SpringBoot集成log4j后报错SLF4J: Class path contains multiple SLF4J bindings..._class path contains multiple slf4j providers.-优快云博客

本文介绍在SpringBoot项目中集成log4j时，如何避免与默认logback发生冲突，通过在pom.xml中排除logback依赖，确保项目正常启动。

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现象：
- SpringBoot集成log4j后，项目启动可能会报错类似以下：
  
  SLF4J: Class path contains multiple SLF4J bindings…
原因：

log4j与SpringBoot默认的logback冲突，导致启动报错

解决方法：

在pom.xml中排除logback:

<dependencies>   
    <dependency>      
        <groupId>org.springframework.boot</groupId>      
        <artifactId>spring-boot-starter-web</artifactId>      
        <exclusions>         
            <exclusion>            
                <groupId>org.springframework.boot</groupId>            
                <artifactId>spring-boot-starter-logging</artifactId>         
            </exclusion>         
            <exclusion>            
                <groupId>org.springframework.boot</groupId>            
                <artifactId>spring-boot-starter-logback</artifactId>         
            </exclusion>      
        </exclusions>   
    </dependency>   
    <dependency>      
        <groupId>org.springframework.boot</groupId>      
        <artifactId>spring-boot-starter-tomcat</artifactId>      
        <scope>provided</scope>      
        <exclusions>         
            <exclusion>            
                <groupId>org.springframework.boot</groupId>            
                <artifactId>spring-boot-starter-logging</artifactId>         
            </exclusion>         
            <exclusion>            
                <groupId>org.springframework.boot</groupId>            
                <artifactId>spring-boot-starter-logback</artifactId>         
            </exclusion>      
        </exclusions>   
    </dependency>   
    <dependency>      
        <groupId>org.springframework.boot</groupId>      
        <artifactId>spring-boot-starter-test</artifactId>      
        <scope>test</scope>      
        <exclusions>         
            <exclusion>            
                <groupId>org.springframework.boot</groupId>            
                <artifactId>spring-boot-starter-logging</artifactId>         
            </exclusion>         
            <exclusion>            
                <groupId>org.springframework.boot</groupId>            
                <artifactId>spring-boot-starter-logback</artifactId>         
            </exclusion>      
        </exclusions>   
    </dependency>