【异常解决】logback配置文件报错：no applicable action for [maxFileSize], current ElementPath is [[configuration]

logback 是 SpringBoot 开发过程中常用的日志工具，在使用前需要设置配置参数，一般写在 logback-spring.xml 文件中。

一、现象描述

配置完 logback-spring.xml 文件后，运行报错，内容为：

Caused by: java.lang.IllegalStateException: java.lang.IllegalStateException: Logback configuration error detected: 
ERROR in ch.qos.logback.core.joran.spi.Interpreter@48:26 - no applicable action for [maxFileSize], current ElementPath  is [[configuration][appender][rollingPolicy][maxFileSize]]
	at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:344)
	at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:298)
	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:176)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:131)
	at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:85)
	at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:66)
	at java.util.ArrayList.forEach(ArrayList.java:1257)
	at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:120)
	at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:114)
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:65)
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:343)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:301)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292)
	at com.lxkj.iotp.Application.main(Application.java:16)
	... 5 more
Caused by: java.lang.IllegalStateException: Logback configuration error detected: 
ERROR in ch.qos.logback.core.joran.spi.Interpreter@48:26 - no applicable action for [maxFileSize], current ElementPath  is [[configuration][appender][rollingPolicy][maxFileSize]]
	at org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:179)
	at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithConventions(AbstractLoggingSystem.java:80)
	at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:60)
	at org.springframework.boot.logging.logback.LogbackLoggingSystem.initialize(LogbackLoggingSystem.java:132)
	at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:329)
	... 23 more
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二、原因分析

根据上面报错内容，翻译后提示很明显了，no applicable action for [maxFileSize]，就是[maxFileSize]没有合适的操作与之匹配了。换言之，就是新版的 logback 已经不支持 [maxFileSize] 设置项了。

三、解决方案

将 标签换成 即可，如图所示。

<appender name="file_error" class="ch.qos.logback.core.rolling.RollingFileAppender">
	    <file>${log.path}/sys-error.log</file>
        <!-- 循环政策：基于时间创建日志文件 -->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 日志文件名格式 -->
            <fileNamePattern>${log.path}/sys-error.%d{yyyy-MM-dd}.log</fileNamePattern>
			<!-- 日志最大的历史天数 -->
			<maxHistory>${log.max.history}</maxHistory>
            <!-- 日志文件的最大大小 -->
            <maxFileSize>1GB</maxFileSize>
        </rollingPolicy>
        <encoder>
            <pattern>${log.pattern}</pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <!-- 过滤的级别 -->
            <level>ERROR</level>
			<!-- 匹配时的操作：接收（记录） -->
            <onMatch>ACCEPT</onMatch>
			<!-- 不匹配时的操作：拒绝（不记录） -->
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>
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如下图所示：

本文完结！