问题报错

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/liao/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.15.0/log4j-slf4j-impl-2.15.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/liao/.m2/repository/org/slf4j/slf4j-log4j12/1.6.1/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/liao/.m2/repository/ch/qos/logback/logback-classic/1.2.4/logback-classic-1.2.4.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.apache.logging.slf4j.Log4jLoggerFactory]
Exception in thread "main" java.lang.ExceptionInInitializerError
	at com.baomidou.mybatisplus.generator.config.builder.Entity$Builder.<init>(Entity.java:333)
	at com.baomidou.mybatisplus.generator.config.StrategyConfig.<init>(StrategyConfig.java:116)
	at com.baomidou.mybatisplus.generator.config.StrategyConfig.<init>(StrategyConfig.java:35)
	at com.baomidou.mybatisplus.generator.config.StrategyConfig$Builder.<init>(StrategyConfig.java:379)
	at com.baomidou.mybatisplus.generator.FastAutoGenerator.<init>(FastAutoGenerator.java:75)
	at com.baomidou.mybatisplus.generator.FastAutoGenerator.create(FastAutoGenerator.java:85)
	at com.xiaomi.browser.miuibn.operation.MybatisPlusCodeGene.main(MybatisPlusCodeGene.java:24)
Caused by: org.apache.logging.log4j.LoggingException: log4j-slf4j-impl cannot be present with log4j-to-slf4j
	at org.apache.logging.slf4j.Log4jLoggerFactory.validateContext(Log4jLoggerFactory.java:60)
	at org.apache.logging.slf4j.Log4jLoggerFactory.newLogger(Log4jLoggerFactory.java:44)
	at org.apache.logging.slf4j.Log4jLoggerFactory.newLogger(Log4jLoggerFactory.java:33)
	at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:53)
	at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:33)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
	at com.baomidou.mybatisplus.generator.config.builder.Entity.<clinit>(Entity.java:48)
	... 7 more

此类日志是出现依赖冲突的常见形式，从日志中我们可以看到Caused by: org.apache.logging.log4j.LoggingException: log4j-slf4j-impl cannot be present with log4j-to-slf4j我们能大概看到，是log4j日志组件出现了问题。虽然从Cause by得出一点信息，但最想要解决问题，还是得从warning入手。

因为只有得知了，产生冲突的是那些jar，才能想办法排除，回到报错开头：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/liao/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.15.0/log4j-slf4j-impl-2.15.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/liao/.m2/repository/org/slf4j/slf4j-log4j12/1.6.1/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/liao/.m2/repository/ch/qos/logback/logback-classic/1.2.4/logback-classic-1.2.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]

上述两中放到，最主要的是得到依赖的artifactId 与groupId，例如上面的jar的分别是org.apache.logging.log4j和log4j-slf4j-impl，得出所以冲突包后，只需要在pom中添加如下内容即可解决。

 <!-- 解决日志冲突 -->
 <dependency>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j-slf4j-impl</artifactId>
     <version>2.17.0</version>
     <exclusions>
         <exclusion>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
         </exclusion>
         <exclusion>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
         </exclusion>
     </exclusions>
 </dependency>

再运行，就解决了依赖冲突的问题。对于这种类型的冲突，理论上，都可以采用此种方法解决。

Reference