Axel Howind created PDFBOX-5705:
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             Summary: update log4j dependency to 2.21.0
                 Key: PDFBOX-5705
                 URL: https://issues.apache.org/jira/browse/PDFBOX-5705
             Project: PDFBox
          Issue Type: Improvement
    Affects Versions: 3.0.0 PDFBox
            Reporter: Axel Howind
         Attachments: update_log4j_to_2_21_0.patch

Log4J was updated to version 2.21.0. Just updating the dependency leads to a 
failure when building with Jenkins. This has been discussed on the mailing list.

Currently PDFBox uses Log4J only when running tests and examples. The codebase 
uses commons-logging. When executing tests, logs are rerouted to log4j using 
the jcl-log4j bridge implementation.

PDFBox has to implementations of the commons-logging LogFactory on the 
classpath. After updating, the original commons-logging implementation is 
chosen.

This patch updates log4j to version to 2.21.0 and adds a 
commons-logging.properties file for tests and examples that tells 
commons-logging to use the bridge implementation instead of the original one.



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