diff --git a/klanglicht-module-dmx/pom.xml b/klanglicht-module-dmx/pom.xml
index dd4b244..4bae9c2 100644
--- a/klanglicht-module-dmx/pom.xml
+++ b/klanglicht-module-dmx/pom.xml
@@ -27,21 +27,11 @@
     </dependency>
 
     <!-- commons -->
-    <dependency>
-      <groupId>org.apache.commons</groupId>
-      <artifactId>commons-lang3</artifactId>
-      <version>3.12.0</version>
-    </dependency>
     <dependency>
       <groupId>commons-codec</groupId>
       <artifactId>commons-codec</artifactId>
       <version>1.15</version>
     </dependency>
-    <dependency>
-      <groupId>com.google.guava</groupId>
-      <artifactId>guava</artifactId>
-      <version>31.1-jre</version>
-    </dependency>
 
     <!-- jackson -->
     <dependency>
diff --git a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBAColor.kt b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBAColor.kt
index bb0556e..4b9f587 100644
--- a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBAColor.kt
+++ b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBAColor.kt
@@ -1,6 +1,5 @@
 package de.visualdigits.kotlin.klanglicht.model.color
 
-import org.apache.commons.lang3.StringUtils
 import java.lang.Long.decode
 import kotlin.math.min
 import kotlin.math.roundToInt
@@ -28,7 +27,7 @@ class RGBAColor(
     constructor(hex: String) : this(decode(if (hex.startsWith("#") || hex.startsWith("0x")) hex else "#$hex"))
 
     override fun toString(): String {
-        return "[" + StringUtils.join(listOf(red, green, blue, amber), ", ") + "]"
+        return "[" + listOf(red, green, blue, amber).joinToString(", ") + "]"
     }
 
     override fun repr(): String {
@@ -55,7 +54,7 @@ class RGBAColor(
 
     override fun value(): Long = (red.toLong() shl 24) or (green.toLong() shl 16) or (blue.toLong() shl 8) or amber.toLong()
 
-    override fun hex(): String = StringUtils.leftPad(java.lang.Long.toHexString(value()), 8, '0')
+    override fun hex(): String = java.lang.Long.toHexString(value()).padStart(8, '0')
 
     override fun web(): String = "#${hex()}"
 
diff --git a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBBaseColor.kt b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBBaseColor.kt
index 3230af0..ac7f49a 100644
--- a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBBaseColor.kt
+++ b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBBaseColor.kt
@@ -1,6 +1,5 @@
 package de.visualdigits.kotlin.klanglicht.model.color
 
-import org.apache.commons.lang3.StringUtils
 import java.lang.Long.decode
 import java.lang.Long.toHexString
 import kotlin.math.max
@@ -23,7 +22,7 @@ abstract class RGBBaseColor<T : RGBBaseColor<T>>(
     constructor(hex: String) : this(decode(if (hex.startsWith("#") || hex.startsWith("0x")) hex else "#$hex"))
 
     override fun toString(): String {
-        return "[" + StringUtils.join(listOf(red, green, blue), ", ") + "]"
+        return "[" + listOf(red, green, blue).joinToString(", ") + "]"
     }
 
     open fun repr(): String {
@@ -50,7 +49,7 @@ abstract class RGBBaseColor<T : RGBBaseColor<T>>(
 
     override fun value(): Long = red.toLong() shl 16 or (green.toLong() shl 8) or blue.toLong()
 
-    override fun hex(): String = StringUtils.leftPad(toHexString(value()), 6, '0')
+    override fun hex(): String = toHexString(value()).padStart( 6, '0')
 
     override fun web(): String = "#${hex()}"
 
diff --git a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBWAColor.kt b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBWAColor.kt
index e9e788d..339f9cf 100644
--- a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBWAColor.kt
+++ b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBWAColor.kt
@@ -1,7 +1,7 @@
 package de.visualdigits.kotlin.klanglicht.model.color
 
-import org.apache.commons.lang3.StringUtils
 import java.lang.Long.decode
+import java.lang.Long.toHexString
 import kotlin.math.min
 import kotlin.math.roundToInt
 
@@ -24,7 +24,7 @@ class RGBWAColor(
     constructor(hex: String) : this(decode(if (hex.startsWith("#") || hex.startsWith("0x")) hex else "#$hex"))
 
     override fun toString(): String {
-        return "[" + StringUtils.join(listOf(red, green, blue, white, amber), ", ") + "]"
+        return "[" +listOf(red, green, blue, white, amber).joinToString(", ") + "]"
     }
 
     override fun repr(): String {
@@ -53,7 +53,7 @@ class RGBWAColor(
 
     override fun value(): Long = (red.toLong() shl 32) or (green.toLong() shl 24) or (blue.toLong() shl 16) or (white.toLong() shl 8) or amber.toLong()
 
-    override fun hex(): String = StringUtils.leftPad(java.lang.Long.toHexString(value()), 10, '0')
+    override fun hex(): String = toHexString(value()).padStart( 10, '0')
 
     override fun web(): String = "#${hex()}"
 
diff --git a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBWColor.kt b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBWColor.kt
index 8f1447e..f787b40 100644
--- a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBWColor.kt
+++ b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/color/RGBWColor.kt
@@ -1,7 +1,7 @@
 package de.visualdigits.kotlin.klanglicht.model.color
 
-import org.apache.commons.lang3.StringUtils
 import java.lang.Long.decode
+import java.lang.Long.toHexString
 import kotlin.math.min
 import kotlin.math.roundToInt
 
@@ -31,7 +31,7 @@ class RGBWColor(
     }
 
     override fun toString(): String {
-        return "[" + StringUtils.join(listOf(red, green, blue, white), ", ") + "]"
+        return "[" + listOf(red, green, blue, white).joinToString(", ") + "]"
     }
 
     override fun repr(): String {
@@ -58,7 +58,7 @@ class RGBWColor(
 
     override fun value(): Long = (red.toLong() shl 24) or (green.toLong() shl 16) or (blue.toLong() shl 8) or white.toLong()
 
-    override fun hex(): String = StringUtils.leftPad(java.lang.Long.toHexString(value()), 8, '0')
+    override fun hex(): String = toHexString(value()).padStart(8, '0')
 
     override fun web(): String = "#${hex()}"
 
diff --git a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/dmx/DmxFrame.kt b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/dmx/DmxFrame.kt
index 05ddc88..3cb3381 100644
--- a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/dmx/DmxFrame.kt
+++ b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/dmx/DmxFrame.kt
@@ -1,7 +1,6 @@
 package de.visualdigits.kotlin.klanglicht.model.dmx
 
-import com.google.common.primitives.Bytes
-import org.apache.commons.lang3.StringUtils
+import java.lang.Integer.toHexString
 import java.util.Arrays
 
 
@@ -38,7 +37,7 @@ class DmxFrame(
     /**
      * Returns the bytes for a complete frame including header and footer.
      */
-    fun getFrameBytes(): ByteArray = Bytes.concat(header, data, footer)
+    fun getFrameBytes(): ByteArray = header + data + footer
 
     /**
      * Sets all data bytes to 0.
@@ -58,9 +57,9 @@ class DmxFrame(
     fun dump(): String {
         val l: MutableList<String> = ArrayList()
         for (b in data) {
-            l.add("0x" + StringUtils.leftPad(Integer.toHexString(b.toInt() and 0xff), 2, '0'))
+            l.add("0x" + toHexString(b.toInt() and 0xff).padStart( 2, '0'))
         }
-        return StringUtils.join(l, ", ")
+        return l.joinToString(", ")
     }
 
     fun clear() {
diff --git a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/dmx/DmxInterface.kt b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/dmx/DmxInterface.kt
index 80578e5..371985b 100644
--- a/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/dmx/DmxInterface.kt
+++ b/klanglicht-module-dmx/src/main/kotlin/de/visualdigits/kotlin/klanglicht/model/dmx/DmxInterface.kt
@@ -2,7 +2,7 @@ package de.visualdigits.kotlin.klanglicht.model.dmx
 
 import jssc.SerialPort
 import jssc.SerialPortException
-import org.apache.commons.lang3.StringUtils
+import java.lang.Integer.toHexString
 
 
 open class DmxInterface {
@@ -28,7 +28,7 @@ open class DmxInterface {
     fun repr(): String {
         val lst = ArrayList<String>()
         for (b in dmxFrame.getFrameBytes()) {
-            lst.add(StringUtils.leftPad(Integer.toHexString(b.toInt()), 8, '0'))
+            lst.add(toHexString(b.toInt()).padStart( 8, '0'))
         }
         return lst.toString()
     }
@@ -39,7 +39,7 @@ open class DmxInterface {
      * @param portName The port name (i.e. 'COM9'.
      */
     open fun open(portName: String) {
-        if (serialPort == null && !StringUtils.isEmpty(portName)) {
+        if (serialPort == null && portName.isNotEmpty()) {
             try {
                 serialPort = SerialPort(portName)
                 serialPort?.openPort()
diff --git a/klanglicht-module-dmx/src/test/kotlin/de/visualdigits/kotlin/klanglicht/model/hybrid/HybridDmxSceneTest.kt b/klanglicht-module-dmx/src/test/kotlin/de/visualdigits/kotlin/klanglicht/model/hybrid/HybridDmxSceneTest.kt
index 6fd4521..e424d47 100644
--- a/klanglicht-module-dmx/src/test/kotlin/de/visualdigits/kotlin/klanglicht/model/hybrid/HybridDmxSceneTest.kt
+++ b/klanglicht-module-dmx/src/test/kotlin/de/visualdigits/kotlin/klanglicht/model/hybrid/HybridDmxSceneTest.kt
@@ -1,7 +1,7 @@
 package de.visualdigits.kotlin.klanglicht.model.hybrid
 
 import de.visualdigits.kotlin.klanglicht.model.preferences.Preferences
-import org.apache.commons.lang3.SystemUtils
+import de.visualdigits.kotlin.util.SystemUtils
 import org.junit.jupiter.api.Disabled
 import org.junit.jupiter.api.Test
 import java.io.File
diff --git a/klanglicht-module-dmx/src/test/kotlin/de/visualdigits/kotlin/klanglicht/model/preferences/PreferencesTest.kt b/klanglicht-module-dmx/src/test/kotlin/de/visualdigits/kotlin/klanglicht/model/preferences/PreferencesTest.kt
index 2b5099f..4d9e456 100644
--- a/klanglicht-module-dmx/src/test/kotlin/de/visualdigits/kotlin/klanglicht/model/preferences/PreferencesTest.kt
+++ b/klanglicht-module-dmx/src/test/kotlin/de/visualdigits/kotlin/klanglicht/model/preferences/PreferencesTest.kt
@@ -3,8 +3,6 @@ package de.visualdigits.kotlin.klanglicht.model.preferences
 import com.fasterxml.jackson.databind.SerializationFeature
 import com.fasterxml.jackson.module.kotlin.jacksonMapperBuilder
 import de.visualdigits.kotlin.klanglicht.model.hybrid.HybridScene
-import org.apache.commons.lang3.SystemUtils
-import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertNotNull
 import org.junit.jupiter.api.Test
 import java.io.File
diff --git a/klanglicht-rest/pom.xml b/klanglicht-rest/pom.xml
index 4a56df9..336b9d9 100644
--- a/klanglicht-rest/pom.xml
+++ b/klanglicht-rest/pom.xml
@@ -38,11 +38,11 @@
     </dependency>
 
     <!-- common stuff -->
-    <dependency>
+    <!--dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-text</artifactId>
       <version>1.10.0</version>
-    </dependency>
+    </dependency-->
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-math3</artifactId>
diff --git a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/configuration/ConfigHolder.kt b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/configuration/ConfigHolder.kt
index b36e9cc..ac8f809 100644
--- a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/configuration/ConfigHolder.kt
+++ b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/configuration/ConfigHolder.kt
@@ -3,10 +3,9 @@ package de.visualdigits.kotlin.klanglicht.rest.configuration
 import de.visualdigits.kotlin.klanglicht.model.hybrid.HybridScene
 import de.visualdigits.kotlin.klanglicht.model.parameter.Fadeable
 import de.visualdigits.kotlin.klanglicht.model.preferences.Preferences
+import de.visualdigits.kotlin.util.SystemUtils
 import jakarta.annotation.PostConstruct
 import jakarta.annotation.PreDestroy
-import kotlinx.coroutines.runBlocking
-import org.apache.commons.lang3.SystemUtils
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 import org.springframework.stereotype.Component
diff --git a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/feign/LightmanagerClient.kt b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/feign/LightmanagerClient.kt
index aebb72b..bbda23c 100644
--- a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/feign/LightmanagerClient.kt
+++ b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/feign/LightmanagerClient.kt
@@ -9,7 +9,6 @@ import de.visualdigits.kotlin.klanglicht.rest.lightmanager.model.html.LMScene
 import de.visualdigits.kotlin.klanglicht.rest.lightmanager.model.html.LMScenes
 import de.visualdigits.kotlin.klanglicht.rest.lightmanager.model.html.LMZones
 import jakarta.annotation.PostConstruct
-import org.apache.commons.lang3.StringUtils
 import org.jsoup.Jsoup
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Component
@@ -25,7 +24,7 @@ class LightmanagerClient(
 
     @PostConstruct
     fun initialize() {
-        if (StringUtils.isEmpty(lightmanagerUrl)) {
+        if (lightmanagerUrl?.isEmpty() == true) {
             lightmanagerUrl = configHolder!!.preferences?.getService("lmair")?.url
         }
         client = LightmanagerFeignClient.client(lightmanagerUrl)
@@ -108,8 +107,8 @@ class LightmanagerClient(
                     LMMarker(
                         id = id,
                         name = elem.text(),
-                        colorOff = if (StringUtils.isNotEmpty(colorOff)) colorOff else COLOR_OFF,
-                        colorOn = if (StringUtils.isNotEmpty(colorOn)) colorOn else COLOR_ON,
+                        colorOff = colorOff.ifEmpty { COLOR_OFF },
+                        colorOn = colorOn.ifEmpty { COLOR_ON },
                         state = markerState[id],
                         separate = false,
                         actorId = "",
diff --git a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMActor.kt b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMActor.kt
index 79ad46e..475103c 100644
--- a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMActor.kt
+++ b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMActor.kt
@@ -3,7 +3,6 @@ package de.visualdigits.kotlin.klanglicht.rest.lightmanager.model.html
 import com.fasterxml.jackson.annotation.JsonIgnore
 import de.visualdigits.kotlin.klanglicht.rest.configuration.ConfigHolder
 import de.visualdigits.kotlin.klanglicht.rest.lightmanager.feign.LightmanagerClient
-import org.apache.commons.lang3.StringUtils
 
 class LMActor(
     var id: Int? = null,
@@ -77,18 +76,18 @@ class LMActor(
             colorOn = marker?.colorOn
             isSeparate = marker?.separate
         }
-        else if (!markers.isEmpty()) {
+        else if (markers.isNotEmpty()) {
             hasSeparateMarkers = true
         }
-        if (StringUtils.isEmpty(colorOff)) {
+        if (colorOff?.isEmpty() == true) {
             colorOff =
-                if (StringUtils.isNotEmpty(colorOff)) colorOff else LightmanagerClient.COLOR_OFF
+                colorOff.ifEmpty { LightmanagerClient.COLOR_OFF }
         }
-        if (StringUtils.isEmpty(colorOn)) {
-            colorOn = if (StringUtils.isNotEmpty(colorOn)) colorOn else LightmanagerClient.COLOR_ON
+        if (colorOn?.isEmpty() == true) {
+            colorOn = colorOn.ifEmpty { LightmanagerClient.COLOR_ON }
         }
         val lmRequests = requests.values.toList()
-        if (!lmRequests.isEmpty() && lmRequests.first() is LMDefaultRequest) {
+        if (lmRequests.isNotEmpty() && lmRequests.first() is LMDefaultRequest) {
             if (hasSeparateMarkers == true || isSeparate == true) {
                 sb.append("        <div class=\"double-button\">\n")
                 //                Collections.reverse(lmRequests);
@@ -116,8 +115,7 @@ class LMActor(
             else {
                 val rq0 = lmRequests.first() as LMDefaultRequest
                 val smkState0 = determineSmkState(rq0)
-                var rq: LMRequest? = null
-                rq = if (markerIsOn == true && !smkState0 || markerIsOn != true && smkState0) {
+                val rq: LMRequest? = if (markerIsOn == true && !smkState0 || markerIsOn != true && smkState0) {
                     rq0
                 }
                 else if (lmRequests.size > 1) {
@@ -215,7 +213,7 @@ class LMActor(
 
     fun addMarker(marker: LMMarker?) {
         var markerState = marker?.markerState!!
-        if (StringUtils.isEmpty(markerState)) {
+        if (markerState.isEmpty()) {
             markerState = "unified"
         }
         markers[markerState] = marker
diff --git a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMMarkers.kt b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMMarkers.kt
index c2c67a5..97dc107 100644
--- a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMMarkers.kt
+++ b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMMarkers.kt
@@ -1,7 +1,5 @@
 package de.visualdigits.kotlin.klanglicht.rest.lightmanager.model.html
 
-import org.apache.commons.lang3.StringUtils
-
 class LMMarkers(
     var name: String? = null,
     var markers: MutableMap<Int, LMMarker> = mutableMapOf()
@@ -10,7 +8,7 @@ class LMMarkers(
         val attributes = LMNamedAttributes(marker.name, "separate", "actorId", "state")
         if (attributes.matched()) {
             val name = attributes.name
-            if (StringUtils.isNotEmpty(name)) {
+            if (name?.isNotEmpty() == true) {
                 marker.name = name
             }
             marker.separate = attributes.getOrDefault("separate", "false").toBoolean()
diff --git a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMScene.kt b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMScene.kt
index 636de35..613c3bb 100644
--- a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMScene.kt
+++ b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMScene.kt
@@ -1,7 +1,6 @@
 package de.visualdigits.kotlin.klanglicht.rest.lightmanager.model.html
 
 import de.visualdigits.kotlin.klanglicht.rest.configuration.ConfigHolder
-import org.apache.commons.lang3.StringUtils
 
 
 class LMScene(
@@ -17,7 +16,7 @@ class LMScene(
         val lightmanagerUrl = configHolder.preferences?.getService("lmair")?.url
         val sb = StringBuilder()
         sb.append("      <div class=\"button\"")
-        if (StringUtils.isNotEmpty(color)) {
+        if (color?.isNotEmpty() == true) {
             if (color?.contains(",") == true) {
                 sb.append(" style=\"background: -moz-linear-gradient(left, ")
                     .append(color)
diff --git a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMScenes.kt b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMScenes.kt
index 6b77826..035fe37 100644
--- a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMScenes.kt
+++ b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMScenes.kt
@@ -1,11 +1,11 @@
 package de.visualdigits.kotlin.klanglicht.rest.lightmanager.model.html
 
 import com.fasterxml.jackson.annotation.JsonIgnore
-import com.google.common.collect.LinkedListMultimap
-import com.google.common.collect.Multimap
 import de.visualdigits.kotlin.klanglicht.rest.configuration.ConfigHolder
 import de.visualdigits.kotlin.klanglicht.rest.lightmanager.widgets.ColorWheel
-import org.apache.commons.lang3.StringUtils
+import org.springframework.util.LinkedMultiValueMap
+import org.springframework.util.MultiValueMap
+import java.util.Locale
 import java.util.TreeMap
 import java.util.function.Consumer
 
@@ -15,23 +15,25 @@ class LMScenes(
     val COLOR_WHEEL_GROUPS: List<String> = mutableListOf("Dmx", "Deko", "Rgbw", "Bar", "Starwars")
 
     @JsonIgnore
-    val scenes: Multimap<String, LMScene> = LinkedListMultimap.create<String, LMScene>()
+    val scenes: MultiValueMap<String, LMScene> = LinkedMultiValueMap()
+
     fun add(scene: LMScene) {
         var group: String? = "common"
         val attributes = LMNamedAttributes(scene.name, "group", "color")
         if (attributes.matched()) {
             val name = attributes.name
-            if (StringUtils.isNotEmpty(name)) {
+            if (name?.isNotEmpty() == true) {
                 scene.name = name
             }
             val g = attributes["group"]
-            if (StringUtils.isNotEmpty(g)) {
+            if (g.isNotEmpty()) {
                 group = g
             }
             scene.color = attributes["color"]
         }
         if ("hidden" != group) {
-            scenes.put(StringUtils.capitalize(group), scene)
+            group?.replaceFirstChar { if (it.isLowerCase()) it.titlecase(Locale.getDefault()) else it.toString() }
+                ?.let { scenes.add(it, scene) }
         }
     }
 
@@ -52,8 +54,8 @@ class LMScenes(
 
         sb.append("<div class=\"category\">\n")
         renderLabel(sb, "S C E N E S")
-        val scenesMap: Map<String, Collection<LMScene>> = TreeMap<String, Collection<LMScene>>(scenes.asMap())
-        scenesMap.forEach { (group: String, groupScenes: Collection<LMScene>) ->
+        val scenesMap: Map<String, List<LMScene>> = TreeMap<String, List<LMScene>>(scenes.toMap())
+        scenesMap.forEach { (group: String, groupScenes: List<LMScene>) ->
             renderScenesGroup(
                 sb,
                 configHolder,
@@ -88,7 +90,7 @@ class LMScenes(
         sb: StringBuilder,
         configHolder: ConfigHolder,
         group: String,
-        groupScenes: Collection<LMScene>
+        groupScenes: List<LMScene>
     ) {
         val hasColorWheel = COLOR_WHEEL_GROUPS.contains(group)
         sb.append("  <div class=\"group")
diff --git a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMZones.kt b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMZones.kt
index f9123b1..79307b9 100644
--- a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMZones.kt
+++ b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMZones.kt
@@ -1,7 +1,6 @@
 package de.visualdigits.kotlin.klanglicht.rest.lightmanager.model.html
 
 import de.visualdigits.kotlin.klanglicht.rest.configuration.ConfigHolder
-import org.apache.commons.lang3.StringUtils
 import org.jsoup.nodes.Element
 import java.io.UnsupportedEncodingException
 import java.net.URLDecoder
@@ -42,11 +41,11 @@ class LMZones(
         actor.id = aid
         val actorOff: String = actorElem.attr("data-aoff")
         var colorOff =
-            if (StringUtils.isNotEmpty(actorOff)) actorOff.split(",".toRegex()).dropLastWhile { it.isEmpty() }
+            if (actorOff.isNotEmpty()) actorOff.split(",".toRegex()).dropLastWhile { it.isEmpty() }
                 .toTypedArray()[1].trim { it <= ' ' }
             else ""
         val actorOn: String = actorElem.attr("data-aon")
-        val colorOn = if (StringUtils.isNotEmpty(actorOn)) actorOn.split(",".toRegex()).dropLastWhile { it.isEmpty() }
+        val colorOn = if (actorOn.isNotEmpty()) actorOn.split(",".toRegex()).dropLastWhile { it.isEmpty() }
             .toTypedArray()[1].trim { it <= ' ' }
         else ""
         var name = actorElem.child(0).text()
@@ -59,7 +58,7 @@ class LMZones(
         actor.colorOn = colorOn
         actor.name = name
         val dataMarker: String = actorElem.attr("data-marker")
-        if (StringUtils.isNotEmpty(dataMarker)) {
+        if (dataMarker.isNotEmpty()) {
             val mid = dataMarker.toInt()
             val marker = markers[mid]
             actor.addMarker(marker)
diff --git a/klanglicht-rest/src/test/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/feign/LightmanagerClientTest.kt b/klanglicht-rest/src/test/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/feign/LightmanagerClientTest.kt
new file mode 100644
index 0000000..251c13d
--- /dev/null
+++ b/klanglicht-rest/src/test/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/feign/LightmanagerClientTest.kt
@@ -0,0 +1,11 @@
+package de.visualdigits.kotlin.klanglicht.rest.lightmanager.feign
+
+import org.junit.jupiter.api.Test
+
+class LightmanagerClientTest {
+
+    @Test
+    fun testScenes() {
+        LightmanagerClient()
+    }
+}