logback 에서 spring framework log 가 출력되지 않을때

문제

스프링은 로그 출력을 위해 jakarta commons logging 라이브러리를 사용하고 있다.

그러므로 로그백의 logger 에 org.springframework 을 설정해도 스프링 로그(Bean create등)는 로그백의 appender 에 출력되지 않는다.

해결

pom.xml 에 다음다음 절차를 하나씩 해보고 결과 확인

1. pom.xml 의 스프링 설정을 다음과 같이 commons-logging 의존성을 제거한다.

   <properties>
   	<spring-framework.version>3.2.3.RELEASE</spring-framework.version>
   	<logback.version>1.0.13</logback.version>
   	<slf4j.version>1.7.5</slf4j.version>
   </properties>
    
   <dependency>
   	<groupId>org.springframework</groupId>
   	<artifactId>spring-context</artifactId>
   	<version>${spring-framework.version}</version>
   	<exclusions>
   	   <exclusion>
   		  <groupId>commons-logging</groupId>
   		  <artifactId>commons-logging</artifactId>
   	   </exclusion>
   	</exclusions>			
   </dependency>

2. logback 과 slf4j 설정

   <!-- LogBack dependencies --> 
   <dependency>
   	<groupId>ch.qos.logback</groupId>
   	<artifactId>logback-classic</artifactId>
   	<version>${logback.version}</version>
   </dependency>
   <dependency>                                    
   	<groupId>org.slf4j</groupId>                
   	<artifactId>jcl-over-slf4j</artifactId>     
   	<version>${slf4j.version}</version>  
   </dependency>

3. logback.xml 생성

   <?xml version="1.0" encoding="UTF-8"?>
   <configuration scan="true" scanPeriod="30 seconds">
    
   <property name="LOG_HOME" value="logs" />
    	<property name="LOG_PATTERN" value="%logger{36} %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"/>
   	<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
   		<file>${LOG_HOME}/test-web-app.log</file>
   		<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
   			<!-- daily rollover -->
   			<fileNamePattern>${LOG_HOME}/test-web-app.log.%d{yyyy-MM-dd}.log</fileNamePattern>
   			<!-- keep 30 days' worth of history -->
   			<maxHistory>30</maxHistory>
   		</rollingPolicy>
   		<encoder>
   			<pattern>${LOG_PATTERN}</pattern>
   		</encoder>
   	</appender>
   	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
   		<encoder>
   			<pattern>
   				${LOG_PATTERN}
   			</pattern>
   		</encoder>
   	</appender>
   	<logger name="org.springframework" level="DEBUG" >
   		<appender-ref ref="STDOUT" />
   		<appender-ref ref="FILE" />
   	</logger>
    	
   	<!-- turn OFF all logging (children can override) -->
   	<root level="INFO">
   		<appender-ref ref="STDOUT" />
   		<appender-ref ref="FILE" />
   	</root>
   </configuration>

4. 정상 동작 여부를 확인한다.

Ref

• http://www.codingpedia.org/ama/how-to-log-in-spring-with-slf4j-and-logback/
• http://stackoverflow.com/questions/20823409/spring-logging-threshold-not-being-set-by-logback
• http://stackoverflow.com/questions/16355312/logback-logging-not-working
• http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/overview.html 의 Using SLF4J 항목