there seems to be an Error inside Serial.<init>()

Core Library Questions

rgpietru

there seems to be an Error inside Serial.<init>()

Answered

Need more info
Answered
Working on it

in Core Library Questions • 3 years ago

Hi Everyone,

I'm having an issue accessing the serial ports with a very simple processing sketch used to drive an arduino.

I've been reading around the forums but all related issues are either slightly different or legacy.

In short, Processing gives me an error when I try to open the serial port that the arduino is connected to. It is seeing the port in use, though I'm fairly sure nothing else is using it. There are no other applications open and I've restarted. To troubleshoot, I've used Terminal and am able to open the port, talk to the arduino, and close the port with no problems at all.

I know variations of this problem have cropped up in the past. Help would be greatly appreciated as I'm not sure what else to try.

Thanks in advance.

Here we go:

OSX 10.5.8
Processing 0187 pre-release
Preferred Java version Java 5.0 64-bit

CODE:

Serial prt;

void setup() {
     size(400, 400);

    println(Serial.list());
     prt = new Serial(this, Serial.list()[0], 9600);
}

CONSOLE:

Error inside Serial.<init>()

Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7
[0] "/dev/tty.usbserial-A800eKiK"
[1] "/dev/cu.usbserial-A800eKiK"
[2] "/dev/tty.Bluetooth-PDA-Sync"
[3] "/dev/cu.Bluetooth-PDA-Sync"
[4] "/dev/tty.Bluetooth-Modem"
[5] "/dev/cu.Bluetooth-Modem"

gnu.io.PortInUseException: Unknown Application
    at gnu.io.CommPortIdentifier.open(CommPortIdentifier.java:354)
    at processing.serial.Serial.<init>(Serial.java:139)
    at processing.serial.Serial.<init>(Serial.java:105)
    at processingTest01.setup(processingTest01.java:61)
    at processing.core.PApplet.handleDraw(PApplet.java:1583)
    at processing.core.PApplet.run(PApplet.java:1503)
    at java.lang.Thread.run(Thread.java:613)
processing.app.debug.RunnerException: RuntimeException: Error inside Serial.<init>()
    at processing.app.Sketch.placeException(Sketch.java:1543)
    at processing.app.debug.Runner.findException(Runner.java:583)
    at processing.app.debug.Runner.reportException(Runner.java:558)
    at processing.app.debug.Runner.exception(Runner.java:498)
    at processing.app.debug.EventThread.exceptionEvent(EventThread.java:367)
    at processing.app.debug.EventThread.handleEvent(EventThread.java:255)
    at processing.app.debug.EventThread.run(EventThread.java:89)
Exception in thread "Animation Thread" java.lang.RuntimeException: Error inside Serial.<init>()
    at processing.serial.Serial.errorMessage(Serial.java:591)
    at processing.serial.Serial.<init>(Serial.java:151)
    at processing.serial.Serial.<init>(Serial.java:105)
    at processingTest01.setup(processingTest01.java:61)
    at processing.core.PApplet.handleDraw(PApplet.java:1583)
    at processing.core.PApplet.run(PApplet.java:1503)
    at java.lang.Thread.run(Thread.java:613)

Replies(2)

rgpietru

Re: there seems to be an Error inside Serial.<init>()

3 years ago

I was able to fix this problem on my own. Hopefully this will be helpful to anyone in the future who has a similar problem.

http://jlog.org/rxtx-mac.html

Ignore the fact that this on the jlog site. For whatever reason, I did not have 'RXTXcomm.jar' and 'librxtxSerial.jnilib' installed in my /Library/Java/Extensions folder previously. (I haven't seen mention of this in the past--- needing it for Processing.) I also ran the script to fix permissions. It all seems to be working now.

stixan

Re: there seems to be an Error inside Serial.<init>()

3 years ago

...might wan't to re-open this question?

On a system similar to the one described above, I managed to establish a fully working RXTX communication following the exact files and install steps described on http://jlog.org/rxtx-mac.html Returning to my Mac next day, after booting the system, all I got was the dreaded "gnu.io.PortInUseException" (see above).

This problem has been driving me crazy for two days now. I've tried every possible release of RXTX library and several Java VMs. Still getting "gnu.io.PortInUseException"

I'm starting to loose hope of ever getting the Serial library and RXTX to work again.

...please, any suggestions (or solutions!) as to what might be causing this problem?

UPDATE: To the best of my knowlegde, the RXTX-2.1-7 lib that ships with the current release of Processing is compiled to NOT USE lockfiles, thus eliminating the need for chmodding hidden "/var/lock/" or "/var/spool/uucp/" folders and manually appending the group "uucp" to the current user profile. Am I right?

UPDATE: Trying to zap the PRAM hoping it might reset any port info. This might not be the case in OS X, but I'm desperate...

Top Reply