java - program works in eclipse but not after exported into a jar file -

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i wrote program gets input device , displays on jpanel numbers according input when export file wouldnt show -as if doesnt start here sample code:

main:

public class main1 {  static commportidentifier portid; static enumeration portlist;   public static void main(string[] args) {           portlist=commportidentifier.getportidentifiers();           while (portlist.hasmoreelements()){             portid=(commportidentifier) portlist.nextelement();              if (portid.getporttype()==commportidentifier.port_serial){                  if (portid.getname().equalsignorecase("com4")){                     sensor sensor1= new sensor(portid,portlist);                     try {                           thread.sleep(3000);                         }                         catch (exception e) {}                       jframe myframe = new jframe ("mouse controller");                      myframe.setvisible(true);                     myframe.setsize(400, 400);                     mousecontrolpanel mymousecontroller = new mousecontrolpanel(sensor1);                     myframe.add(mymousecontroller);                  }              }          }         } }

the content of window-

public class mousecontrolpanel extends jpanel  { /**  *   */ private static final long serialversionuid = 1l;  int i=0;  sensor sensor1; string value; public mousecontrolpanel (sensor sensor1){     this.sensor1=sensor1;     value=sensor1.getvalue()+""; }  public void paintcomponent (graphics g){     super.paintcomponent(g);     g.setfont(new font("ariel",font.italic,50));     g.drawstring(sensor1.getvalue()+"", 100, 100);     try {           thread.sleep(10);         }         catch (exception e) {}     repaint(); }    }

code can combined 1 class - put main mousecontrolpanel. see following problems:

  1. missing import statements
  2. nonexistent class sensor reference
  3. relies on classes javacomm - library detecting serial port activity must downloaded separately jdk - you're missing dependency when try run .jar - add classpath.

i cannot compile code, believe following if above solved work: 

import java.awt.font; import java.awt.graphics; import java.util.enumeration; // commportidentifier part of javacomm  // see http://reprap.org/wiki/javacomm description of , how import javax.comm.commportidentifier; import javax.swing.jframe; import javax.swing.jpanel;  public class mousecontrolpanel extends jpanel {     sensor sensor1; // class this?      string value;      public mousecontrolpanel(sensor sensor1) {         this.sensor1 = sensor1;         this.value = sensor1.getvalue() + "";     }      public void paintcomponent(graphics g) {         super.paintcomponent(g);         g.setfont(new font("ariel", font.italic, 50));         g.drawstring(sensor1.getvalue() + "", 100, 100);         thread.sleep(10);         repaint();     }      public static void main(string[] args) {         commportidentifier portid;         enumeration portlist;          portlist = commportidentifier.getportidentifiers();          while (portlist.hasmoreelements()) {             portid = (commportidentifier) portlist.nextelement();              // rewrote conditional guard clause             if (portid.getporttype() != commportidentifier.port_serial || !portid.getname().equalsignorecase("com4")) {                 continue;             }              sensor sensor1 = new sensor(portid, portlist);             thread.sleep(3000);              mousecontrolpanel mymousecontroller = new mousecontrolpanel(sensor1);             jframe myframe = new jframe("mouse controller");             myframe.setvisible(true);             myframe.setsize(400, 400);             myframe.add(mymousecontroller);         }     } }

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