Help Processing isn't reading my Arduino data from a fluviometer sensor

Projects Interfacing w/ Software on the Computer
1

Arduino code:

byte statusLed = 13;

byte sensorInterrupt = 0;
byte sensorPin = 2;
float calibrationFactor = 4.5;
volatile byte pulseCount;
float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;

unsigned long oldTime;

void pulseCounter()
{
pulseCount++;
}

void setup()
{

Serial.begin(9600);

while(!Serial)
{
while(Serial.available()<=0)
{
Serial.println("0,0,0");
}
}
pinMode(statusLed, OUTPUT);
digitalWrite(statusLed, HIGH);
pinMode(sensorPin, INPUT);
digitalWrite(sensorPin, HIGH);

pulseCount = 0;
flowRate = 0.0;
flowMilliLitres = 0;
totalMilliLitres = 0;
oldTime = 0;

attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}

void loop()
{

if((millis() - oldTime) > 1000)
{
detachInterrupt(sensorInterrupt);

flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;

oldTime = millis();

flowMilliLitres = (flowRate / 60) * 1000; // esto es a 0.75 lit

totalMilliLitres += flowMilliLitres;

unsigned int frac;

if(Serial.available()>0)
{
//Serial.print("Flow rate: ");
Serial.print(int(flowRate));
//Serial.print("L/min");
//Serial.print("\t");
Serial.print(",");
//Serial.print("Output Liquid Quantity: ");
Serial.println(totalMilliLitres);
//Serial.println("mL");
//Serial.print("\t");
//Serial.print(totalMilliLitres/1000);
//Serial.print("L");
}

pulseCount = 0;

attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}
}

Processing code:

byte statusLed = 13;

byte sensorInterrupt = 0;
byte sensorPin = 2;
float calibrationFactor = 4.5;
volatile byte pulseCount;
float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;

unsigned long oldTime;

void pulseCounter()
{
pulseCount++;
}

void setup()
{

Serial.begin(9600);

while(!Serial)
{
while(Serial.available()<=0)
{
Serial.println("0,0,0");
}
}
pinMode(statusLed, OUTPUT);
digitalWrite(statusLed, HIGH);
pinMode(sensorPin, INPUT);
digitalWrite(sensorPin, HIGH);

pulseCount = 0;
flowRate = 0.0;
flowMilliLitres = 0;
totalMilliLitres = 0;
oldTime = 0;

attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}

void loop()
{

if((millis() - oldTime) > 1000)
{
detachInterrupt(sensorInterrupt);

flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;

oldTime = millis();

flowMilliLitres = (flowRate / 60) * 1000; // esto es a 0.75 lit

totalMilliLitres += flowMilliLitres;

unsigned int frac;

if(Serial.available()>0)
{
//Serial.print("Flow rate: ");
Serial.print(int(flowRate));
//Serial.print("L/min");
//Serial.print("\t");
Serial.print(",");
//Serial.print("Output Liquid Quantity: ");
Serial.println(totalMilliLitres);
//Serial.println("mL");
//Serial.print("\t");
//Serial.print(totalMilliLitres/1000);
//Serial.print("L");
}

pulseCount = 0;

attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}
}

2 
  while(!Serial)
  {
    while(Serial.available()<=0)
    {
      Serial.println("0,0,0");
    }
  }

WTF? While the Serial interface is not ready, read any serial data that arrives. What are the odds of ANYTHING being read?

I'm almost certain that your Processing code looks NOTHING like that.