member sound created LOG4J2-3422:
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Summary: Prevent setting Log4j2CloudConfigLoggingSystem as
tomcat-wide system property using log4j-spring-boot
Key: LOG4J2-3422
URL: https://issues.apache.org/jira/browse/LOG4J2-3422
Project: Log4j 2
Issue Type: Improvement
Affects Versions: 2.17.1
Environment: spring-boot-2.6.4, log4j2-2.17.1
Reporter: member sound
Follow-Up issue from discussion in
https://github.com/spring-projects/spring-boot/issues/30017
Setting: Tomcat 9 Standalone Server with *multiple* independent spring-boot
applications.
Problem: as soon as one of those applications adds {{log4j-spring-boot}}
dependency, then *all* applications running on the same tomcat are forced to
add this dependency.
This seems to be because:
{code}
org.springframework.boot.logging.LoggingSystem=org.apache.logging.log4j.spring.boot.Log4j2CloudConfigLoggingSystem
{code}
https://github.com/apache/logging-log4j2/blob/f72100df0decc9bda96b4d769822c4e48b2848fc/log4j-spring-boot/src/main/resources/log4j2.system.properties#L17
https://github.com/apache/logging-log4j2/blob/release-2.x/log4j-spring-boot/src/main/java/org/apache/logging/log4j/spring/boot/Log4j2CloudConfigLoggingSystem.java
This is even worse of other applications would normally rely on the
spring-default logback logging framework. They are then forced to switch to
Log4j2.
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