Springboot logback-spring.xml无法加载

现象

SpringBoot项目，启动后，日志文件没有出现在logback-spring.xml指定的目录下，且启动日志开头如下：

"C:\Program Files\Java\jdk1.8.0_144\bin\java"...
Connected to the target VM, address: '127.0.0.1:52494', transport: 'socket'
18:34:58,011 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
18:34:58,011 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
18:34:58,011 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [jar:file:/D:/mvn_repo/xxx-1.0.2.jar!/logback.xml]
18:34:58,014 |-INFO in ch.qos.logback.core.joran.spi.ConfigurationWatchList@707194ba - URL [jar:file:/D:/mvn_repo/yyy-1.0.2.jar!/logback.xml] is not of type file
18:34:58,112 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Will scan for changes in [jar:file:/D:/mvn_repo/zzz-1.0.2.jar!/logback.xml] 

logback-spring.xml文件一直未改动过，如下：

    
    


    
        
             %d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{36} %line - %msg%n
        
    

    
        
        
            
            ${logPath}/server.%d.log
        
        
             %d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{36} %line - %msg%n
            UTF-8
        
    

    
        
            ERROR
            ACCEPT
            DENY
        
        
        
            
            ${logPath}/server.%d.error
        
        
             %d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{36} %line - %msg%n
            UTF-8
        
    

    
        
        
        
    

原因分析

1. 配置文件位置正确

classes/
├── application.properties
├── com
│   └── nero
│       └── test
│           ├── api
│           │   ├── Api.class

2. 分析启动日志，分析可能是依赖的jar中有logback.xml配置，冲突导致的问题

解决方案

在application.properties中加入配置：

logging.config=classpath:logback-spring.xml

通过该配置，强制指定日志的配置文件，问题得以解决

参考

Spring 默认日志logback配置解析