Failing to catch exceptions from smart card reader

Hi all,

Working on a script for using smart card readers with my application using the javax.smartcardio package. However the huge amount of exceptions thrown here when reading from the smart card is 50% of the time not catched in my try/except clause. The package usually throws one of these

javax.smartcardio.CardException
javax.smartcardio.CardNotPresentException
sun.security.smartcardio.PCSCException

The except clause looks like this

except (CardException, CardNotPresentException, PCSCException), e:
			
	# An error at this point should be related to reading the card. Notify card error
	#	by sending the error command to the terminal.
	self._terminal.NotifyError()
				
	if callable(self._onError):
		self._onError(e)

Any ideas anyone? As said, the clause works approx 50% of the times.

EDIT

Forgot to mention, tried catching from java.lang.Exception as all of the exceptions mentioned derives from this. This doesn’t seem to work either.

And here’s a full trace of a card scan.

com.inductiveautomation.ignition.common.script.TimerScriptTask - Error executing global timer script: 
com.inductiveautomation.ignition.common.script.JythonExecException: Traceback (most recent call last):
  File "<TimerScript:WeldingTool/Check Reader Input @100ms >", line 3, in <module>
  File "<module:project.smartcardio>", line 242, in ListenOnce
  File "<module:project.smartcardio>", line 314, in _listenOnce
  File "<module:project.smartcardio>", line 109, in NotifyError
	at sun.security.smartcardio.ChannelImpl.doTransmit(Unknown Source)

	at sun.security.smartcardio.ChannelImpl.transmit(Unknown Source)

	at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)


javax.smartcardio.CardException: javax.smartcardio.CardException: sun.security.smartcardio.PCSCException: SCARD_W_REMOVED_CARD

	at org.python.core.Py.JavaError(Py.java:495)
	at org.python.core.Py.JavaError(Py.java:488)
	at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:188)
	at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:204)
	at org.python.core.PyObject.__call__(PyObject.java:404)
	at org.python.core.PyObject.__call__(PyObject.java:408)
	at org.python.core.PyMethod.__call__(PyMethod.java:124)
	at org.python.pycode._pyx2.NotifyError$12(<module:project.smartcardio>:110)
	at org.python.pycode._pyx2.call_function(<module:project.smartcardio>)
	at org.python.core.PyTableCode.call(PyTableCode.java:165)
	at org.python.core.PyBaseCode.call(PyBaseCode.java:134)
	at org.python.core.PyFunction.__call__(PyFunction.java:317)
	at org.python.core.PyMethod.__call__(PyMethod.java:109)
	at org.python.pycode._pyx2._listenOnce$28(<module:project.smartcardio>:336)
	at org.python.pycode._pyx2.call_function(<module:project.smartcardio>)
	at org.python.core.PyTableCode.call(PyTableCode.java:165)
	at org.python.core.PyBaseCode.call(PyBaseCode.java:149)
	at org.python.core.PyFunction.__call__(PyFunction.java:327)
	at org.python.core.PyMethod.__call__(PyMethod.java:124)
	at org.python.pycode._pyx2.ListenOnce$27(<module:project.smartcardio>:255)
	at org.python.pycode._pyx2.call_function(<module:project.smartcardio>)
	at org.python.core.PyTableCode.call(PyTableCode.java:165)
	at org.python.core.PyBaseCode.call(PyBaseCode.java:301)
	at org.python.core.PyBaseCode.call(PyBaseCode.java:141)
	at org.python.core.PyFunction.__call__(PyFunction.java:327)
	at org.python.core.PyMethod.__call__(PyMethod.java:124)
	at org.python.pycode._pyx0.f$0(<TimerScript:WeldingTool/Check Reader Input @100ms >:3)
	at org.python.pycode._pyx0.call_function(<TimerScript:WeldingTool/Check Reader Input @100ms >)
	at org.python.core.PyTableCode.call(PyTableCode.java:165)
	at org.python.core.PyCode.call(PyCode.java:18)
	at org.python.core.Py.runCode(Py.java:1275)
	at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:636)
	at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:603)
	at com.inductiveautomation.ignition.common.script.TimerScriptTask.run(TimerScriptTask.java:88)
	at java.util.TimerThread.mainLoop(Unknown Source)
	at java.util.TimerThread.run(Unknown Source)
Caused by: org.python.core.PyException: Traceback (most recent call last):
  File "<TimerScript:WeldingTool/Check Reader Input @100ms >", line 3, in <module>
  File "<module:project.smartcardio>", line 242, in ListenOnce
  File "<module:project.smartcardio>", line 314, in _listenOnce
  File "<module:project.smartcardio>", line 109, in NotifyError
	at sun.security.smartcardio.ChannelImpl.doTransmit(Unknown Source)

	at sun.security.smartcardio.ChannelImpl.transmit(Unknown Source)

	at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)


javax.smartcardio.CardException: javax.smartcardio.CardException: sun.security.smartcardio.PCSCException: SCARD_W_REMOVED_CARD

	... 36 common frames omitted
Caused by: javax.smartcardio.CardException: sun.security.smartcardio.PCSCException: SCARD_W_REMOVED_CARD
	at sun.security.smartcardio.ChannelImpl.doTransmit(Unknown Source)
	at sun.security.smartcardio.ChannelImpl.transmit(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:186)
	... 33 common frames omitted
Caused by: sun.security.smartcardio.PCSCException: SCARD_W_REMOVED_CARD
	at sun.security.smartcardio.PCSC.SCardTransmit(Native Method)
	... 39 common frames omitted
21:29:25.199 [client-script-dedicated-timer-[WeldingTool/Check Reader Input]] ERROR com.inductiveautomation.ignition.common.script.TimerScriptTask - Error executing global timer script: WeldingTool/Check Reader Input @100ms . Repeat errors of this type will be logged as 'debug' messages.
com.inductiveautomation.ignition.common.script.JythonExecException: Traceback (most recent call last):
  File "<TimerScript:WeldingTool/Check Reader Input @100ms >", line 3, in <module>
  File "<module:project.smartcardio>", line 242, in ListenOnce
  File "<module:project.smartcardio>", line 314, in _listenOnce
  File "<module:project.smartcardio>", line 109, in NotifyError
	at sun.security.smartcardio.ChannelImpl.doTransmit(Unknown Source)

	at sun.security.smartcardio.ChannelImpl.transmit(Unknown Source)

	at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)


javax.smartcardio.CardException: javax.smartcardio.CardException: sun.security.smartcardio.PCSCException: SCARD_W_REMOVED_CARD

	at org.python.core.Py.JavaError(Py.java:495)
	at org.python.core.Py.JavaError(Py.java:488)
	at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:188)
	at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:204)
	at org.python.core.PyObject.__call__(PyObject.java:404)
	at org.python.core.PyObject.__call__(PyObject.java:408)
	at org.python.core.PyMethod.__call__(PyMethod.java:124)
	at org.python.pycode._pyx2.NotifyError$12(<module:project.smartcardio>:110)
	at org.python.pycode._pyx2.call_function(<module:project.smartcardio>)
	at org.python.core.PyTableCode.call(PyTableCode.java:165)
	at org.python.core.PyBaseCode.call(PyBaseCode.java:134)
	at org.python.core.PyFunction.__call__(PyFunction.java:317)
	at org.python.core.PyMethod.__call__(PyMethod.java:109)
	at org.python.pycode._pyx2._listenOnce$28(<module:project.smartcardio>:336)
	at org.python.pycode._pyx2.call_function(<module:project.smartcardio>)
	at org.python.core.PyTableCode.call(PyTableCode.java:165)
	at org.python.core.PyBaseCode.call(PyBaseCode.java:149)
	at org.python.core.PyFunction.__call__(PyFunction.java:327)
	at org.python.core.PyMethod.__call__(PyMethod.java:124)
	at org.python.pycode._pyx2.ListenOnce$27(<module:project.smartcardio>:255)
	at org.python.pycode._pyx2.call_function(<module:project.smartcardio>)
	at org.python.core.PyTableCode.call(PyTableCode.java:165)
	at org.python.core.PyBaseCode.call(PyBaseCode.java:301)
	at org.python.core.PyBaseCode.call(PyBaseCode.java:141)
	at org.python.core.PyFunction.__call__(PyFunction.java:327)
	at org.python.core.PyMethod.__call__(PyMethod.java:124)
	at org.python.pycode._pyx0.f$0(<TimerScript:WeldingTool/Check Reader Input @100ms >:3)
	at org.python.pycode._pyx0.call_function(<TimerScript:WeldingTool/Check Reader Input @100ms >)
	at org.python.core.PyTableCode.call(PyTableCode.java:165)
	at org.python.core.PyCode.call(PyCode.java:18)
	at org.python.core.Py.runCode(Py.java:1275)
	at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:636)
	at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:603)
	at com.inductiveautomation.ignition.common.script.TimerScriptTask.run(TimerScriptTask.java:88)
	at java.util.TimerThread.mainLoop(Unknown Source)
	at java.util.TimerThread.run(Unknown Source)
Caused by: org.python.core.PyException: Traceback (most recent call last):
  File "<TimerScript:WeldingTool/Check Reader Input @100ms >", line 3, in <module>
  File "<module:project.smartcardio>", line 242, in ListenOnce
  File "<module:project.smartcardio>", line 314, in _listenOnce
  File "<module:project.smartcardio>", line 109, in NotifyError
	at sun.security.smartcardio.ChannelImpl.doTransmit(Unknown Source)

	at sun.security.smartcardio.ChannelImpl.transmit(Unknown Source)

	at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)


javax.smartcardio.CardException: javax.smartcardio.CardException: sun.security.smartcardio.PCSCException: SCARD_W_REMOVED_CARD

	... 36 common frames omitted
Caused by: javax.smartcardio.CardException: sun.security.smartcardio.PCSCException: SCARD_W_REMOVED_CARD
	at sun.security.smartcardio.ChannelImpl.doTransmit(Unknown Source)
	at sun.security.smartcardio.ChannelImpl.transmit(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:186)
	... 33 common frames omitted
Caused by: sun.security.smartcardio.PCSCException: SCARD_W_REMOVED_CARD
	at sun.security.smartcardio.PCSC.SCardTransmit(Native Method)
	... 39 common frames omitted

The next thing that happens after this is the card is successfully read, however it seems like when the card is nearing the contactless scanner a bunch of exceptions is thrown.

Consider catching all exceptions and then following the caused by chain to find your specific exceptions. Specifying exception types only filters on the outermost exception.

How do I catch all exceptions and also get the exception for use in the except clause without knowing what to catch? As mentioned catching java.lang.Exception has the same issue with reliability and catching Pythons Exception never catches any of these.

Anyway, after posting the trace I actually think I found the line of information I need to stop this. Have been looking at this all day :slight_smile:

Set up two clauses, like so:

# Important! Do not use "from java.lang import Exception", as that will
# hide access to jython's Exception class.
import java.lang.Exception

def something():
	try:
		# do something
		pass
	except java.lang.Exception, e:
		# Handle java exceptions
		# follow e.cause, e.cause.cause, .... to examine nested exceptions
		pass
	except Exception, e:
		# Handle jython exceptions
		pass
1 Like