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The presigned websocket url is something like this

wss://<host>.eu-west-1.amazonaws.com:443/mqtt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=<cred>/eu-west-1/iotdevicegateway/aws4_request&X-Amz-Date=20250814T085431Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=<signature>&X-Amz-Security-Token=<token>

And here is my code

        AwsIotMqttConnectionBuilder builder = AwsIotMqttConnectionBuilder.newMtlsBuilderFromPath(null, null)
                .withWebsockets(true) // Crucial for presigned URL connections
                .withEndpoint(connectionUrl) // Pass the presigned URL here
                .withClientId(clientId)
                .withConnectionEventCallbacks(callbacks)
                .withWebsocketSigningRegion("eu-west-1")
                .withPort(443); // Default WebSocket port

        MqttClientConnection connection = builder.build();

        // Connect to AWS IoT Core
        CompletableFuture<Boolean> connected = connection.connect();
        connected.get(); // Wait for connection to complete

I'm getting following error when I run the code

java.util.concurrent.ExecutionException: software.amazon.awssdk.crt.mqtt.MqttException: Attempt to sign an http request without credentials

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