Port identification(com1 port)

Help me pl
I am developing an application for rfid in java.In that i am finding the ports in system.(com1..).I am not able to find the ports.It is throwing exception.How to find a port.
my code is,
CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier("COM1");
the exception which i got is,
No port named COM1 foundjavax.comm.NoSuchPortException
javax.comm.NoSuchPortException
at javax.comm.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.ja
at connectPro.main(connectPro.java:40)
Help me pl...

I think you can create a Socket instance yourself.
If it works, then the port was open.
If the constructor fails, the port may have been in use.
What would be nice, especially if you have to work through a firewall, is to have a property file which sets which ports / port range you can use.
Example: 2000 - 2050
Then you use a for loop to run through that range, attempting to open a socket.
To test whether this theory works, you can open a socket, then try opening it again with another socket.... see if it fails.. then you know you have a way to determine if a port is in use or not.
Ps. Steer clear of ports under 1024, as these are "well known ports" and by convention reserved for other applications eg. mail, telnet etc.
regards,
Owen

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