fix nulls

1 files changed, 3 insertions, 3 deletions

diff --git a/src/main/java/design/persistence/JSONLeagueDatabase.java b/src/main/java/design/persistence/JSONLeagueDatabase.java
index 795c582..81a4913 100644
--- a/src/main/java/design/persistence/JSONLeagueDatabase.java
+++ b/src/main/java/design/persistence/JSONLeagueDatabase.java
@@ -1,8 +1,6 @@
 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.annotation.*;
 import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
@@ -15,6 +13,7 @@ import java.io.File;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 public class JSONLeagueDatabase implements LeagueDatabase {
@@ -48,6 +47,7 @@ public class JSONLeagueDatabase implements LeagueDatabase {
         mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
         mapper.registerModule(new ParameterNamesModule(JsonCreator.Mode.PROPERTIES));
         mapper.registerModule(new JavaTimeModule());
+        mapper.configOverride(List.class).setSetterInfo(JsonSetter.Value.forValueNulls(Nulls.AS_EMPTY));
 
         try {
             load();