I am developing a BluetoothServer using Raspberry, bluecove-2.1.0.jar
java version "1.8.0_06"
Java(TM) SE Runtime Environment (build 1.8.0_06-b23)
Java HotSpot(TM) Client VM (build 25.6-b23, mixed mode)
Here the server java code:
public class BluetoothServer extends Thread {
UUID uuid = new UUID("0000110100001000800000805F9B34FB", false); // This is a magic number
String url = "btspp://localhost:" + uuid.toString() + ";name=xxxx";
Security security = new Security();
/** Constructor */
public BluetoothServer() {
}
@Override
public void run() {
waitForConnection();
}
/** Waiting for connection from devices */
private void waitForConnection() {
// retrieve the local Bluetooth device object
LocalDevice local = null;
StreamConnectionNotifier notifier = null;
StreamConnection connection = null;
// setup the server to listen for connection
try {
local = LocalDevice.getLocalDevice();
local.setDiscoverable(DiscoveryAgent.GIAC); // generally discoverable, discoveryTimeout should be disabled - but isn't.
notifier = (StreamConnectionNotifier) Connector.open(url);
// Bluetooth may go undiscoverable after 180sec default discoveryTimeout, so reset it on separate thread every 179sec.
new Timer().schedule(new TimerTask(){
@Override
public void run() {
try {
LocalDevice.getLocalDevice().setDiscoverable(DiscoveryAgent.GIAC);
} catch (BluetoothStateException e) {
System.out.println("TimerTask exception: " + e.getMessage());
e.printStackTrace();
}
}
}, 0, 179000);
} catch (Exception e) {
System.out.println("Server exception: " + e.getMessage());
e.printStackTrace();
}
// waiting for connection
while (true) {
try {
System.out.println("waiting for connection...");
connection = notifier.acceptAndOpen();
Thread processThread = new Thread(new ProcessConnectionThread(
connection, this));
processThread.start();
System.out.println("processThread.started...");
// bluetooth may have been set undiscoverable after connection
local.setDiscoverable(DiscoveryAgent.GIAC);
} catch (Exception e) {
System.out.println("Server exception: " + e.getMessage());
e.printStackTrace();
return;
}
}
}
public static void main(String[] args) {
System.out.println("Server startup now");
new BluetoothServer().start();
}
public Security getSecurity() {
return security;
}
}
When I Start the server on the command line:
sudo java -cp /jars:/jars/bluetoothserver.jar:/jars/bluecove-2.1.0.jar:/jars/pi4j-core.jar com.bluetoothserver.BluetoothServer
I get this error:
BlueCove version 2.1.0 on bluez
Server exception: The connection implementation for btspp cannot be found.
javax.microedition.io.ConnectionNotFoundException: The connection implementation for btspp cannot be found.
at javax.microedition.io.Connector.open(Connector.java:238)
at javax.microedition.io.Connector.open(Connector.java:181)
at javax.microedition.io.Connector.open(Connector.java:162)
at com.bluetoothserver.BluetoothServer.waitForConnection(BluetoothServer.java:56)
at com.bluetoothserver.BluetoothServer.run(BluetoothServer.java:32)
waiting for connection...
Server exception: null
java.lang.NullPointerException
at com.bluetoothserver.BluetoothServer.waitForConnection(BluetoothServer.java:87)
at com.bluetoothserver.BluetoothServer.run(BluetoothServer.java:32)
Any ideas ? Thanks
Had the same issue. JDK 1.8.0_06 has the implementation of javax.microedition.io.Connector in it's rt.jar. In my case the solution was to remove javax.microedition package from rt.jar to use BlueCove implementation.