Arduino disconnect and reconnect causes exception when uploading if serial monitor left open

[pfeerick]

Related partly to #3379 (actually discovered due to testing repeatability).

An exception error will occur if the serial monitor is opened, the arduino is unplugged, plugged back in, and then uploaded to. When you click upload a second time, it disables the serial monitor properly and uploads.

java.io.IOException: jssc.SerialPortException: Port name - COM6; Method name - setEventsMask(); Exception type - Can't set mask.
    at processing.app.Serial.dispose(Serial.java:146)
    at processing.app.SerialMonitor.close(SerialMonitor.java:108)
    at processing.app.AbstractMonitor.suspend(AbstractMonitor.java:206)
    at processing.app.Editor$DefaultExportHandler.run(Editor.java:2375)
    at java.lang.Thread.run(Thread.java:745)
Caused by: jssc.SerialPortException: Port name - COM6; Method name - setEventsMask(); Exception type - Can't set mask.
    at jssc.SerialPort.setEventsMask(SerialPort.java:279)
    at jssc.SerialPort.removeEventListener(SerialPort.java:1064)
    at jssc.SerialPort.closePort(SerialPort.java:1090)
    at processing.app.Serial.dispose(Serial.java:143)
    ... 4 more

[ffissore]

A fix to #3379 has just been pushed. Can you retry with the latest hourly build? http://www.arduino.cc/en/Main/Software#hourly

[pfeerick]

Just tested the Arduino 1.6.6 2015/06/23 05:51 hourly build, the exception message is gone, but now all that happens is the status area says 'Uploading to I/O Board...' - it doesn't compile and upload. If I click on upload a second time it does work.

[ffissore]

Does avrdude say the com port in unavailable?

[pfeerick]

I've just tried again with the latest hourly build, please ignore my previous message about it the message going away... with Hourly 1.6.6 2015/07/03 10:41 it is still there... I mustn't have waited long enought or held my tongue right before :-o error log reproduced below just in case it has moved....[which it has - AbstractMonitor and Editor are showing different line numbers]

Running the debug version of the IDE didn't give any more information. It looks like the gremlin is still in the IDE - which clears when clicking the compile button a second time.

java.io.IOException: jssc.SerialPortException: Port name - COM6; Method name - setEventsMask(); Exception type - Can't set mask.
    at processing.app.Serial.dispose(Serial.java:140)
    at processing.app.SerialMonitor.close(SerialMonitor.java:108)
    at processing.app.AbstractMonitor.suspend(AbstractMonitor.java:119)
    at processing.app.Editor$DefaultExportHandler.run(Editor.java:2423)
    at java.lang.Thread.run(Thread.java:745)
Caused by: jssc.SerialPortException: Port name - COM6; Method name - setEventsMask(); Exception type - Can't set mask.
    at jssc.SerialPort.setEventsMask(SerialPort.java:279)
    at jssc.SerialPort.removeEventListener(SerialPort.java:1064)
    at jssc.SerialPort.closePort(SerialPort.java:1090)
    at processing.app.Serial.dispose(Serial.java:137)
    ... 4 more

[bcraigie]

The problem still occurs in 1.6.9 on Windows 10. It seems to alternate between Can't Set Mask and Port Not Found.