Processing no compiles on Arduino UNO R3

Processing Electronics (Arduino, etc.)
6

Try reading the data with serialEvent():

// Example by Tom Igoe 
 
import processing.serial.*; 
 
Serial myPort;    // The serial port
String inString;  // Input string from serial port
int lf = 10;      // ASCII linefeed 
 
void setup() { 
  size(400,200); 
  // List all the available serial ports: 
  printArray(Serial.list()); 
  myPort = new Serial(this, Serial.list()[3], 9600); 
  myPort.bufferUntil(lf); 
} 
 
void draw() { 
  background(0);
  textSize(24.0);
  text("received: " + inString, 10,50); 
} 
 
void serialEvent(Serial p) { 
  inString = p.readString(); 
}

Make sure that your Arduino is sending something:
Arduino code:

void setup() {
 Serial.begin(9600);
 Serial.println("Processing is great.");
}

void loop() {
}
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