【Log4j】 SpringBoot项目报错读取两个 StaticLoggerBinder

第一种报错：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/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:/C:/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.11.2/log4j-slf4j-impl-2.11.2.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]
Logging system failed to initialize using configuration from 'classpath:log4j2-dev.xml'
java.lang.IllegalStateException: Logback configuration error detected: 
ERROR in ch.qos.logback.core.joran.spi.Interpreter@7:17 - no applicable action for [Properties], current ElementPath  is [[configuration][Properties]]
ERROR in ch.qos.logback.core.joran.spi.Interpreter@8:35 - no applicable action for [Property], current ElementPath  is [[configuration][Properties][Property]]
ERROR in ch.qos.logback.core.joran.spi.Interpreter@9:40 - no applicable action for [Property], current ElementPath  is [[configuration][Properties][Property]]
ERROR in ch.qos.logback.core.joran.spi.Interpreter@10:41 - no applicable action for [Property], current ElementPath  is [[configuration][Properties][Property]]
ERROR in ch.qos.logback.core.joran.spi.Interpreter@13:16 - no applicable action for [appenders], current ElementPath  is [[configuration][appenders]]
ERROR in ch.qos.logback.core.joran.spi.Interpreter@15:53 - no applicable action for [console], current ElementPath  is [[configuration][appenders][console]]

• 重点信息
  SLF4J: Class path contains multiple SLF4J bindings.
Logback configuration error detected
• 分析
  仔细看日志，发现日志框架用的是 logback 的包
  SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
  但是项目里配置的Log4j2的配置：
  'classpath:log4j2-dev.xml'
  所以我们需要排除掉 logback ，跑 Log4j2的包

在IDEA的Maven Helper插件中搜索logback的坐标：


发现 logback 被包含在 spring-boot-starter-test 中，在POM文件中找到该坐标把 logback 排除即可

<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-testartifactId>
    <scope>testscope>
    <exclusions>
       <exclusion>
           <artifactId>spring-boot-starter-loggingartifactId>
           <groupId>org.springframework.bootgroupId>
       exclusion>
    exclusions>
dependency>

第二种报错：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.11.2/log4j-slf4j-impl-2.11.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.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]
java.lang.StackOverflowError
	at org.apache.logging.log4j.util.StackLocator.getCallerClass(StackLocator.java:108)
	at org.apache.logging.log4j.util.StackLocator.getCallerClass(StackLocator.java:121)
	at org.apache.logging.log4j.util.StackLocatorUtil.getCallerClass(StackLocatorUtil.java:55)
	at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:42)
	at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
	at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358)

• 重点信息
  SLF4J: Class path contains multiple SLF4J bindings.
java.lang.StackOverflowError
• 分析
  这里看报错的日志，发现是加载了两个 slf4j-impl 的 Log4jLoggerFactory 所以导致了 StackOverflowError，因此我们需要排除其中的一个 slf4j-impl 的包
  同上面的，在IDEA的Maven Helper插件中搜索slf4j-impl的坐标，然后在POM文件中找到该坐标把 logback 排除即可

<exclusions>
	  <exclusion>
	      <groupId>org.springframework.bootgroupId>
	      <artifactId>spring-boot-starter-log4j2artifactId>
	  exclusion>
exclusions>