diff --git a/scalabot-app/src/main/java/net/lamgc/scalabot/util/ByteUtils.java b/scalabot-app/src/main/java/net/lamgc/scalabot/util/ByteUtils.java
deleted file mode 100644
index 3888fdf..0000000
--- a/scalabot-app/src/main/java/net/lamgc/scalabot/util/ByteUtils.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package net.lamgc.scalabot.util;
-
-final class ByteUtils {
-
-    private ByteUtils() {
-    }
-
-    public static String bytesToHexString(byte[] bytes) {
-        StringBuilder builder = new StringBuilder();
-        for (byte aByte : bytes) {
-            String hexBit = Integer.toHexString(aByte & 0xFF);
-            builder.append(hexBit.length() == 1 ? "0" + hexBit : hexBit);
-        }
-        return builder.toString();
-    }
-
-}
diff --git a/scalabot-app/src/main/kotlin/BotDBMaker.kt b/scalabot-app/src/main/kotlin/BotDBMaker.kt
index 09f8ca2..bdea555 100644
--- a/scalabot-app/src/main/kotlin/BotDBMaker.kt
+++ b/scalabot-app/src/main/kotlin/BotDBMaker.kt
@@ -2,7 +2,7 @@ package net.lamgc.scalabot
 
 import com.google.common.io.Files
 import mu.KotlinLogging
-import net.lamgc.scalabot.util.toHaxString
+import net.lamgc.scalabot.util.toHexString
 import org.mapdb.DB
 import org.mapdb.DBException
 import org.mapdb.DBMaker
@@ -186,5 +186,5 @@ private object BotAccountIdDbAdapter : FileDbAdapter("BotAccountId", { botAccoun
 private object BotTokenDbAdapter : FileDbAdapter("BotToken_v0.1.0", { botAccount ->
     val digest: MessageDigest = MessageDigest.getInstance("SHA-256")
     val digestBytes = digest.digest(botAccount.token.toByteArray(StandardCharsets.UTF_8))
-    File(AppPaths.DATA_DB.file, "${digestBytes.toHaxString()}.db")
+    File(AppPaths.DATA_DB.file, "${digestBytes.toHexString()}.db")
 })
\ No newline at end of file
diff --git a/scalabot-app/src/main/kotlin/util/Utils.kt b/scalabot-app/src/main/kotlin/util/Utils.kt
index 5504f1d..0d74fd0 100644
--- a/scalabot-app/src/main/kotlin/util/Utils.kt
+++ b/scalabot-app/src/main/kotlin/util/Utils.kt
@@ -9,7 +9,7 @@ import java.io.FileFilter
 import java.io.FilenameFilter
 import java.net.URL
 
-internal fun ByteArray.toHaxString(): String = ByteUtils.bytesToHexString(this)
+internal fun ByteArray.toHexString(): String = joinToString("") { it.toString(16) }
 
 internal fun Artifact.equalsArtifact(that: Artifact): Boolean =
     this.groupId.equals(that.groupId) &&
diff --git a/scalabot-app/src/test/kotlin/util/UtilsKtTest.kt b/scalabot-app/src/test/kotlin/util/UtilsKtTest.kt
index 84e0fbb..d9934a1 100644
--- a/scalabot-app/src/test/kotlin/util/UtilsKtTest.kt
+++ b/scalabot-app/src/test/kotlin/util/UtilsKtTest.kt
@@ -1,9 +1,9 @@
 package net.lamgc.scalabot.util
 
 import org.eclipse.aether.artifact.DefaultArtifact
-import org.junit.jupiter.api.Assertions.assertFalse
-import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
+import java.nio.charset.StandardCharsets
 
 internal class UtilsKtTest {
 
@@ -16,4 +16,10 @@ internal class UtilsKtTest {
                 .equalsArtifact(DefaultArtifact("com.example:demo-2:1.0.0-SNAPSHOT"))
         )
     }
+
+    @Test
+    fun `bytes to hex`() {
+        assertEquals("48656c6c6f20576f726c64", "Hello World".toByteArray(StandardCharsets.UTF_8).toHexString())
+    }
+
 }
\ No newline at end of file