diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectDeserializer.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectDeserializer.kt
index 74076768..f35b0c4f 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectDeserializer.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectDeserializer.kt
@@ -24,7 +24,7 @@ class ObjectDeserializer : JsonDeserializer<Object>() {
                     ExtendedActivityVocabulary.values().firstOrNull { it.name.equals(jsonNode.asText(), true) }
                 }
             } else if (type.isValueNode) {
-                ExtendedActivityVocabulary.values().firstOrNull() { it.name.equals(type.asText(), true) }
+                ExtendedActivityVocabulary.values().firstOrNull { it.name.equals(type.asText(), true) }
             } else {
                 null
             }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeProcessor.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeProcessor.kt
index e230e230..47819d9b 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeProcessor.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeProcessor.kt
@@ -36,7 +36,7 @@ class APLikeProcessor(
 
             val emoji = if (content.startsWith(":")) {
                 val tag = activity.activity.tag
-                (tag.firstOrNull { it is Emoji } as Emoji?)?.let { emojiService.fetchEmoji(it).second }
+                (tag.firstOrNull { it is Emoji } as? Emoji)?.let { emojiService.fetchEmoji(it).second }
             } else {
                 UnicodeEmoji(content)
             }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/common/APResourceResolveServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/common/APResourceResolveServiceImpl.kt
index 246b02d8..05eed6d7 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/common/APResourceResolveServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/common/APResourceResolveServiceImpl.kt
@@ -83,8 +83,6 @@ class APResourceResolveServiceImpl(
             return objects == other.objects
         }
 
-        override fun hashCode(): Int {
-            return objects.hashCode()
-        }
+        override fun hashCode(): Int = objects.hashCode()
     }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/inbox/InboxJobProcessor.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/inbox/InboxJobProcessor.kt
index 2a884ae0..fbe38266 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/inbox/InboxJobProcessor.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/inbox/InboxJobProcessor.kt
@@ -112,7 +112,7 @@ class InboxJobProcessor(
         logger.debug("Is verifying success? {}", verify)
 
         val activityPubProcessor =
-            activityPubProcessorList.firstOrNull { it.isSupported(param.type) } as ActivityPubProcessor<Object>?
+            activityPubProcessorList.firstOrNull { it.isSupported(param.type) } as? ActivityPubProcessor<Object>
 
         if (activityPubProcessor == null) {
             logger.warn("ActivityType {} is not support.", param.type)
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiServiceImpl.kt
index 90a2e1a7..d54f508a 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiServiceImpl.kt
@@ -26,9 +26,7 @@ class EmojiServiceImpl(
         return fetchEmoji(emoji)
     }
 
-    override suspend fun fetchEmoji(emoji: Emoji): Pair<Emoji, CustomEmoji> {
-        return emoji to save(emoji)
-    }
+    override suspend fun fetchEmoji(emoji: Emoji): Pair<Emoji, CustomEmoji> = emoji to save(emoji)
 
     private suspend fun save(emoji: Emoji): CustomEmoji {
         val domain = URL(emoji.id).host
@@ -51,13 +49,13 @@ class EmojiServiceImpl(
         )
 
         val customEmoji1 = CustomEmoji(
-            customEmojiRepository.generateId(),
-            name,
-            domain,
-            instance.id,
-            media.url,
-            null,
-            Instant.now()
+            id = customEmojiRepository.generateId(),
+            name = name,
+            domain = domain,
+            instanceId = instance.id,
+            url = media.url,
+            category = null,
+            createdAt = Instant.now()
         )
 
         return customEmojiRepository.save(customEmoji1)
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/note/APNoteService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/note/APNoteService.kt
index 80e2889e..43d0b7f1 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/note/APNoteService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/note/APNoteService.kt
@@ -113,7 +113,6 @@ class APNoteServiceImpl(
                 it.id
             }
 
-
         val mediaList = note.attachment.map {
             mediaService.uploadRemoteMedia(
                 RemoteMedia(
diff --git a/src/main/kotlin/dev/usbharu/hideout/application/infrastructure/exposed/ExposedTransaction.kt b/src/main/kotlin/dev/usbharu/hideout/application/infrastructure/exposed/ExposedTransaction.kt
index 05fe6305..535375c5 100644
--- a/src/main/kotlin/dev/usbharu/hideout/application/infrastructure/exposed/ExposedTransaction.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/application/infrastructure/exposed/ExposedTransaction.kt
@@ -13,12 +13,6 @@ import java.sql.Connection
 @Service
 class ExposedTransaction : Transaction {
     override suspend fun <T> transaction(block: suspend () -> T): T {
-//        return newSuspendedTransaction(MDCContext(), transactionIsolation = java.sql.Connection.TRANSACTION_READ_COMMITTED) {
-//            warnLongQueriesDuration = 1000
-//            addLogger(Slf4jSqlDebugLogger)
-//            block()
-//        }
-
         return transaction(transactionIsolation = Connection.TRANSACTION_READ_COMMITTED) {
             debug = true
             warnLongQueriesDuration = 1000
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/emoji/CustomEmoji.kt b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/emoji/CustomEmoji.kt
index d02e9103..fb4579aa 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/emoji/CustomEmoji.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/emoji/CustomEmoji.kt
@@ -5,6 +5,8 @@ import java.time.Instant
 sealed class Emoji {
     abstract val domain: String
     abstract val name: String
+
+    @Suppress("FunctionMinLength")
     abstract fun id(): String
     override fun toString(): String {
         return "Emoji(" +
@@ -23,16 +25,12 @@ data class CustomEmoji(
     val category: String?,
     val createdAt: Instant
 ) : Emoji() {
-    override fun id(): String {
-        return id.toString()
-    }
+    override fun id(): String = id.toString()
 }
 
 data class UnicodeEmoji(
     override val name: String
 ) : Emoji() {
     override val domain: String = "unicode.org"
-    override fun id(): String {
-        return name
-    }
+    override fun id(): String = name
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Nodeinfo.kt b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Nodeinfo.kt
index e2e44267..a17fc724 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Nodeinfo.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Nodeinfo.kt
@@ -12,9 +12,7 @@ class Nodeinfo private constructor() {
         return links == other.links
     }
 
-    override fun hashCode(): Int {
-        return links.hashCode()
-    }
+    override fun hashCode(): Int = links.hashCode()
 }
 
 class Links private constructor() {
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/ReactionRepository.kt b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/ReactionRepository.kt
index 4d3964eb..df35e349 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/ReactionRepository.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/ReactionRepository.kt
@@ -4,7 +4,7 @@ import dev.usbharu.hideout.core.domain.model.emoji.Emoji
 import org.springframework.stereotype.Repository
 
 @Repository
-@Suppress("FunctionMaxLength")
+@Suppress("FunctionMaxLength", "TooManyFunction")
 interface ReactionRepository {
     suspend fun generateId(): Long
     suspend fun save(reaction: Reaction): Reaction
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/relationship/RelationshipRepositoryImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/relationship/RelationshipRepositoryImpl.kt
index a8085686..9cea8aaa 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/relationship/RelationshipRepositoryImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/relationship/RelationshipRepositoryImpl.kt
@@ -11,6 +11,9 @@ import org.springframework.stereotype.Service
 
 @Service
 class RelationshipRepositoryImpl : RelationshipRepository, AbstractRepository() {
+    override val logger: Logger
+        get() = Companion.logger
+
     override suspend fun save(relationship: Relationship): Relationship = query {
         val singleOrNull = Relationships.select {
             (Relationships.actorId eq relationship.actorId).and(
@@ -94,9 +97,6 @@ class RelationshipRepositoryImpl : RelationshipRepository, AbstractRepository()
         return@query query.map { it.toRelationships() }
     }
 
-    override val logger: Logger
-        get() = Companion.logger
-
     companion object {
         private val logger = LoggerFactory.getLogger(RelationshipRepositoryImpl::class.java)
     }
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/CustomEmojiRepositoryImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/CustomEmojiRepositoryImpl.kt
index 07c735ff..3310c138 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/CustomEmojiRepositoryImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/CustomEmojiRepositoryImpl.kt
@@ -14,6 +14,9 @@ import org.springframework.stereotype.Repository
 @Repository
 class CustomEmojiRepositoryImpl(private val idGenerateService: IdGenerateService) : CustomEmojiRepository,
     AbstractRepository() {
+    override val logger: Logger
+        get() = Companion.logger
+
     override suspend fun generateId(): Long = idGenerateService.generateId()
 
     override suspend fun save(customEmoji: CustomEmoji): CustomEmoji = query {
@@ -56,22 +59,19 @@ class CustomEmojiRepositoryImpl(private val idGenerateService: IdGenerateService
             ?.toCustomEmoji()
     }
 
-    override val logger: Logger
-        get() = Companion.logger
-
     companion object {
         private val logger = LoggerFactory.getLogger(CustomEmojiRepositoryImpl::class.java)
     }
 }
 
 fun ResultRow.toCustomEmoji(): CustomEmoji = CustomEmoji(
-    this[CustomEmojis.id],
-    this[CustomEmojis.name],
-    this[CustomEmojis.domain],
-    this[CustomEmojis.instanceId],
-    this[CustomEmojis.url],
-    this[CustomEmojis.category],
-    this[CustomEmojis.createdAt]
+    id = this[CustomEmojis.id],
+    name = this[CustomEmojis.name],
+    domain = this[CustomEmojis.domain],
+    instanceId = this[CustomEmojis.instanceId],
+    url = this[CustomEmojis.url],
+    category = this[CustomEmojis.category],
+    createdAt = this[CustomEmojis.createdAt]
 )
 
 fun ResultRow.toCustomEmojiOrNull(): CustomEmoji? {
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ReactionRepositoryImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ReactionRepositoryImpl.kt
index b932a54f..50887de2 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ReactionRepositoryImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ReactionRepositoryImpl.kt
@@ -99,7 +99,6 @@ class ReactionRepositoryImpl(
                     .and(Reactions.unicodeEmoji.eq(emoji.name))
             }
         }
-
     }
 
     override suspend fun findByPostId(postId: Long): List<Reaction> = query {
@@ -147,7 +146,6 @@ class ReactionRepositoryImpl(
                 .and(Reactions.actorId.eq(actorId))
         }
 
-
         if (emoji is UnicodeEmoji) {
             query.andWhere { Reactions.unicodeEmoji eq emoji.name }
         } else {
@@ -178,13 +176,13 @@ class ReactionRepositoryImpl(
 fun ResultRow.toReaction(): Reaction {
     val emoji = if (this[Reactions.customEmojiId] != null) {
         CustomEmoji(
-            this[Reactions.customEmojiId]!!,
-            this[CustomEmojis.name],
-            this[CustomEmojis.domain],
-            this[CustomEmojis.instanceId],
-            this[CustomEmojis.url],
-            this[CustomEmojis.category],
-            this[CustomEmojis.createdAt]
+            id = this[Reactions.customEmojiId]!!,
+            name = this[CustomEmojis.name],
+            domain = this[CustomEmojis.domain],
+            instanceId = this[CustomEmojis.instanceId],
+            url = this[CustomEmojis.url],
+            category = this[CustomEmojis.category],
+            createdAt = this[CustomEmojis.createdAt]
         )
     } else if (this[Reactions.unicodeEmoji] != null) {
         UnicodeEmoji(this[Reactions.unicodeEmoji]!!)
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/oauth2/UserDetailsImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/oauth2/UserDetailsImpl.kt
index cb06f2ce..f41d3fe4 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/oauth2/UserDetailsImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/oauth2/UserDetailsImpl.kt
@@ -26,11 +26,6 @@ class UserDetailsImpl(
     accountNonLocked: Boolean,
     authorities: MutableCollection<out GrantedAuthority>?
 ) : User(username, password, enabled, accountNonExpired, credentialsNonExpired, accountNonLocked, authorities) {
-    companion object {
-        @Serial
-        private const val serialVersionUID: Long = -899168205656607781L
-    }
-
     override fun toString(): String {
         return "UserDetailsImpl(" +
                 "id=$id" +
@@ -53,6 +48,11 @@ class UserDetailsImpl(
         result = 31 * result + id.hashCode()
         return result
     }
+
+    companion object {
+        @Serial
+        private const val serialVersionUID: Long = -899168205656607781L
+    }
 }
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY)
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/service/media/SavedMedia.kt b/src/main/kotlin/dev/usbharu/hideout/core/service/media/SavedMedia.kt
index 50a2caac..7a5eaa1c 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/service/media/SavedMedia.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/service/media/SavedMedia.kt
@@ -10,9 +10,7 @@ sealed class SavedMedia(val success: Boolean) {
         return success == other.success
     }
 
-    override fun hashCode(): Int {
-        return success.hashCode()
-    }
+    override fun hashCode(): Int = success.hashCode()
 }
 
 class SuccessSavedMedia(
diff --git a/src/main/kotlin/dev/usbharu/hideout/mastodon/infrastructure/exposedquery/StatusQueryServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/mastodon/infrastructure/exposedquery/StatusQueryServiceImpl.kt
index 86509c08..e3c47e6e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/mastodon/infrastructure/exposedquery/StatusQueryServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/mastodon/infrastructure/exposedquery/StatusQueryServiceImpl.kt
@@ -161,7 +161,7 @@ class StatusQueryServiceImpl : StatusQueryService {
                     mediaAttachments = it.mapNotNull { resultRow ->
                         resultRow.toMediaOrNull()?.toMediaAttachments()
                     },
-                    emojis = it.mapNotNull { resultRow -> resultRow.toCustomEmoji()?.toMastodonEmoji() }
+                    emojis = it.mapNotNull { resultRow -> resultRow.toCustomEmojiOrNull()?.toMastodonEmoji() }
                 ) to it.first()[Posts.repostId]
             }
         return resolveReplyAndRepost(pairs)
diff --git a/src/main/kotlin/dev/usbharu/hideout/mastodon/interfaces/api/status/MastodonStatusesApiContoller.kt b/src/main/kotlin/dev/usbharu/hideout/mastodon/interfaces/api/status/MastodonStatusesApiContoller.kt
index 6c4a6709..cc6443ce 100644
--- a/src/main/kotlin/dev/usbharu/hideout/mastodon/interfaces/api/status/MastodonStatusesApiContoller.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/mastodon/interfaces/api/status/MastodonStatusesApiContoller.kt
@@ -39,7 +39,5 @@ class MastodonStatusesApiContoller(private val statusesApiService: StatusesApiSe
         return ResponseEntity.ok(statusesApiService.emojiReactions(id.toLong(), uid, emoji))
     }
 
-    override suspend fun apiV1StatusesIdGet(id: String): ResponseEntity<Status> {
-        return super.apiV1StatusesIdGet(id)
-    }
+    override suspend fun apiV1StatusesIdGet(id: String): ResponseEntity<Status> = super.apiV1StatusesIdGet(id)
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/mastodon/service/status/StatusesApiService.kt b/src/main/kotlin/dev/usbharu/hideout/mastodon/service/status/StatusesApiService.kt
index de96e340..563f2059 100644
--- a/src/main/kotlin/dev/usbharu/hideout/mastodon/service/status/StatusesApiService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/mastodon/service/status/StatusesApiService.kt
@@ -49,6 +49,7 @@ interface StatusesApiService {
 }
 
 @Service
+@Suppress("LongParameterList")
 class StatsesApiServiceImpl(
     private val postService: PostService,
     private val accountService: AccountService,
@@ -155,7 +156,6 @@ class StatsesApiServiceImpl(
     }
 
     override suspend fun emojiReactions(postId: Long, userId: Long, emojiName: String): Status? {
-
         status(statusQueryService.findByPostId(postId), userId) ?: return null
 
         val emoji = try {
@@ -164,9 +164,9 @@ class StatsesApiServiceImpl(
             } else {
                 emojiService.findByEmojiName(emojiName)!!
             }
-        } catch (e: IllegalStateException) {
+        } catch (_: IllegalStateException) {
             UnicodeEmoji("❤")
-        } catch (e: NullPointerException) {
+        } catch (_: NullPointerException) {
             UnicodeEmoji("❤")
         }
         reactionService.sendReaction(emoji, userId, postId)
@@ -174,7 +174,6 @@ class StatsesApiServiceImpl(
     }
 
     override suspend fun removeEmojiReactions(postId: Long, userId: Long, emojiName: String): Status? {
-
         reactionService.removeReaction(userId, postId)
 
         return status(statusQueryService.findByPostId(postId), userId)
diff --git a/src/main/kotlin/dev/usbharu/hideout/util/EmojiUtil.kt b/src/main/kotlin/dev/usbharu/hideout/util/EmojiUtil.kt
index 28eda408..4e5c5393 100644
--- a/src/main/kotlin/dev/usbharu/hideout/util/EmojiUtil.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/util/EmojiUtil.kt
@@ -4,15 +4,11 @@ import Emojis
 
 object EmojiUtil {
 
-
     val emojiMap by lazy {
         Emojis.allEmojis
             .associate { it.code.replace(" ", "-") to it.char }
             .filterValues { it != "™" }
-
     }
 
-    fun isEmoji(string: String): Boolean {
-        return emojiMap.any { it.value == string }
-    }
+    fun isEmoji(string: String): Boolean = emojiMap.any { it.value == string }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/util/TempFileUtil.kt b/src/main/kotlin/dev/usbharu/hideout/util/TempFileUtil.kt
index 8a506767..7e57e31e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/util/TempFileUtil.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/util/TempFileUtil.kt
@@ -19,7 +19,5 @@ class TempFile<T : Path?>(val path: T) : AutoCloseable {
         return path == other.path
     }
 
-    override fun hashCode(): Int {
-        return path?.hashCode() ?: 0
-    }
+    override fun hashCode(): Int = path?.hashCode() ?: 0
 }