Spring-boot ignoring log4j2.xml file #43580
Description
I am attempting to implement log4j in my spring-boot (3.4.0) app.
My build is done using Gradle. My depedendencies are as such.
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'com.fasterxml.jackson.core:jackson-databind'
implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml'
implementation 'org.postgresql:postgresql'
implementation 'org.springframework.data:spring-data-mongodb:4.4.0'
implementation 'org.springframework.data:spring-data-commons:3.4.0'
implementation 'org.springframework.boot:spring-boot-starter-actuator:3.4.0'
implementation 'org.mongodb:mongodb-driver-sync:5.2.1'
implementation 'org.mongodb:mongodb-driver-core:5.2.1'
implementation 'com.google.code.gson:gson:2.11.0'
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation "me.paulschwarz:spring-dotenv:4.0.0"
implementation 'org.apache.logging.log4j:log4j-mongodb:2.24.3'
implementation "org.springframework.boot:spring-boot-starter-log4j2:3.4.0"
testImplementation 'org.springframework.boot:spring-boot-starter-test'
testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
modules {
module("org.springframework.boot:spring-boot-starter-logging") {
replacedBy("org.springframework.boot:spring-boot-starter-log4j2", "Use Log4j2 instead of Logback")
}
}
Im using the modules approach to replace the spring-boot-starter-logging with the spring-boot-starter-log4j2 module. I have run gradle dependencies and verified that that is happening.
| | | +--- org.springframework.boot:spring-boot-autoconfigure:3.3.5
| | | | \--- org.springframework.boot:spring-boot:3.3.5 (*)
| | | +--- org.springframework.boot:spring-boot-starter-logging:3.3.5 -> org.springframework.boot:spring-boot-starter-log4j2:3.4.0
| | | | +--- org.apache.logging.log4j:log4j-slf4j2-impl:2.24.1 -> 2.23.1
| | | | | +--- org.apache.logging.log4j:log4j-api:2.23.1
| | | | | +--- org.slf4j:slf4j-api:2.0.9 -> 2.0.16
| | | | | \--- org.apache.logging.log4j:log4j-core:2.23.1
| | | | | \--- org.apache.logging.log4j:log4j-api:2.23.1
| | | | +--- org.apache.logging.log4j:log4j-core:2.24.1 -> 2.23.1 (*)
| | | | \--- org.apache.logging.log4j:log4j-jul:2.24.1 -> 2.23.1
| | | | \--- org.apache.logging.log4j:log4j-api:2.23.1
In my log4j2.xml file the config looks like this.
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" monitorInterval="30">
<Properties>
<Property name="LOG_PATTERN">%d{yyyy-MM-dd'T'HH:mm:ss.SSSZ} %p %m%n</Property>
<Property name="APP_LOG_ROOT">c:/temp</Property>
</Properties>
<Appenders>
<Console name="Console" target="SYSTEM_OUT" follow="true">
<PatternLayout pattern="${LOG_PATTERN}" />
</Console>
<RollingFile name="appLog"
fileName="${APP_LOG_ROOT}/SpringBoot2App/application.log"
filePattern="${APP_LOG_ROOT}/SpringBoot2App/application-%d{yyyy-MM-dd}-%i.log">
<PatternLayout pattern="${LOG_PATTERN}" />
<Policies>
<SizeBasedTriggeringPolicy size="19500KB" />
</Policies>
<DefaultRolloverStrategy max="1" />
</RollingFile>
</Appenders>
<Loggers>
<Logger name="com.howtodoinjava.app" additivity="false">
<AppenderRef ref="appLog" />
<AppenderRef ref="Console" />
</Logger>
<Root level="debug">
<AppenderRef ref="Console" />
<AppenderRef ref="appLog" />
</Root>
</Loggers>
</Configuration>
I would have expected spring to fail on startup with this config. Mainly because I am running this on a Mac and the APP_LOG_ROOT value of c:/temp should fail. But instead spring just continues to do it's logging as if the log4j2.xml is never there .
If I force loading of it by setting 'logger.config=classpath:log4j2.xml' in my application.properties then on start I get a bunch of warnings about how logback-classic is still in place, but nothing actually gets logged. The files in the XML config never get created, and I am still unable to control any of the logging.