Caused by: org.apache.logging.log4j.LoggingException: log4j-slf4j-impl cannot be present with log4j-to-slf4j

Question

In my Spring boot 2 project:

In build.gradle:

dependencies {
    implementation \'com.google.code.gson:gson:2.7\'
    imple         


        

Answer 1

According with Spring's documentation (as pointed by Simon), we wave to exclude the "spring-boot-starter-logging" module from all libraries, not only from "spring-boot-starter-web".

configurations {
    ...
    all {
        exclude group: 'org.springframework.boot', module: 'spring-boot-starter-logging'
    }
}

...instead of...

dependencies {
    ...
    implementation('org.springframework.boot:spring-boot-starter') {
        exclude group: 'org.springframework.boot', module: 'spring-boot-starter-logging'
    }
}

Just had myself the same problem and solved with this solution.