chore: add annotations

Author: sysnote8main

src/main/java/net/azisaba/kdstatusreloaded/api/KDSAPI.java

@@ -2,10 +2,12 @@
 
 import net.azisaba.kdstatusreloaded.KDStatusReloaded;
 import net.azisaba.kdstatusreloaded.playerkd.model.KDUserData;
+import org.jspecify.annotations.NullMarked;
 
 import java.util.Optional;
 import java.util.UUID;
 
+@NullMarked
 public class KDSAPI {
     public static KDUserData getPlayerData(UUID uuid) {
         Optional<KDUserData> data = KDStatusReloaded.getPlugin().getPlayerKd().getPlayerDataWithNoCaching(uuid);

src/main/java/net/azisaba/kdstatusreloaded/playerkd/PlayerKD.java

@@ -5,11 +5,13 @@
 import net.azisaba.kdstatusreloaded.playerkd.cache.KDCache;
 import net.azisaba.kdstatusreloaded.playerkd.db.KDDatabase;
 import net.azisaba.kdstatusreloaded.playerkd.listener.PlayerEventListener;
+import org.jspecify.annotations.NullMarked;
 
 import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 
+@NullMarked
 public class PlayerKD {
     private final KDDatabase kdDatabase;
     private final KDCache kdCache;

src/main/java/net/azisaba/kdstatusreloaded/playerkd/db/KDDatabase.java

@@ -6,8 +6,9 @@
 import org.flywaydb.core.Flyway;
 import org.jdbi.v3.core.Jdbi;
 import org.jdbi.v3.sqlobject.SqlObjectPlugin;
-import org.jspecify.annotations.NonNull;
+import org.jspecify.annotations.NullMarked;
 
+@NullMarked
 public class KDDatabase {
     private final HikariDataSource hikariDataSource;
     private Jdbi jdbi;
@@ -43,7 +44,6 @@ public void migration() {
         flyway.migrate();
     }
 
-    @NonNull
     public KDUserDataRepository kdUserDataRepository() {
         if (kdUserDataRepository == null) throw new RuntimeException("KDUserDataRepository was already closed.");
         return kdUserDataRepository;

src/main/java/net/azisaba/kdstatusreloaded/playerkd/listener/PlayerEventListener.java

@@ -11,9 +11,11 @@
 import org.bukkit.event.entity.PlayerDeathEvent;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
+import org.jspecify.annotations.NullMarked;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+@NullMarked
 public class PlayerEventListener implements Listener {
     private static final Logger logger = LoggerFactory.getLogger(PlayerEventListener.class);
     private final KDCache kdCache;

src/main/java/net/azisaba/kdstatusreloaded/playerkd/model/KDUserData.java

@@ -1,8 +1,11 @@
 package net.azisaba.kdstatusreloaded.playerkd.model;
 
+import org.jspecify.annotations.NullMarked;
+
 import java.beans.ConstructorProperties;
 import java.util.UUID;
 
+@NullMarked
 public class KDUserData implements Cloneable {
     public final UUID uuid;
     public String name;

src/main/java/net/azisaba/kdstatusreloaded/utils/Chat.java

@@ -1,9 +1,11 @@
 package net.azisaba.kdstatusreloaded.utils;
 
 import org.bukkit.ChatColor;
+import org.jspecify.annotations.NullMarked;
 
 import java.text.MessageFormat;
 
+@NullMarked
 public class Chat {
 
     // メッセージをフォーマットして、&で色をつける

src/main/java/net/azisaba/kdstatusreloaded/utils/UUIDConverter.java

@@ -1,9 +1,11 @@
 package net.azisaba.kdstatusreloaded.utils;
 
 import org.jspecify.annotations.NonNull;
+import org.jspecify.annotations.NullMarked;
 
 import java.util.UUID;
 
+@NullMarked
 public class UUIDConverter {
 
     public static String convert(@NonNull UUID uuid) {