class org.apache.logging.slf4j.Log4jLogger cannot be cast to class ch.qos.logback.classic.Logger about logback

[notxndy]

I see such a jar is compiled under the following dependency

`[INFO] - org.springframework.boot:spring-boot-starter-log4j2:jar:2.7.11:compile

[INFO] +- org.apache.logging.log4j:log4j-slf4j-impl:jar:2.18.0:compile`

Will exclude it and post results.

[ceki]

SLF4J 2.x requires logback 1.3 or later.

[notxndy]

Right but 1.3 and above breaks the casting.

[ceki]

It should not. What is the exception?

[notxndy]

As the title reads: java.lang.ClassCastException: class org.apache.logging.slf4j.Log4jLogger cannot be cast to class ch.qos.logback.classic.Logger

Edit: With the following in my maven pom file dependencymanagement:

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>2.0.9</version>
    </dependency>

    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.3.0</version>
        <scope>test</scope>
    </dependency>

[ceki]

org.apache.logging.slf4j.Log4jLogger ships with log4j-slf4j-impl module, part of log4j 2.x project. Thus, you surely have log4j-slf4j-impl.jar in your class path which is causing the cast exception.

[notxndy]

For some reason I wasn't able to exclude from the dependency tree. But I'm sure this is still an acceptable answer.

[ceki]

qos-ch/slf4j#415 (comment) is closely related.