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Add support for optional Log4J2 configuration

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This commit adds support for the standard 'optional:' prefix in Log4j2
override file locations, ensuring missing files are ignored without
throwing exceptions.

See gh-44488

Signed-off-by: Dmytro Nosan <dimanosan@gmail.com>
This commit is contained in:
Dmytro Nosan
2025-02-26 22:41:45 +02:00
committed by Stéphane Nicoll
parent 93dc0fb224
commit 48154a393f
3 changed files with 89 additions and 14 deletions
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spring-boot-project/spring-boot-docs/src/docs/antora/modules/how-to/pages/logging.adoc
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@@ -201,3 +201,5 @@ To configure Log4j 2 to use an alternative configuration file format, add the ap
Log4j 2 has support for combining multiple configuration files into a single composite configuration.
To use this support in Spring Boot, configure configprop:logging.log4j2.config.override[] with the locations of one or more secondary configuration files.
The secondary configuration files will be merged with the primary configuration, whether the primary's source is Spring Boot's defaults, a standard location such as `log4j.xml`, or the location configured by the configprop:logging.config[] property.
NOTE: Log4j2 override configuration file locations can be prefixed with `optional:`, for example, `optional:classpath:log4j2-override.xml`, to indicate that the location is optional and should only be loaded if the resource exists.