I get the error: 'java.lang.BootstrapMethodError: Exception from call site #0 bootstrap method' whenever I call this line in Android with SignalR
hubConnection = HubConnectionBuilder.create("http://192.168.137.1:5000/movehub").build();
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
hubConnection = HubConnectionBuilder.create("http://192.168.137.1:5000/movehub").build();
btnConnect.setOnClickListener {
if (btnConnect.text.toString() == "Connect") {
if (hubConnection.connectionState == HubConnectionState.DISCONNECTED) {
hubConnection.start()
btnConnect.text = "Disconnect"
}
} else if (btnConnect.text.toString() == "Disconnect") {
if (hubConnection.connectionState == HubConnectionState.CONNECTED) {
hubConnection.stop()
btnConnect.text = "Connect"
}
}
}
This is in my gradle:
implementation 'com.microsoft.signalr:signalr:3.0.0'
I get the same error even if I use
implementation 'com.microsoft.signalr:signalr:1.0.0'
Please see the whole error:
Process: com.tryouts.androidclient, PID: 22480
java.lang.BootstrapMethodError: Exception from call site #0 bootstrap method
at com.microsoft.signalr.HubConnection.<init>(HubConnection.java:159)
at com.microsoft.signalr.HttpHubConnectionBuilder.build(HttpHubConnectionBuilder.java:122)
at com.tryouts.androidclient.MainActivity.onCreate(MainActivity.kt:18)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.ClassCastException: Bootstrap method returned null
at com.microsoft.signalr.HubConnection.<init>(HubConnection.java:159)
at com.microsoft.signalr.HttpHubConnectionBuilder.build(HttpHubConnectionBuilder.java:122)
at com.tryouts.androidclient.MainActivity.onCreate(MainActivity.kt:18)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
