RFR 8244105: JDK 11.0.7 -Xlog gc issue with file path if not exist

[David Holmes]

On 12/05/2020 1:06 am, dmytro sheyko wrote:
> Hi,
> 
> I think it would be very convenient for app developers if JVM were able 
> to create intermediate directories to gc.log file if they do not exist.

You can file a RFE for that, but personally I don't think it is 
something the VM should do.

Cheers,
David

> I.e.
>    $ if [ -f logs/gc.log ]; then echo "log file exists"; else echo "log 
> file does not exist"; fi
>    log file does not exist
> 
>    $ if [ -d logs ]; then echo "log directory exists"; else echo "log 
> directory does not exist"; fi
>    log directory does not exist
> 
>    $ java -Xlog:"gc*:file=logs/gc.log" -version
>    ...
> 
>    $ if [ -d logs ]; then echo "log directory exists"; else echo "log 
> directory does not exist"; fi
>    log directory exists
> 
>    $ if [ -f logs/gc.log ]; then echo "log file exists"; else echo "log 
> file does not exist"; fi
>    log file exists
> 
> Thanks,
> Dmytro
> 
> On Fri, May 8, 2020 at 8:31 PM Harold Seigel <harold.seigel at oracle.com 
> <mailto:harold.seigel at oracle.com>> wrote:
> 
>     Hi,
> 
>     Please review this fix for JDK-8244105.  The fix continues program
>     execution even when specified logging options are invalid. 
>     Previously, invalid logging options terminated the program.  Now, a
>     warning is issued.  For example:
> 
>          > java -Xlog:"gc*:file=/dont/exist" -version
>         [0.001s][error][logging] Error opening log file '/dont/exist':
>         No such file or directory
>         [0.001s][error][logging] Initialization of output
>         'file=/dont/exist' using options '(null)' failed.
>         Java HotSpot(TM) 64-Bit Server VM warning: Invalid -Xlog option
>         '-Xlog:gc*:file=/dont/exist', see error log for details.
> 
>         java version "15-internal" 2020-09-15
>         Java(TM) SE Runtime Environment (fastdebug build
>         15-internal+0-2020-05-08-1313404.hseigel.bug8244105)
>         Java HotSpot(TM) 64-Bit Server VM (fastdebug build
>         15-internal+0-2020-05-08-1313404.hseigel.bug8244105, mixed mode,
>         sharing)
> 
>     Open Webrev:
>     http://cr.openjdk.java.net/~hseigel/bug_8244105/webrev/index.html
> 
>     JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8244105
> 
>     The fix was regression tested by running Mach5 tiers 1 and 2 tests
>     and builds on Linux-x64, Solaris, Windows, and Mac OS X and by
>     running Mach5 tiers 3-5 tests on Linux-x64.
> 
>     Thanks, Harold
> 
>