<AWT Dev> RFR: 8262731: [macOS] Exception from "Printable.print" is swallowed during "PrinterJob.print" [v2]

Phil Race prr at openjdk.java.net
Sun May 30 18:14:21 UTC 2021

On Fri, 21 May 2021 20:16:41 GMT, Anton Litvinov <alitvinov at openjdk.org> wrote:

>> Hello,
>> Could you please review the following fix for the bug specific to macOS. The bug consists in the fact that if the method "java.awt.print.Printable.print​(Graphics, PageFormat, int)" throws "java.awt.print.PrinterException" or "java.lang.RuntimeException" during the call "java.awt.print.PrinterJob.print()", then the exception is caught and ignored by JDK and a user cannot learn that printing failed and what caused failure of printing, because "PrinterJob.print()" method does not throw "PrinterException" or the occurred exception is not reported by JDK through the error stream.
>> The root cause of the bug is the fact that in the method "sun.lwawt.macosx.CPrinterJob.printAndGetPageFormatArea(final Printable, final Graphics, final PageFormat, final int)" from the file "src/java.desktop/macosx/classes/sun/lwawt/macosx/CPrinterJob.java" the exception thrown during execution of the expression
>> "int pageResult = printable.print(graphics, pageFormat, pageIndex);"
>> is caught but is not returned to a developer by any mean or is not printed out to the error stream.
>> The fix implements propagation of the occurred and caught exception to the level of the user's code executing "PrinterJob.print()" method. Propagation of the exception by storing it in the instance variable of "CPrinterJob" object is implemented, because the engaged code always is executed:
>> - on 2 threads (non-EDT thread, EDT thread) in case when "PrinterJob.print()" is called by the user on a non-EDT thread;
>> - on 3 threads (2 EDT threads, a temporary thread started by JDK to execute "CPrinterJob._safePrintLoop(long, long );") when "PrinterJob.print()" is called on EDT thread.
>> The regression test which is part of the fix was also successfully executed on MS Windows OS and Linux OS.
>> Thank you,
>> Anton
> Anton Litvinov has updated the pull request incrementally with one additional commit since the last revision:
>   Second version of the fix

test/jdk/java/awt/print/PrinterJob/ExceptionFromPrintableIsIgnoredTest.java line 32:

> 30:    @run main/manual ExceptionFromPrintableIsIgnoredTest MAIN RE
> 31:    @run main/manual ExceptionFromPrintableIsIgnoredTest EDT PE
> 32:    @run main/manual ExceptionFromPrintableIsIgnoredTest EDT RE

wjy is this still manual ?

test/jdk/java/awt/print/PrinterJob/ExceptionFromPrintableIsIgnoredTest.java line 85:

> 83:         PrinterJob job = PrinterJob.getPrinterJob();
> 84:         if (job.getPrintService() == null) {
> 85:             throw new RuntimeException("No printers are available.");

where does this exception go if it happens and you are on EDT ?

test/jdk/java/awt/print/PrinterJob/ExceptionFromPrintableIsIgnoredTest.java line 120:

> 118:                     (exceptionType == TestExceptionType.PE)) ||
> 119:                 ((printEx instanceof RuntimeException) &&
> 120:                     (exceptionType == TestExceptionType.RE))) {

1) I am fairly sure that I tested this case on Windows and nothing caught it so does this test work on Windows ?

2) I raised the question / suggestion that should we not wrap these in a PrinterException ? 
It at least needs to be thought through.

test/jdk/java/awt/print/PrinterJob/ExceptionFromPrintableIsIgnoredTest.java line 124:

> 122:             }
> 123:             throw new RuntimeException("Unexpected exception was thrown.");
> 124:         } else {

When running on the EDT do you really want to do this ?


PR: https://git.openjdk.java.net/jdk/pull/4036

More information about the awt-dev mailing list