Processing: one file will write, other won't - processing

Question

I have a strange error which I really can't seem to find out. The situation is that I have an arduino board with a temperature and a light sensor: the light sensor is used to see if a certain room is 'open' (light goes out if there's no movement in the room for a certain time). I'm using a Serial port to push data to a server running a Processing script. The arduino board pushes 'OPEN' if the sensed light is above a certain treshhold, 'CLOSED' if it's not. It also pushes the temperature on a newline. It repeats every two seconds.
Monitoring the serial port with minicom that all seems to work fine. Even in the script, the data that I output confirms that everything should work fine. Except that when I try to write data to a 'open.txt' it seems to not to so, while the 'temp.txt' works fine (Tried to tail -f both files, temp.txt gets updated while open.txt just kept being empty.
import processing.serial.*;
Serial mySerial;
PrintWriter openClosedFile;
String openClosedFileName;
String currentOpenClosed;
PrintWriter temperatureFile;
String temperatureFileName;
int currentTemp;
void setup()
{
mySerial = new Serial(this, Serial.list()[0], 9600);
openClosedFileName = "open.txt";
openClosedFile = createWriter(openClosedFileName);
currentOpenClosed = "CLOSED";
temperatureFileName = "temp.txt";
temperatureFile = createWriter(temperatureFileName);
currentTemp = 0;
}
void draw()
{
if (mySerial.available() > 0 )
{
String value = mySerial.readStringUntil('\n');
if ( value != null )
{
String timestamp = nf(day(),2) + "/" + nf(month(), 2) + "/" + year() + " " + nf(hour(),2) + ":" + nf(minute(),2) + ":" + nf(second(),2);
println(timestamp);
value = trim(value);
if (isNumeral(value))
writeTemperature(value);
else
writeOpenClosed(value);
}
}
}
void writeOpenClosed(String val)
{
print("OpenClosed: ");
println(val);
boolean writtenToFile = false;
openClosedFile = createWriter(openClosedFileName);
if (val.equals("OPEN") && !currentOpenClosed.equals("OPEN"))
{
println("val=OPEN and currentOpenClosed!=OPEN");
openClosedFile.print("1");
writtenToFile = true;
}
else if (val.equals("CLOSED") && !currentOpenClosed.equals("CLOSED"))
{
println("val=CLOSED and currentOpenClosed!=CLOSED");
openClosedFile.print("0");
writtenToFile = true;
}
if (writtenToFile)
{
currentOpenClosed = val;
openClosedFile.flush();
openClosedFile.close();
println("Written OpenClosed To File");
}
}
void writeTemperature(String val)
{
print("temperature: ");
println(val);
int intTemp = Integer.parseInt(val);
if (intTemp != currentTemp)
{
currentTemp = intTemp;
temperatureFile = createWriter(temperatureFileName);
temperatureFile.print(val);
temperatureFile.flush();
temperatureFile.close();
println("Written Temperature To File");
}
}
boolean isNumeral(String val)
{
for (int i = 0; i < val.length(); i++)
{
if (val.charAt(i) < 48 || val.charAt(i) > 57)
return false;
}
return true;
}
I expect there to be some syntactical error (I haven't used processing before), but both functions seems to be doing the same...
Some example output:
Listening for transport dt_socket at address: 8212
30/10/2014 12:14:57
OpenClosed: CD
30/10/2014 12:14:57
temperature: 24
Written Temperature To File
30/10/2014 12:14:59
OpenClosed: CLOSED
30/10/2014 12:14:59
temperature: 25
Written Temperature To File
30/10/2014 12:15:01
OpenClosed: CLOSED
30/10/2014 12:15:01
temperature: 24
Written Temperature To File
30/10/2014 12:15:03
OpenClosed: CLOSED
30/10/2014 12:15:03
temperature: 25
Written Temperature To File
30/10/2014 12:15:05
OpenClosed: OPEN
val=OPEN and currentOpenClosed!=OPEN
Written OpenClosed To File
30/10/2014 12:15:05
temperature: 20
Written Temperature To File
30/10/2014 12:15:07
OpenClosed: OPEN
30/10/2014 12:15:07
temperature: 20
30/10/2014 12:15:09
OpenClosed: OPEN
30/10/2014 12:15:09
temperature: 20
^C
Am I not seeing something, or what could be going on here?

Answer 1

Okay, I think I figured it out, it was actually me being dumb.
For eventual future readers: calling
openClosedFile = createWriter(openClosedFileName);
in the writeOpenClosed() function will open the file, and if nothing has to be written it will never get closed. Since the file will never be closed (as there will be a new object made next time the function gets called), it won't release the file to be read.