javax.print.PrintException: PrintService is no longer available.

[tresf]

Some PCs throw the following error when printing. This may be caused by PrintService caching, which was added in #486 as part of some printer crawling/caching/performance improvements.

Steps to reproduce (unconfirmed)

• User printed a few tickets successfully at 8:11.
• User disconnected printer
• Then at 11 :33 user reconnected printer and tried to print other tickets
• User had the error
• Printing with Qz Tray didn’t work anymore
• User had to exit and relaunch Qz Tray and then it worked

...

• As a bare minimum, we may need to force a recrawl of the printers when this occurs, to avoid a hard-failure.
• A permanent fix should better handle the loss of the PrintService pointer.

The message error is :

2023-10-04T11:34:42,722 [ERROR] Failed to print
javax.print.PrintException: PrintService is no longer available.
                at sun.print.Win32PrintJob.print(Unknown Source) ~[?:?]
                at qz.printer.action.PrintRaw.waitForPrint(PrintRaw.java:437) ~[qz-tray.jar:?]
                at qz.printer.action.PrintRaw.printToPrinter(PrintRaw.java:394) ~[qz-tray.jar:?]
                at qz.printer.action.PrintRaw.print(PrintRaw.java:339) ~[qz-tray.jar:?]
                at qz.utils.PrintingUtilities.processPrintRequest(PrintingUtilities.java:200) ~[qz-tray.jar:?]
                at qz.ws.PrintSocketClient.processMessage(PrintSocketClient.java:299) ~[qz-tray.jar:?]
                at qz.ws.PrintSocketClient.onMessage(PrintSocketClient.java:165) ~[qz-tray.jar:?]
                at jdk.internal.reflect.GeneratedMethodAccessor5.invoke(Unknown Source) ~[?:?]
                at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
                at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?]
                at org.eclipse.jetty.websocket.common.events.annotated.CallableMethod.call(CallableMethod.java:70) ~[qz-tray.jar:?]
                at org.eclipse.jetty.websocket.common.events.annotated.OptionalSessionCallableMethod.call(OptionalSessionCallableMethod.java:68) ~[qz-tray.jar:?]
                at org.eclipse.jetty.websocket.common.events.JettyAnnotatedEventDriver.lambda$onTextFrame$1(JettyAnnotatedEventDriver.java:270) ~[qz-tray.jar:?]
                at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883) ~[qz-tray.jar:?]
                at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034) ~[qz-tray.jar:?]
                at java.lang.Thread.run(Unknown Source) ~[?:?]

[Vzor-]

I tested this on Windows 10 with a BOCA Lemur via USB. I did the following procedure:

• Connected the printer and set it as default
• Started QZ tray
• Called 'find printer' on the exact printer name
• Printed a test, and confirmed it worked
• Disconnected the printer and waited
• Reconnected the printer and waited
• Printed a second test, and confirmed it worked

The logs are here https://gist.github.com/Vzor-/6e8da80a1d1ae9a57f552c68d1d22632 I was unable to reproduce the issue.

[tresf]

I was unable to reproduce the issue.

Me neither. I'm not sure what causes this, but we'll need steps to reproduce to fix it. Closing for now, if it occurs again, please request that it's reopened, preferably with steps to reproduce.

[tresf]

Duplicate of #1259