完美解決Logback configuration error detected的問題
今天在springboot項目中替換log4j2日志的時候遇見的問題，閑話不多說。
錯誤日志
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@3:16 - no applicable action for [appenders], current ElementPath is [[configuration][appenders]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@4:67 - no applicable action for [Console], current ElementPath is [[configuration][appenders][Console]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@5:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][Console][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@10:119 - no applicable action for [RollingFile], current ElementPath is [[configuration][appenders][RollingFile]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@11:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][RollingFile][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@12:23 - no applicable action for [Policies], current ElementPath is [[configuration][appenders][RollingFile][Policies]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@13:45 - no applicable action for [TimeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][TimeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@14:57 - no applicable action for [SizeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][SizeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@16:48 - no applicable action for [DefaultRolloverStrategy], current ElementPath is [[configuration][appenders][RollingFile][DefaultRolloverStrategy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@21:79 - no applicable action for [RollingFile], current ElementPath is [[configuration][appenders][RollingFile]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@22:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][RollingFile][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@23:23 - no applicable action for [Policies], current ElementPath is [[configuration][appenders][RollingFile][Policies]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@24:45 - no applicable action for [TimeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][TimeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@25:57 - no applicable action for [SizeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][SizeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@27:48 - no applicable action for [DefaultRolloverStrategy], current ElementPath is [[configuration][appenders][RollingFile][DefaultRolloverStrategy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@28:79 - no applicable action for [ThresholdFilter], current ElementPath is [[configuration][appenders][RollingFile][ThresholdFilter]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@32:14 - no applicable action for [loggers], current ElementPath is [[configuration][loggers]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@36:64 - no applicable action for [logger], current ElementPath is [[configuration][loggers][logger]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@37:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@38:43 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@39:44 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@43:77 - no applicable action for [logger], current ElementPath is [[configuration][loggers][logger]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@44:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@50:28 - no applicable action for [root], current ElementPath is [[configuration][loggers][root]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@52:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@53:43 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@54:44 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] at org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:162) at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:66) at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:56) at org.springframework.boot.logging.logback.LogbackLoggingSystem.initialize(LogbackLoggingSystem.java:114) at org.springframework.boot.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:309) at org.springframework.boot.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:277) at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:240) at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:213) at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122) at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:74) at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54) at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:325) at org.springframework.boot.SpringApplication.run(SpringApplication.java:296) at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:121) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189) at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189) at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) Caused by: java.lang.IllegalStateException: java.lang.IllegalStateException: Logback configuration error detected: ERROR in ch.qos.logback.core.joran.spi.Interpreter@3:16 - no applicable action for [appenders], current ElementPath is [[configuration][appenders]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@4:67 - no applicable action for [Console], current ElementPath is [[configuration][appenders][Console]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@5:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][Console][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@10:119 - no applicable action for [RollingFile], current ElementPath is [[configuration][appenders][RollingFile]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@11:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][RollingFile][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@12:23 - no applicable action for [Policies], current ElementPath is [[configuration][appenders][RollingFile][Policies]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@13:45 - no applicable action for [TimeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][TimeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@14:57 - no applicable action for [SizeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][SizeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@16:48 - no applicable action for [DefaultRolloverStrategy], current ElementPath is [[configuration][appenders][RollingFile][DefaultRolloverStrategy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@21:79 - no applicable action for [RollingFile], current ElementPath is [[configuration][appenders][RollingFile]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@22:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][RollingFile][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@23:23 - no applicable action for [Policies], current ElementPath is [[configuration][appenders][RollingFile][Policies]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@24:45 - no applicable action for [TimeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][TimeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@25:57 - no applicable action for [SizeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][SizeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@27:48 - no applicable action for [DefaultRolloverStrategy], current ElementPath is [[configuration][appenders][RollingFile][DefaultRolloverStrategy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@28:79 - no applicable action for [ThresholdFilter], current ElementPath is [[configuration][appenders][RollingFile][ThresholdFilter]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@32:14 - no applicable action for [loggers], current ElementPath is [[configuration][loggers]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@36:64 - no applicable action for [logger], current ElementPath is [[configuration][loggers][logger]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@37:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@38:43 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@39:44 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@43:77 - no applicable action for [logger], current ElementPath is [[configuration][loggers][logger]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@44:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@50:28 - no applicable action for [root], current ElementPath is [[configuration][loggers][root]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@52:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@53:43 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@54:44 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] at org.springframework.boot.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:316) at org.springframework.boot.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:277) at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:240) at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:213) at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122) at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:74) at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54) at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:325) at org.springframework.boot.SpringApplication.run(SpringApplication.java:296) at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:121) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) ... 24 more Caused by: java.lang.IllegalStateException: Logback configuration error detected: ERROR in ch.qos.logback.core.joran.spi.Interpreter@3:16 - no applicable action for [appenders], current ElementPath is [[configuration][appenders]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@4:67 - no applicable action for [Console], current ElementPath is [[configuration][appenders][Console]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@5:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][Console][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@10:119 - no applicable action for [RollingFile], current ElementPath is [[configuration][appenders][RollingFile]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@11:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][RollingFile][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@12:23 - no applicable action for [Policies], current ElementPath is [[configuration][appenders][RollingFile][Policies]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@13:45 - no applicable action for [TimeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][TimeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@14:57 - no applicable action for [SizeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][SizeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@16:48 - no applicable action for [DefaultRolloverStrategy], current ElementPath is [[configuration][appenders][RollingFile][DefaultRolloverStrategy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@21:79 - no applicable action for [RollingFile], current ElementPath is [[configuration][appenders][RollingFile]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@22:96 - no applicable action for [PatternLayout], current ElementPath is [[configuration][appenders][RollingFile][PatternLayout]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@23:23 - no applicable action for [Policies], current ElementPath is [[configuration][appenders][RollingFile][Policies]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@24:45 - no applicable action for [TimeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][TimeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@25:57 - no applicable action for [SizeBasedTriggeringPolicy], current ElementPath is [[configuration][appenders][RollingFile][Policies][SizeBasedTriggeringPolicy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@27:48 - no applicable action for [DefaultRolloverStrategy], current ElementPath is [[configuration][appenders][RollingFile][DefaultRolloverStrategy]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@28:79 - no applicable action for [ThresholdFilter], current ElementPath is [[configuration][appenders][RollingFile][ThresholdFilter]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@32:14 - no applicable action for [loggers], current ElementPath is [[configuration][loggers]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@36:64 - no applicable action for [logger], current ElementPath is [[configuration][loggers][logger]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@37:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@38:43 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@39:44 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@43:77 - no applicable action for [logger], current ElementPath is [[configuration][loggers][logger]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@44:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][logger][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@50:28 - no applicable action for [root], current ElementPath is [[configuration][loggers][root]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@52:42 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@53:43 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] ERROR in ch.qos.logback.core.joran.spi.Interpreter@54:44 - no applicable action for [appender-ref], current ElementPath is [[configuration][loggers][root][appender-ref]] at org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:162) at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:66) at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:56) at org.springframework.boot.logging.logback.LogbackLoggingSystem.initialize(LogbackLoggingSystem.java:114) at org.springframework.boot.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:309) ... 38 more Disconnected from the target VM, address: '127.0.0.1:65035', transport: 'socket' Process finished with exit code -1
首先我們看上面的錯誤日志
Logging system failed to initialize using configuration from 'classpath:log4j2-dev.xml' java.lang.IllegalStateException: Logback configuration error detected:
如果隻看這兩句的話我們可能會認為是我們的日志文件log4j2-dev.xml配置錯瞭，或者路徑找不到，其實不然。正解是我們pom文件配置的有問題，jar包存在沖突，下面來看下我們的pom文件吧
pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
上面的pom文件是最初報錯時的配置文件，看上面的配置文件貌似沒有問題，我們需使用log4j2日志的starter也已經引入瞭，但是這裡我們需要註意一點就是我們在引入spring-boot-starter-web包的時候他裡面默認使用瞭logback日志，這樣就會產生日志包的沖突，其實不隻是starter-web包默認引入的logback還有很多的包默認引入的logback包，看下圖
上圖中是這個pom文件的jiar包結構示意圖，log4j2部分就是我們新引入的spring-boot-starter-log4j2包，上圖中我通過黃線畫出瞭現在系統中所有logback的引入，可以看出所有引用，這裡涉及到幾個包，分別是web包，mybatis包，jdbc包。那我們現在要解決jar包沖突的問題是不是需要每個包下都排除默認引用的logger日志呢，理論上是完全沒有問題的，但是那樣豈不是很費事，2種解決辦法。
解決辦法1
統一排除
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
解決辦法2
那我隻導用瞭web包，不想導入spring-boot-starter能不能解決呢？
答 ： 能
<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>
</exclusions>
</dependency>
看見第二個解決辦法，問題是不是來瞭。很多包都默認使用的logback,你單獨排除瞭web包是不是還會出現這個問題，
答 ： 是的會出現，這裡就需要知道pom文件的加載順序瞭，pom文件的加載順序也是從上至下執行，那麼我們就需要把web包放到pom文件中的第一位，在向下執行的時候也會排除所有的默認logger瞭。
上面就是兩種解決辦法。希望能給大傢一個參考，也希望大傢多多支持WalkonNet。
推薦閱讀：
- springboot 使用logback啟動報警報錯的解決
- springboot logback如何從apollo配置中心讀取變量
- 基於Springboot使用logback的註意事項
- 在SpringBoot中註入RedisTemplate實例異常的解決方案
- springBoot Junit測試用例出現@Autowired不生效的解決