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[on:]

//import Serial communication library
import processing.serial.*;

//init variables
Serial commPort;
float tempC;
float tempF;
int yDist;
PFont font12;
PFont font24;
float[] tempHistory = new float[100];

void setup()
{
  //setup fonts for use throughout the application
  //font12 = loadFont("Verdana-12.vlw");
  //font24 = loadFont("Verdana-24.vlw");
 
  //set the size of the window
  size(210, 200);
 
  //init serial communication port
  commPort = new Serial(this, "COM1", 9600);
 
  //fill tempHistory with default temps
  for(int index = 0; index<100; index++)
    tempHistory[index] = 0;
}

void draw()
{
  //get the temp from the serial port
  while (commPort.available() > 0)
  {
    tempC = commPort.read();
 
    //refresh the background to clear old data
    background(123);

    //draw the temp rectangle
    colorMode(RGB, 160);  //use color mode sized for fading
    stroke (0);
    rect (49,19,22,162);
    //fade red and blue within the rectangle
    for (int colorIndex = 0; colorIndex <= 160; colorIndex++)
    {
      stroke(160 - colorIndex, 0, colorIndex);
      line(50, colorIndex + 20, 70, colorIndex + 20);
    }
   
    //draw graph
    stroke(0);
    fill(255,255,255);
    rect(90,80,100,100);
    for (int index = 0; index<100; index++)
    { 
      if(index == 99)
        tempHistory[index] = tempC;
      else
        tempHistory[index] = tempHistory[index + 1];
      point(90 + index, 180 - tempHistory[index]);
    }
 
    //write reference values
    fill(0,0,0);
    textFont(font12);
    textAlign(RIGHT);
    text("212 F", 45, 25);
    text("32 F", 45, 187);
 
    //draw triangle pointer
    yDist = int(160 - (160 * (tempC * 0.01)));
    stroke(0);
    triangle(75, yDist + 20, 85, yDist + 15, 85, yDist + 25);
 
    //write the temp in C and F
    fill(0,0,0);
    textFont(font24);
    textAlign(LEFT);
    text(str(int(tempC)) + " C", 115, 37);
    tempF = ((tempC*9)/5) + 32;
    text(str(int(tempF)) + " F", 115, 65);
  }
}

am feeding  the output values of sensor using simulator for arduino software..now when ever am giving the same port number to both the applications am getting the error!

[Reply #1 on:]

now when ever am giving the same port number to both the applications am getting the error!

In the history of the universe, there has been more than one error. You are not getting "the error". You are getting an error, but you haven't told us that there error is.

am feeding  the output values of sensor using simulator for arduino software.

So, you are not using an Arduino at all? Why are you here, then?

[Reply #2 on:]

In the history of the universe, there has been more than one error. You are not getting "the error". You are getting an error, but you haven't told us that there error is.

You make me laugh most of the times...

Your code.

while (commPort.available() > 0)
  {
    tempC = commPort.read();
   // and a million things here inside the while loop?
 }


//maybe better

if (commPort.available() > 0)
  {
    tempC = commPort.read();
    commPort.clear(); //let's clear the Port after reading the value.
  }

or

while(commPort.available()<1)
{}
tempC = commPort.read();
commPort.clear();

This is probably not the source of your error; which by the way like Paul mentioned we don't know what it is. Maybe just another way to write the code.