spring boot SLF4J: Class path contains multiple SLF4J bindings 问题解决方法

问题描述

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/xxxxxx/repository/ch/qos/logback/logback-classic/1.1.9/logback-classic-1.1.9.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/xxxxxxxx/org/slf4j/slf4j-log4j12/1.7.25/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]

分析原因

大致意思就是两个jar包里面的类重名，引起了冲突，jvm不知道该用哪一个。

问题解决

我用的是slf4j+log4j的组合，所以我选择不加载spring boot自带的logback。

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
            <exclusions>
                <exclusion>
                    <artifactId>logback-classicartifactId>
                    <groupId>ch.qos.logbackgroupId>
                exclusion>
                <exclusion>
                    <artifactId>log4j-over-slf4jartifactId>
                    <groupId>org.slf4jgroupId>
                exclusion>
            exclusions>
        dependency>

参考文章

https://stackoverflow.com/questions/33071002/spring-boot-multiple-slf4j-bindings/33962453
https://www.slf4j.org/codes.html#multiple_bindings