title: Cometd with Android: java.lang.RuntimeException: Could not find an implementation class
body: <p>I am trying to implement a cometD client in a Kotlin Multiplatform App for android at the moment.</p>
  <h2>Here are my android dependencies</h2>
  <pre><code>val androidMain by getting {
      dependencies {
          implementation(&quot;org.cometd.java:cometd-java-client-websocket-okhttp:7.0.5&quot;)
          implementation(&quot;org.cometd.java:cometd-java-client-websocket-javax:7.0.5&quot;)
      }
  }
  </code></pre>
  <h2>My code (CometdConnection.kt)</h2>
  <pre><code>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(&quot;http://localhost:8080/cometd&quot;, wsTransport)
      }
  
      actual fun handshake() {
          // Handshake with the server.
          bayeuxClient.handshake()
      }
  }
  </code></pre>
  <p>The app gets compiled but crashes when the initialization fails with an error</p>
  <pre><code>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)
  </code></pre>