Spring Boot with log4j2 not working when change default properties file name - spring-boot

Question

I have Spring Boot application and I want to use log4j2 instead of logback. I've already done all the necessary steps to exclude spring-boot-starter-logging from spring-boot-starter-web and added spring-boot-starter-log4j2 dependency.
When I add log4j2.properties file under resources folder it works correct and I can see logs.
But when I change file name to, lets say log4j2-demo.properties and set logging.config=classpath:log4j2-demo.properties nothing prints to console. For testing purpose I've set different name for lo4gj2 file in logging.config and it gives error with file not found and I think logging.config property actually working and reading my properties file.
application.properties file:
spring.profiles.active=dev
application-dev.properties file:
logging.config=classpath:log4j2-demo.properties
log4j2 properties file:
status=debug
name=PropertiesConfig
#
filters=threshold
#
filter.threshold.type=ThresholdFilter
filter.threshold.level=debug
#
appenders=console
#
appender.console.type=Console
appender.console.name=STDOUT
appender.console.layout.type=PatternLayout
appender.console.layout.pattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
#
rootLogger.level=info
rootLogger.appenderRefs=stdout
rootLogger.appenderRef.stdout.ref=STDOUT
my application structure:
src
main
java
resources
application.properties
application-dev.properties
log4j2-demo.properties
pom.xml :
...
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.graylog2.log4j2</groupId>
<artifactId>log4j2-gelf</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.zalando/logbook-spring-boot-starter -->
<dependency>
<groupId>org.zalando</groupId>
<artifactId>logbook-spring-boot-starter</artifactId>
<version>2.0.0</version>
</dependency>
...

Answer 1

If you use log4j 2.13.0 you can use profiles to define log4j 2 system properties in your spring configuration. So you could have:
application-dev.properties
log4j2.configurationFile=log4j2-demo.properties.
Log4j 2.13.0 also supports placing the log4j 2 configuration file in Spring Cloud Config.

Answer 2

I'm not sure if this answer applies to this question, but in my case, I added the resource to the build configuration on my pom.xml, e.g.
...
<build>
...
<resources>
<resource>
<directory>${basedir}/src/main/resources</directory>
<filtering>true</filtering>
<includes>
<include>**/*.xml</include> <!-- or **/*.properties -->
</includes>
</resource>
</resources>
...
</build>
...
Of course, I excluded spring-boot-starter-logging from spring-boot-starter-web and spring-boot-starter-actuator
...
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
...
Although, I used the default log4j2 file name log4j2.xml and the step configuration on the application.yml was not required, I mean this configuration logging.config=classpath:log4j2-demo.properties