场景：boot项目运行时，提示log4j2依赖包冲突。
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/maven/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/maven/repository/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]
解决方案：
1、比较费眼睛的方法:
pom.xml修改引用包排除slf4j-log4j12包.
采用mvn分析树查找引用关系的命令：
#排错引用包继承关系
mvn dependency:tree
在输出的树型关系中找关于"slf4j-log4j12"的字样的引用包
[INFO] +- com.gitee.hsg77:pg-common:jar:1.1:compile
[INFO] | +- junit:junit:jar:4.12:compile
[INFO] | | \- org.hamcrest:hamcrest-core:jar:1.3:compile
[INFO] | +- org.apache.commons:commons-lang3:jar:3.8.1:compile
[INFO] | +- com.alibaba:fastjson:jar:1.2.60:compile
[INFO] | +- com.fasterxml.jackson.core:jackson-databind:jar:2.9.7:compile
[INFO] | | \- com.fasterxml.jackson.core:jackson-core:jar:2.9.7:compile
[INFO] | +- com.github.pagehelper:pagehelper-spring-boot-starter:jar:1.2.5:compile
[INFO] | | +- org.mybatis.spring.boot:mybatis-spring-boot-starter:jar:1.3.2:compile
[INFO] | | | +- org.mybatis.spring.boot:mybatis-spring-boot-autoconfigure:jar:1.3.2:compile
[INFO] | | | +- org.mybatis:mybatis:jar:3.4.6:compile
[INFO] | | | \- org.mybatis:mybatis-spring:jar:1.3.2:compile
[INFO] | | +- com.github.pagehelper:pagehelper-spring-boot-autoconfigure:jar:1.2.5:compile
[INFO] | | \- com.github.pagehelper:pagehelper:jar:5.1.4:compile
[INFO] | +- com.github.jsqlparser:jsqlparser:jar:1.0:compile
[INFO] | +- org.projectlombok:lombok:jar:1.18.4:compile
[INFO] | +- org.springframework.boot:spring-boot-dependencies:pom:2.1.1.RELEASE:import
[INFO] | +- org.springframework:spring-context-support:jar:5.1.3.RELEASE:compile
[INFO] | +- mysql:mysql-connector-java:jar:8.0.13:compile
[INFO] | +- org.xerial:sqlite-jdbc:jar:3.25.2:compile
[INFO] | +- com.oracle:ojdbc6:jar:6.0:compile
[INFO] | +- com.microsoft.sqlserver:sqljdbc4:jar:4.2:compile
[INFO] | +- com.dameng:Dm8JdbcDriver18:jar:8.1.1.49:compile
[INFO] | +- com.h2database:h2:jar:1.4.197:compile
[INFO] | +- com.aliyun.hbase:alihbase-client:jar:1.1.12:compile
[INFO] | | +- com.aliyun.hbase:alihbase-annotations:jar:1.1.12:compile
[INFO] | | +- com.aliyun.hbase:alihbase-common:jar:1.1.12:compile
[INFO] | | | \- org.mortbay.jetty:jetty-util:jar:6.1.26:compile
[INFO] | | +- com.aliyun.hbase:alihbase-protocol:jar:1.1.12:compile
[INFO] | | +- commons-logging:commons-logging:jar:1.2:compile
[INFO] | | +- com.google.protobuf:protobuf-java:jar:2.5.0:compile
[INFO] | | +- io.netty:netty-all:jar:4.1.31.Final:compile
[INFO] | | +- org.apache.zookeeper:zookeeper:jar:3.4.6:compile
[INFO] | | | \- org.slf4j:slf4j-log4j12:jar:1.7.25:compile
最后一行为org.slf4j:slf4j-log4j12:jar:1.7.25:compile
引用来至包com.gitee.hsg77:pg-common:jar:1.1
所以解决办法如下所示：
pom.xml修改引用包排除slf4j-log4j12包
2、下载maven helper 插件
然后进到该pom文件，点击这里
输入搜索冲突的包
找到排除的jar，点击右键【exclude】
