java - .jar not doing the same thing that in Eclipse -

i created .jar eclipse app. export -> jar file -> choose package + lib -> define main class program use rxtx lib.

here mainframe :

package main;   import gnu.io.commportidentifier; import gnu.io.serialport;  import java.awt.borderlayout; ...  public class mainframe{  public final static string pathlogo1 = "a:/icomssoft/ivt             corporation/bluesoleil/icon-logo.png"; public final static string pathlogo2 = "a:/icomssoft/ivt corporation/bluesoleil/icoms logo.jpg"; public final static string pathbluesoleilicon = "a:/icomssoft/ivt corporation/bluesoleil/bluetoothimage.png"; protected static final jcombobox<string> jb_choixportcom = null;  static jbutton jb_connect; static string choixportcom = null;  //********************************************************************************** //************************ rxtx variable ******************************************* //**********************************************************************************  static commportidentifier serialportid; static enumeration<?> enumcomm; static serialport serialport; static outputstream outputstream; static inputstream inputstream; static boolean serialportcheck = false; static int baudrate = 9600; static int databits = serialport.databits_8; static int stopbits = serialport.stopbits_1; static int parity = serialport.parity_none; jpanel panel = new jpanel (new gridbaglayout()); jpanel panelsetup = new jpanel(new gridbaglayout()); jpanel panelcommunication = new jpanel(new gridbaglayout()); static jcombobox<string> selection = new jcombobox<string>(); jbutton open = new jbutton("open"); jbutton close = new jbutton("close"); jbutton actualise = new jbutton("actualisé"); jbutton envoie = new jbutton("message envoie"); jtextfield message = new jtextfield(); jcheckbox echo = new jcheckbox("echo"); static jtextarea recoit = new jtextarea(); jscrollpane recoitjscrollpane = new jscrollpane();  //********************************************************************************** //********************************************************************************** //**********************************************************************************  public static void fenetreprincipal()  {      final jframe jf_principal = new jframe("icomssoft");     jf_principal.setvisible(true);     jf_principal.setsize(1000,900);     jf_principal.setlocationrelativeto(null);     jf_principal.setresizable(false);      jf_principal.seticonimage(toolkit.getdefaulttoolkit().getimage(pathlogo1));       //******************************************************************************************     //******************************** jpanel north ********************************************     //******************************************************************************************      jpanel jp_north = new jpanel(); // container du borderlayout.north      jp_north.setpreferredsize(new dimension(600,150));      jpanel jp_logo = new jpanel();  // container du jlabel     jp_logo.setbackground(color.white);      jlabel jl_logo = new jlabel(new imageicon(pathlogo2));     jp_logo.add(jl_logo);     jp_north.add(jp_logo);     jp_north.setbackground(color.white);     jp_north.setvisible(true);      //******************************************************************************************     //******************************** jpanel center ********************************************     //******************************************************************************************      final jpanel jp_center = new jpanel();     jp_center.setpreferredsize(new dimension(600,700)); // 900- 600 = 300 left     jp_center.setbackground(color.white);      final jpanel jp_choixconnection = new jpanel();     jp_choixconnection.setborder(borderfactory.createtitledborder("choix connection : "));     jp_choixconnection.setpreferredsize(new dimension(540, 175));     jp_choixconnection.setbackground(color.white);      imageicon pic = new imageicon(pathbluesoleilicon);     jbutton jb_launchbluesoleil = new jbutton(pic);     jb_launchbluesoleil.setpreferredsize(new dimension(100, 135));      jp_choixconnection.add(jb_launchbluesoleil);     jp_center.add(jp_choixconnection);      //******************************************************************************************     //******************************** jpanel south ********************************************     //******************************************************************************************      jpanel jp_south = new jpanel();     jp_south.setbackground(color.white);     jp_south.setpreferredsize(new dimension(600,50));       jpanel jp_bouton = new jpanel();     jp_bouton.setbackground(color.white);      jbutton jb_quit = new jbutton("quitter");     jb_quit.setpreferredsize(new dimension(85, 35));      jp_south.add(jp_bouton);      jp_bouton.add(jb_quit);      jf_principal.getcontentpane().add(jp_north, borderlayout.north);     jf_principal.getcontentpane().add(jp_center, borderlayout.center);     jf_principal.getcontentpane().add(jp_south, borderlayout.south);     jf_principal.setvisible(true);      //******************************************************************************************     //******************************** action listener *****************************************     //******************************************************************************************      jb_launchbluesoleil.addactionlistener(new actionlistener(){         public void actionperformed(actionevent arg0) {              try {                 bluetooth.launch(bluetooth.getpath());                           } catch (ioexception e) {                 e.printstacktrace();             }             string[] listportcom = rxtx.getportcom();              int nbrport = integer.parseint(listportcom[99]);    // string -> int              final jpanel jp_choixportcom = new jpanel();             jp_choixportcom.setborder(borderfactory.createtitledborder("choix port com : "));             jp_choixportcom.setpreferredsize(new dimension(500, 100));             jp_choixportcom.setbackground(color.white);               final jcombobox<string> jb_choixportcom = new jcombobox<string>();             for(int = 0; < nbrport; i++) jb_choixportcom.additem(listportcom[i]);              jb_connect = new jbutton("connect");              jp_choixportcom.add(jb_choixportcom);             jp_choixportcom.add(jb_connect);              jp_center.add(jp_choixportcom);              system.out.println("jp_choixconnection -> bye bye");             jp_choixconnection.setvisible(false);             communicationbt.bt(jp_center);              jb_choixportcom.additemlistener(new itemlistener(){public void itemstatechanged(itemevent e) {                 choixportcom = (string)jb_choixportcom.getselecteditem();                        }});              jb_connect.addactionlistener(new actionlistener(){                 public void actionperformed(actionevent arg0) {                      if (choixportcom.equals(null) == true ) joptionpane.showmessagedialog(null, "choose port com");                     else rxtx.checkport(choixportcom);                 }                   });          }           });      jb_quit.addactionlistener(new actionlistener(){         public void actionperformed(actionevent arg0) {             jf_principal.dispose();         }           }); }  public static void main(string[] args) throws ioexception, interruptedexception {     fenetreprincipal(); } 

}

and here call getportcom :

package main; import gnu.io.*; // rxtx  import java.io.ioexception; import java.io.inputstream; import java.io.outputstream; import java.util.enumeration;  public class rxtx {  static commportidentifier serialportid; static enumeration<?> enumcomm; static serialport serialport; static outputstream outputstream; static inputstream inputstream;  int baudrate = 9600; int databits = serialport.databits_8; int stopbits = serialport.stopbits_1; int parity = serialport.parity_none;  static boolean serialportcheck = false;  public static string[] getportcom(){     string[] list = new string[100]; // list[99] = nbrport     int nbrport = 0;      commportidentifier serialportid;     enumeration<?> enumcomm;       enumcomm = commportidentifier.getportidentifiers();     while (enumcomm.hasmoreelements()) {         serialportid = (commportidentifier) enumcomm.nextelement();         if(serialportid.getporttype() == commportidentifier.port_serial) {             //system.out.println(serialportid.getname());             list[nbrport] = serialportid.getname();             nbrport++;         }          list[99] = integer.tostring(nbrport);   // int -> string      }      (int = 0; < nbrport; i++) {         system.out.println(list[i]);     }      return list; }  public static boolean checkport(string portname){      boolean foundport = false;     if (serialportcheck != false) {         system.out.println("serial port déjà ouvert");         return true;     }     enumcomm = commportidentifier.getportidentifiers();     while(enumcomm.hasmoreelements()) {         serialportid = (commportidentifier) enumcomm.nextelement();         if (portname.contentequals(serialportid.getname())) {             foundport = true;             break;         }     }     if (foundport != true) {         system.out.println("serialport pas trouver: " + portname);         return false;     }     try {         serialport = (serialport) serialportid.open("ouvert + envoie", 500);     } catch (portinuseexception e) {         system.out.println("port -> ok");     }     try {         outputstream = serialport.getoutputstream();     } catch (ioexception e) {         system.out.println("probleme en outputstream");     }     try {         inputstream = serialport.getinputstream();     } catch (ioexception e) {         system.out.println("probleme en inputstream");     }     serialportcheck = true;     return true; } 

the thing don't understand why works in eclipse not jar, path correct don't :/

more information :

so app call program(bluesoleil) when click on button. problem .jar, when click on button program launchs correctly block there rest doesn't appear. suppose change jp_center (jpanel) switching jpanel -> launch getportcom , create jcombobox portcom available.