NumberFormatException with Serial Communication

winuuu

I'm trying to get the values read off from an arduino but I get a number format exception at the line where the line 'val = Integer.parseInt(s);' occurs. What's going on?

import processing.serial.*;

Serial myPort;
String portName;
String s;
int val;

void setup(){
  size(displayWidth/2, displayHeight/2);
  portName = Serial.list()[2];
  myPort = new Serial(this, portName, 9600);
}

void draw(){
  s = myPort.readStringUntil('\n');
  if (s != null) {
    val = Integer.parseInt(s);
    println("giving val number");
  } 
  print("From " + portName + ": \n"); //print it out in the console
  //println("\"" + s + "\"");

  println(val);
}

GoToLoop

http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html#parseInt-java.lang.String-
http://processing.org/reference/intconvert_.html

// forum.processing.org/two/discussion/5517/
// numberformatexception-with-serial-communication

final String s = "I'm not a number";

// Processing's int() merely returns 0
// for invalid conversion:
println(int(s));
println();

// While Java's parseInt() throws an Exception:
try {
  println(Integer.parseInt(s));
}

catch (NumberFormatException e) {
  println("\"" + s + "\"");
  println("can't be converted to a number!");
}

exit();