I am developing a Keycloak SPI (Service Provider Interface) and need to log specific events to a different file using SLF4J markers. However, I am facing issues integrating Logback with Keycloak's default Quarkus logging system.

My setup: Keycloak uses Quarkus, which has its own built-in logging system. I am trying to use Logback to handle logging in my SPI. I placed a logback.xml file inside src/main/resources/. However, my logs are still printed using the default Quarkus logger instead of Logback. Project structure:

my-custom-spi/
├── src/
│   ├── main/
│   │   ├── java/
│   │   │   └── com/example/
│   │   │       └── MyCustomProvider.java
│   │   └── resources/
│   │       └── logback.xml
│   └── test/
│       └── java/
├── build.gradle
└── build/
    └── libs/
        └── my-custom-spi.jar 

build.gradle:

plugins {
    id 'java'
}

repositories {
    mavenCentral()
}

dependencies {
    // Keycloak SPI dependencies
    implementation '.keycloak:keycloak-core:21.1.2'
    implementation '.keycloak:keycloak-server-spi:21.1.2'
    implementation '.keycloak:keycloak-server-spi-private:21.1.2'

    // Logback dependencies
    implementation 'ch.qos.logback:logback-classic:1.2.11' // Logback implementation
    implementation '.slf4j:slf4j-api:1.7.36' // SLF4J API
}

jar {
    archiveFileName = 'my-custom-spi.jar'
}

Issue: Even after adding Logback dependencies and placing logback.xml in src/main/resources, the logs still appear in the default Quarkus logging format seems like logback has no effect SLF4J logs don't seem to be routed through Logback.

Question: How can I configure Logback in a Keycloak SPI so that specific logs (using SLF4J markers) go to a separate file? Do I need to disable Quarkus logging or perform additional configurations to make Logback work? Is there a way to force Keycloak to use Logback instead of the default Quarkus logger? Any insights or working solutions would be appreciated!