How to get list of available serial ports in my pc using Java? -

i run codes list of available ports n cmputer , returned me false when have 3 com ports free. how solve prob?

my codes:

public static void main(string[] args) {         //serialparameters params=new serialparameters();        // system.out.println(commportidentifier.port_serial );         enumeration portlist = commportidentifier.getportidentifiers();         system.out.println(portlist.hasmoreelements());         while(portlist.hasmoreelements()){             system.out.println("has more elements");              commportidentifier portid = (commportidentifier) portlist.nextelement();                if (portid.getporttype() == commportidentifier.port_parallel) {                     system.out.println(portid.getname());                }                else{                      system.out.println(portid.getname());                }          } } 

output : false

it appears setup of javax.comm api may not correct. make sure have done following:

1. placed comm.jar file in jre/lib/ext directory.
2. placed javax.comm.properties file in jre/lib directory.
3. placed win32com.dll in jre/bin directory.

each of above components "should" available here.