报错8_引入Sl4j-log4j12报错 Class path contains multiple SLF4J bindings.

报错

SpringBoot版本2.6.7，pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.7</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>henu.soft</groupId>
    <artifactId>study_nebula_graph_demo</artifactId>
    <version>0.0.1</version>
    <name>study_nebula_graph_demo</name>
    <description>SpringBoot整合nebula图数据库</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>


<!--        nebula客户端-->
        <dependency>
            <groupId>com.vesoft</groupId>
            <artifactId>client</artifactId>
            <version>3.0.0</version>
        </dependency>

<!--        fastjson-->

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.78</version>
        </dependency>

<!--        sl4j日志相关-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.30</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>



        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/E:/Maven/MavenLocalRepository/maven_repository/org/slf4j/slf4j-log4j12/1.7.30/slf4j-log4j12-1.7.30.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/E:/Maven/MavenLocalRepository/maven_repository/ch/qos/logback/logback-classic/1.2.11/logback-classic-1.2.11.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 [org.slf4j.impl.Log4jLoggerFactory]

问题分析

multiple SLF4J bindings.可以看出是sl4j相关的依赖冲突，我们知道sl4j是springboot starter内置的日志门面，具体的实现有logback、log4j、log4j2等，我们引入的是slf4j-log4j12和某些依赖中内置的日志相关的实现冲突了，解决办法就是找出依赖冲突的地方，然后多余的冲突的依赖，参考：https://www.baeldung.com/slf4j-classpath-multiple-bindings

可以使用 mvn dependency:tree 进行本项目依赖树的查看，没有该插件会自行安装。

解决

直接移除我们引入的slf4j-log4j12即可，使用springboot-starter-logging依赖的实现logback即可

<!--        sl4j日志相关-->
<!--        <dependency>-->
<!--            <groupId>org.slf4j</groupId>-->
<!--            <artifactId>slf4j-log4j12</artifactId>-->
<!--            <version>1.7.30</version>-->
<!--        </dependency>-->

成功解决不在报错