diff --git a/src/main/java/me/chayapak1/chomens_bot/Main.java b/src/main/java/me/chayapak1/chomens_bot/Main.java
index e5a8d02a..8596f2e7 100644
--- a/src/main/java/me/chayapak1/chomens_bot/Main.java
+++ b/src/main/java/me/chayapak1/chomens_bot/Main.java
@@ -7,7 +7,6 @@ import me.chayapak1.chomens_bot.plugins.IRCPlugin;
 import me.chayapak1.chomens_bot.plugins.LoggerPlugin;
 import me.chayapak1.chomens_bot.util.*;
 import net.dv8tion.jda.api.requests.restaction.MessageCreateAction;
-import net.kyori.adventure.text.Component;
 import org.yaml.snakeyaml.LoaderOptions;
 import org.yaml.snakeyaml.Yaml;
 import org.yaml.snakeyaml.constructor.Constructor;
@@ -20,7 +19,6 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
diff --git a/src/main/java/me/chayapak1/chomens_bot/song/NBSConverter.java b/src/main/java/me/chayapak1/chomens_bot/song/NBSConverter.java
index c606f4dc..02a5599e 100644
--- a/src/main/java/me/chayapak1/chomens_bot/song/NBSConverter.java
+++ b/src/main/java/me/chayapak1/chomens_bot/song/NBSConverter.java
@@ -285,7 +285,7 @@ public class NBSConverter implements Converter {
     }
   }
 
-  private static List<String> sounds = loadJsonStringArray("sounds.json");
+  private static final List<String> sounds = loadJsonStringArray("sounds.json");
 
   private static List<String> loadJsonStringArray (String name) {
     List<String> list = new ArrayList<>();
diff --git a/src/main/java/me/chayapak1/chomens_bot/song/SongPlayerConverter.java b/src/main/java/me/chayapak1/chomens_bot/song/SongPlayerConverter.java
index 778a38b0..55203b37 100644
--- a/src/main/java/me/chayapak1/chomens_bot/song/SongPlayerConverter.java
+++ b/src/main/java/me/chayapak1/chomens_bot/song/SongPlayerConverter.java
@@ -1,6 +1,7 @@
 package me.chayapak1.chomens_bot.song;
 
 import me.chayapak1.chomens_bot.Bot;
+import org.jetbrains.annotations.NotNull;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
@@ -107,12 +108,12 @@ public class SongPlayerConverter implements Converter {
         }
 
         @Override
-        public int read(byte b[]) throws IOException {
+        public int read(byte @NotNull [] b) throws IOException {
             return read(b, 0, b.length);
         }
 
         @Override
-        public int read(byte b[], int off, int len) throws IOException {
+        public int read(byte @NotNull [] b, int off, int len) throws IOException {
             int i = original.read(b, off, len);
             if (i>=0) incrementCounter(i);
             return i;
diff --git a/src/main/java/me/chayapak1/chomens_bot/voiceChat/mic/JavaOpusEncoder.java b/src/main/java/me/chayapak1/chomens_bot/voiceChat/mic/JavaOpusEncoder.java
index 0be126b8..85f43d59 100644
--- a/src/main/java/me/chayapak1/chomens_bot/voiceChat/mic/JavaOpusEncoder.java
+++ b/src/main/java/me/chayapak1/chomens_bot/voiceChat/mic/JavaOpusEncoder.java
@@ -70,9 +70,9 @@ public class JavaOpusEncoder {
 
     public static OpusApplication getApplication(de.maxhenkel.opus4j.OpusEncoder.Application application) {
         return switch (application) {
-            default -> OpusApplication.OPUS_APPLICATION_VOIP;
             case AUDIO -> OpusApplication.OPUS_APPLICATION_AUDIO;
             case LOW_DELAY -> OpusApplication.OPUS_APPLICATION_RESTRICTED_LOWDELAY;
+            default -> OpusApplication.OPUS_APPLICATION_VOIP;
         };
     }
 }