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В данный момент я пытаюсь реализовать клиент CometD в мультиплатформенном приложении Kotlin для Android.

Вот мои зависимости от Android

 val androidMain by getting {  dependencies {  implementation("org.cometd.java:cometd-java-client-websocket-okhttp:7.0.5")  implementation("org.cometd.java:cometd-java-client-websocket-javax:7.0.5")  } }  

Мой код (CometdConnection.kt)

 package com.roxorgaming.kotlinheadlessspike  import jakarta.websocket.ContainerProvider import org.cometd.client.BayeuxClient import org.cometd.client.websocket.javax.WebSocketTransport import org.cometd.client.transport.ClientTransport   actual class CometdConnection actual constructor() {  private lateinit var bayeuxClient: BayeuxClient   actual fun initialise() {  // Prepare the JSR 356 WebSocket transport.  // Create a JSR 356 WebSocketContainer using the standard APIs.  val webSocketContainer = ContainerProvider.getWebSocketContainer() //lt;--- this is where it fails  // Create the CometD JSR 356 websocket transport.  val wsTransport: ClientTransport = WebSocketTransport(null, null, webSocketContainer)   // Configure BayeuxClient, with the websocket transport listed before the long-polling transport.  bayeuxClient = BayeuxClient("http://localhost:8080/cometd", wsTransport)  }   actual fun handshake() {  // Handshake with the server.  bayeuxClient.handshake()  } }  

Приложение компилируется, но вылетает при сбое инициализации с ошибкой

 2021-12-06 11:18:09.234 19121-19121/com.roxorgaming.kotlinheadlessspike.android E/AndroidRuntime: FATAL EXCEPTION: main  Process: com.roxorgaming.kotlinheadlessspike.android, PID: 19121  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.roxorgaming.kotlinheadlessspike.android/com.roxorgaming.kotlinheadlessspike.android.MainActivity}: java.lang.RuntimeException: Could not find an implementation class.  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)  at android.os.Handler.dispatchMessage(Handler.java:106)  at android.os.Looper.loop(Looper.java:223)  at android.app.ActivityThread.main(ActivityThread.java:7656)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)  Caused by: java.lang.RuntimeException: Could not find an implementation class.  at jakarta.websocket.ContainerProvider.getWebSocketContainer(ContainerProvider.java:54)  at com.roxorgaming.kotlinheadlessspike.CometdConnection.initialise(CometdConnection.kt:16)  at com.roxorgaming.kotlinheadlessspike.android.MainActivity.onCreate(MainActivity.kt:20)  at android.app.Activity.performCreate(Activity.java:7994)  at android.app.Activity.performCreate(Activity.java:7978)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)  

Вам не нужна зависимость org.cometd.java:cometd-java-client-websocket-javax:7.0.5 , потому что она у вас уже есть org.cometd.java:cometd-java-client-websocket-okhttp:7.0.5 .

Удалите его, и ошибка должна исчезнуть.