I'm receiving the following error after a print job executed on an Star TSP100III printer.
#0. Crashed: Thread-58
at com.starmicronics.stario.e.readPort(Unknown Source)
at com.starmicronics.stario.e.retreiveStatus(Unknown Source)
at com.starmicronics.starioextension.StarIoExtManager$g.run(SourceFile:875)
--
Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.bulkTransfer(android.hardware.usb.UsbEndpoint, byte[], int, int)' on a null object reference
at com.starmicronics.stario.e.readPort(Unknown Source)
at com.starmicronics.stario.e.retreiveStatus(Unknown Source)
at com.starmicronics.starioextension.StarIoExtManager$g.run(SourceFile:875)
#0. Crashed: Thread-58
at com.starmicronics.stario.e.readPort(Unknown Source)
at com.starmicronics.stario.e.retreiveStatus(Unknown Source)
at com.starmicronics.starioextension.StarIoExtManager$g.run(SourceFile:875)
#1. FinalizerWatchdogDaemon
at java.lang.Object.wait(Object.java)
at java.lang.Daemons$FinalizerWatchdogDaemon.sleepUntilNeeded(Daemons.java:269)
at java.lang.Daemons$FinalizerWatchdogDaemon.run(Daemons.java:249)
at java.lang.Thread.run(Thread.java:761)
#2. ReferenceQueueDaemon
at java.lang.Object.wait(Object.java)
at java.lang.Daemons$ReferenceQueueDaemon.run(Daemons.java:150)
at java.lang.Thread.run(Thread.java:761)
#3. pool-42-thread-1
at java.lang.Object.wait(Object.java)
at java.lang.Thread.parkFor$(Thread.java:2127)
at sun.misc.Unsafe.park(Unsafe.java:325)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:161)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2035)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1091)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1084)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1058)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1118)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
#4. pool-47-thread-1
at java.lang.Object.wait(Object.java)
at java.lang.Thread.parkFor$(Thread.java:2127)
at sun.misc.Unsafe.park(Unsafe.java:325)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:161)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2035)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1091)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1084)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1058)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1118)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
#5. pool-9-thread-1
at java.lang.Object.wait(Object.java)
at java.lang.Thread.parkFor$(Thread.java:2127)
at sun.misc.Unsafe.park(Unsafe.java:325)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:161)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2035)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1091)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1084)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1058)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1118)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
#6. pool-11-thread-1
at java.lang.Object.wait(Object.java)
at java.lang.Thread.parkFor$(Thread.java:2127)
at sun.misc.Unsafe.park(Unsafe.java:325)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:161)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2035)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1091)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1084)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1058)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1118)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
But the exception stack trace doesn't point to any place where the crash was caused from my code.
protected Void doInBackground(String... params) {
StarIOPort port = null;
try {
// Port open
port = starIoExtManager.getPort();
// Print end monitoring -Start
status = port.beginCheckedBlock();
//printer is online
byte[] command = PrinterFunctions.createRasterData(selectedStarReceiptPrinter.getEmulation(), bitmapToPrint, selectedStarReceiptPrinter.getPaperWidth(), true);
port.writePort(command, 0, command.length);
bitmapToPrint.recycle();
// Print end monitoring -Endt
status = port.endCheckedBlock();
} catch (StarIOPortException e) {
// Error
starPrinterException = e;
Log.i(TAG, ">>>>>>>>>>>>>>>>> PRINTER ERROR: 2 - BitmapPrintAsyncTask | StarIOPortException");
} catch (Exception e) {
e.printStackTrace();
Log.i(TAG, ">>>>>>>>>>>>>>>>> PRINTER ERROR: 2 - BitmapPrintAsyncTask | Exception");
}finally {
try {
// Port close
StarIOPort.releasePort(port);
} catch (StarIOPortException e) {
}
}
return null;
}
This is an example code where printing function is used. I'm using StarIoExtManager to handle printer statuses.
How to find the root cause in an instance like this?
