How to resolve conflicts between log4j and logback?

When log4j conflicts with logback, the issue can be resolved using the following methods:

1. Exclude conflict dependencies: Exclude the log4j related dependencies that conflict with logback in the project’s dependencies. This can be done by adding the following configuration to the pom.xml file.

<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>xxx</version>
    <exclusions>
        <exclusion>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
        </exclusion>
    </exclusions>
</dependency>

1. To configure the bridge: logback provides a bridge (logback-classic) that allows log4j log events to be forwarded to logback. This can be achieved by adding logback-classic dependency to the project’s dependencies.

<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>xxx</version>
</dependency>

1. Modify the configuration file: Change the configuration items in the log4j configuration file (log4j.properties or log4j.xml) to logback configuration items. Refer to the logback documentation for guidance on configuration.
2. Restart the application: If the above methods do not work, you can try restarting the application to ensure that only one logging framework is running.

It’s important to note that resolving conflicts may affect other parts of the application, so make sure you have a thorough understanding of the project and conduct adequate testing before making any modifications.