
+    @JsonCreator
     private Round(Course course, LocalDateTime dateTime, Hole startingHole, List<Play> plays) {
         this.course = course;
         this.dateTime = dateTime;
diff --git a/src/main/java/design/persistence/JSONPersonalDatabase.java b/src/main/java/design/persistence/JSONPersonalDatabase.java
index 511d962..dd63407 100644
--- a/src/main/java/design/persistence/JSONPersonalDatabase.java
+++ b/src/main/java/design/persistence/JSONPersonalDatabase.java
@@ -1,11 +1,13 @@
 package design.persistence;
 
 import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.PropertyAccessor;
 import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
 import design.model.Course;
 import design.model.Golfer;
 
@@ -30,7 +32,7 @@ public class JSONPersonalDatabase implements PersonalDatabase {
         module.addSerializer(Course.class, new CourseIdSerializer());
         mapper.registerModule(module);
         mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
-        mapper.writerWithDefaultPrettyPrinter();
+        mapper.registerModule(new ParameterNamesModule(JsonCreator.Mode.PROPERTIES));
 
         try {
             load();
@@ -49,7 +51,7 @@ public class JSONPersonalDatabase implements PersonalDatabase {
 
     private void save() throws IOException {
         Golfer[] data = cache.values().toArray(Golfer[]::new);
-        mapper.writeValue(file, data);
+        mapper.writerWithDefaultPrettyPrinter().writeValue(file, data);
     }
 
     @Override