Springboot整合Logback java.lang.IllegalStateException: Logback configuration error detected:

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博客内容涉及Springboot应用启动时遇到的Logback配置错误，具体为找不到名为[FILE]的Appender，提示需检查配置文件中appender的顺序。错误导致应用无法正常启动。解决方法是将异步日志输出的配置放置在文件日志配置的下方。

Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.IllegalStateException: Logback configuration error detected:
ERROR in ch.qos.logback.core.joran.action.AppenderRefAction - Could not find an appender named [FILE]. Did you define it below instead of above in the configuration file?
ERROR in ch.qos.logback.core.joran.action.AppenderRefAction - See http://logback.qos.ch/codes.html#appender_order for more details.
ERROR in ch.qos.logback.classic.AsyncAppender[ASYNC] - No attached appenders found.
   at org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:169)
   at org.springframework.boot.logging.logback.LogbackLoggingSystem.reinitialize(LogbackLoggingSystem.java:222)
   at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithConventions(AbstractLoggingSystem.java:73)
   at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:60)
   at org.springframework.boot.logging.logback.LogbackLoggingSystem.initialize(LogbackLoggingSystem.java:118)
   at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:313)
   at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:288)
   at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:246)
   at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:223)
   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:127)
   at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76)
   at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53)
   at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:345)
   at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)
   at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
   at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
   at com.nice.NiceBbsClientApplication.main(NiceBbsClientApplication.java:18)
   ... 5 more

解决方案:

<!--文件日志， 按照每天生成日志文件 -->
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <!--日志文件输出的文件名-->
        <FileNamePattern>${LOG_HOME}/TestWeb.log.%d{yyyy-MM-dd}.log</FileNamePattern>
        <!--日志文件保留天数-->
        <MaxHistory>30</MaxHistory>
    </rollingPolicy>
    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
        <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符-->
        <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
    </encoder>
    <!--日志文件最大的大小-->
    <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
        <MaxFileSize>10MB</MaxFileSize>
    </triggeringPolicy>
</appender>

<!-- 异步输出 -->
<appender name ="ASYNC" class= "ch.qos.logback.classic.AsyncAppender">
    <!-- 不丢失日志.默认的,如果队列的80%已满,则会丢弃TRACT、DEBUG、INFO级别的日志 -->
    <discardingThreshold >0</discardingThreshold>
    <!-- 更改默认的队列的深度,该值会影响性能.默认值为256 -->
    <queueSize>512</queueSize>
    <!-- 添加附加的appender,最多只能添加一个 -->
    <appender-ref ref ="FILE"/>
</appender>

异步输出要写在文件日志的下面