Spring Boot logging with Log4j2

Question

Written simple POC to prove and test Spring Boot and log4j2 compatibility. Once successful I will move it to real application.

Please refer my POC source code: https://github.com/Dennyss/SpringBootLog4j2POC

I know/read about Spring version and log4j2 compatibility from: How to set up Spring Boot and log4j2 properly?

Found and tried recommendations described here: Spring-Boot logging with log4j2?

But still not working. The problem is that both application logs and Spring logs are printing to console only.

Please refer maven dependencies below (from POC):

 <dependencies>
    <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.springframework.boot</groupId>
        <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
        <version>2.6.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-api</artifactId>
        <version>2.6.2</version>
    </dependency>
</dependencies>

If I don't exclude Spring's logback and don't add boot-starter-log4j2 then application logs are printing to application file but Spring logs are not printing at all. I feel the problem somewhere with dependencies. Appreciate any help.

Chris Nauroth Chris Nauroth · Accepted Answer · 2017-07-14T23:35:05

According to the Spring Boot Logging documentation, the location of the logging configuration file can be specified using the logging.config property. I noticed that your start.sh script is passing -Dlog4j.configurationFile. Normally, this would be sufficient for direct Log4J 2 integration, but Spring Boot uses logging.config.

After switching to this, it writes to the log files:

java -Dlogging.config=/share/LogPOC/log4j2.xml -cp poc.jar:libs/* com.poc.logger.Application

Spring Boot logging with Log4j2

1 Answers