Auto find serial port, script problem

Projects Interfacing w/ Software on the Computer
1

Hi
I have been working on this for a couple of days now and cant figure it out
I´m constantly sending out data by the arduino serial port.
this is what i have got so far:

import processing.serial.;
import cc.arduino.;

Serial Port;
int i = 0;
int c = 0;
int spnr = Serial.list().length;

void setup() {
println(Serial.list());
println("Serial Port nr = " + spnr);
Port = new Serial(this, Serial.list()

, 115200);
}

void draw() {
  if (i > spnr) {
      println("Cant fined a connection");
      Port.clear();
      Port.stop(); 
      } 
      
   println("Testing port " + Serial.list()[c]);
   i++;
   delay(2000);

   
    if (Port.available() > 0) {
      Port.clear();
      Port.stop();
      println("Found");
      println(Port);
      
    } else {
      c++;
    }
}


If i use the bluetooth connection to the arduino I get this error directly:

gnu.io.PortInUseException: Unknown Application
	at gnu.io.CommPortIdentifier.open(CommPortIdentifier.java:354)
	at processing.serial.Serial.<init>(Serial.java:139)
	at processing.serial.Serial.<init>(Serial.java:105)
	at serial_test3.setup(serial_test3.java:34)
	at processing.core.PApplet.handleDraw(PApplet.java:1608)
	at processing.core.PApplet.run(PApplet.java:1530)
	at java.lang.Thread.run(Thread.java:680)
Exception in thread "Animation Thread" java.lang.RuntimeException: Error inside Serial.<init>()
	at processing.serial.Serial.errorMessage(Serial.java:591)
	at processing.serial.Serial.<init>(Serial.java:151)
	at processing.serial.Serial.<init>(Serial.java:105)
	at serial_test3.setup(serial_test3.java:34)
	at processing.core.PApplet.handleDraw(PApplet.java:1608)
	at processing.core.PApplet.run(PApplet.java:1530)
	at java.lang.Thread.run(Thread.java:680)


if I use a USB connection to the ardunio it thinks it found something on the first serial port.
2

You might consider some exception handling. The Processing application is not going to be able to connect to a port that is already in use.

3

How can I tell if a port is used without attempting to connect to it?

4

How can I tell if a port is used without attempting to connect to it?

I don't think you can. You can, though, use a try block around the attempt to connect, and then have a catch block that catches the exception, if one is thrown. The problem you are seeing is that the exception is thrown, but nothing catches it.