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Posted to user@commons.apache.org by Bernhard Fey <be...@realobjects.com> on 2021/11/26 16:56:47 UTC

[logging] How to configure transitive Commons Logging dependency without affecting the entire Java environment?

Hello,

While integrating PDFBox into our PDF library we ran into an issue with its usage of Commons Logging. During our research we only found ways to globally configure logging for the entire Java environment, which we cannot do:
Our use case is that our customers use our library in their Java environment to create PDFs and optionally merge them with existing PDFs. The latter is being migrated to use PDFBox.
Logging in our library is handled by a separate Java logger instance for each conversion. Multiple conversions can be executed at the same time, in different threads.
Our goal is to forward the log output of each PDFBox operation to the logger of the conversion that invoked it.
However, as we are shipping a library, to be used in an arbitrary Java environment, we cannot do any configuration that affects the entire environment, e.g. all Commons Logging loggers or all loggers used by PDFBox no matter if executed by our library or another one.

Thanks in advance.

Bernhard FeyProduct Development
Team Martha
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RealObjects GmbH
Altenkesseler Str. 17/B6
66115 Saarbrücken, Germany
Tel +49 (0)681 98579 0
Fax +49 (0)681 98579 29
http://www.realobjects.com<http://www.realobjects.com/>
bernhard.fey@realobjects.com<ma...@realobjects.com>
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Commercial Register: Amtsgericht Saarbrücken, HRB 12016
Managing Directors: Michael Jung, Markus Neurohr
VAT-ID: DE210373115

Re: [logging] How to configure transitive Commons Logging dependency without affecting the entire Java environment?

Posted by Bernd Eckenfels <ec...@zusammenkunft.net>.
Hello,

Not sure how PDFBox works, but if you cannot specify a logger, than you will need to register a global common s logging SPI which in turn forwards the log events to your thread local logger. Or you use log4j impl, and then append such an Appender or Category to log4j.

Gruss
Bernd


--
http://bernd.eckenfels.net
________________________________
Von: Bernhard Fey <be...@realobjects.com>
Gesendet: Friday, November 26, 2021 5:56:47 PM
An: user@commons.apache.org <us...@commons.apache.org>
Betreff: [logging] How to configure transitive Commons Logging dependency without affecting the entire Java environment?

Hello,

While integrating PDFBox into our PDF library we ran into an issue with its usage of Commons Logging. During our research we only found ways to globally configure logging for the entire Java environment, which we cannot do:
Our use case is that our customers use our library in their Java environment to create PDFs and optionally merge them with existing PDFs. The latter is being migrated to use PDFBox.
Logging in our library is handled by a separate Java logger instance for each conversion. Multiple conversions can be executed at the same time, in different threads.
Our goal is to forward the log output of each PDFBox operation to the logger of the conversion that invoked it.
However, as we are shipping a library, to be used in an arbitrary Java environment, we cannot do any configuration that affects the entire environment, e.g. all Commons Logging loggers or all loggers used by PDFBox no matter if executed by our library or another one.

Thanks in advance.

Bernhard FeyProduct Development
Team Martha
- - - - - - - - - - - - - - - -
RealObjects GmbH
Altenkesseler Str. 17/B6
66115 Saarbrücken, Germany
Tel +49 (0)681 98579 0
Fax +49 (0)681 98579 29
http://www.realobjects.com<http://www.realobjects.com/>
bernhard.fey@realobjects.com<ma...@realobjects.com>
- - - - - - - - - - - - - - - -
Commercial Register: Amtsgericht Saarbrücken, HRB 12016
Managing Directors: Michael Jung, Markus Neurohr
VAT-ID: DE210373115