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portInUseException (Read 2989 times)
Josep M
portInUseException
Jul 15th, 2009, 11:44am  
Hi all,
don't know how to solve it...I only managed to open a serial comm with an FTDI based hardware once. I always get a portinuseexception under Vista when I try to open a valid and available port...any ideas?


gnu.io.PortInUseException: Unknown Application
     at gnu.io.CommPortIdentifier.open(CommPortIdentifier.java:354)
     at processing.serial.Serial.<init>(Serial.java:136)
     at processing.serial.Serial.<init>(Serial.java:102)
     at sketch_jul15a.setup(sketch_jul15a.java:72)
     at processing.core.PApplet.handleDraw(PApplet.java:1403)
     at processing.core.PApplet.run(PApplet.java:1328)
     at java.lang.Thread.run(Thread.java:619)
Exception in thread "Animation Thread" java.lang.RuntimeException: Error inside Serial.<init>()
     at processing.serial.Serial.errorMessage(Serial.java:588)
     at processing.serial.Serial.<init>(Serial.java:148)
     at processing.serial.Serial.<init>(Serial.java:102)
     at sketch_jul15a.setup(sketch_jul15a.java:72)
     at processing.core.PApplet.handleDraw(PApplet.java:1403)
     at processing.core.PApplet.run(PApplet.java:1328)
     at java.lang.Thread.run(Thread.java:619)
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brett.h
Re: portInUseException
Reply #1 - Aug 10th, 2009, 8:16pm  
I'm getting the exact same error. Whether I call new Arduino(this, Arduino.list()[0], 9600); or Serial(this, Serial.list()[0], 9600); the error pops up. There are no other applications accessing the serial port, unless it is trying to open the port twice, through this animation routine?

Any ideas, anyone?
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NoahBuddy
Re: portInUseException
Reply #2 - Aug 11th, 2009, 1:15am  
What is the output of Code:
println(Arduino.list());

Also, where in your code is this called?

Edit: I should have also asked; "Where is the constructor called?"
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« Last Edit: Aug 15th, 2009, 1:44am by N/A »  
 
ecphora
Re: portInUseException
Reply #3 - Aug 14th, 2009, 3:24pm  
I have the same problem on a Vista machine.  My println()s in setup() are being printed out twice, so it seems to me that setup() is being called twice and the Port In Use error is generated because I already have the port open.

Why would setup() be called more than once?

So put some prints in setup() and see if you have this situation.
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ecphora
Re: portInUseException
Reply #4 - Aug 14th, 2009, 3:47pm  
This is why setup() is called twice:

size() has to be the first call in setup().

This board won't let me post a link to the page since I have too few posts, but consult the documentation for the size() function.
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kotoko
Re: portInUseException
Reply #5 - Mar 26th, 2010, 7:42am  
I think the size() has nothing to do with it but a important thing to do regardless if you are communicating in serial.

Did it work for you?

I have the same problem but didn't fix it.
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