2. 程式人生 > >使用Log4J2.properties作為Spring Boot的日誌工具

使用Log4J2.properties作為Spring Boot的日誌工具

阿新 • • 發佈：2019-01-22

Spring Boot 的官網教材 說可以使用 Log4J 作為日誌工具，但是並沒有給出詳細的說明，也陸續找了下網友的例子，跟著上面做，在 application.properties 裡註冊了 log4j2.xml （注意不是 log4j.properties），執行 Spring Boot 的 main 方法報錯，說找不到 org.apache.log4j.Priority ：出錯日誌如下：

Caused by: java.lang.NoClassDefFoundError: org.apache.log4j.Priority
	at java.lang.Class.forNameImpl(Native Method) ~[?:1.8.0-internal]
	at java.lang.Class.forName(Class.java:273) ~[?:1.8.0-internal]
	at com.alibaba.druid.util.Utils.loadClass(Utils.java:222) ~[druid-1.0.25.jar:1.0.25]
	at com.alibaba.druid.filter.FilterManager.loadFilter(FilterManager.java:104) ~[druid-1.0.25.jar:1.0.25]
	at com.alibaba.druid.pool.DruidAbstractDataSource.addFilters(DruidAbstractDataSource.java:1232) ~[druid-1.0.25.jar:1.0.25]
	at com.alibaba.druid.pool.DruidAbstractDataSource.setFilters(DruidAbstractDataSource.java:1221) ~[druid-1.0.25.jar:1.0.25]
	at com.hebta.vinci.opstat.persistence.DruidDBConfig.dataSource(DruidDBConfig.java:94) ~[classes/:?]
	at com.hebta.vinci.opstat.persistence.DruidDBConfig$$EnhancerBySpringCGLIB$$e6af5e40.CGLIB$dataSource$0(<generated>) ~[classes/:?]
	at com.hebta.vinci.opstat.persistence.DruidDBConfig$$EnhancerBySpringCGLIB$$e6af5e40$$FastClassBySpringCGLIB$$d9e7878b.invoke(<generated>) ~[classes/:?]
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at com.hebta.vinci.opstat.persistence.DruidDBConfig$$EnhancerBySpringCGLIB$$e6af5e40.dataSource(<generated>) ~[classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0-internal]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95) ~[?:1.8.0-internal]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55) ~[?:1.8.0-internal]
	at java.lang.reflect.Method.invoke(Method.java:507) ~[?:2.6 (06-30-2015)]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:467) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1342) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1249) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	... 24 more
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Priority
	at java.net.URLClassLoader.findClass(URLClassLoader.java:607) ~[?:1.8.0-internal]
	at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:797) ~[?:1.8.0-internal]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:771) ~[?:1.8.0-internal]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:325) ~[?:1.8.0-internal]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:752) ~[?:1.8.0-internal]
	at java.lang.Class.forNameImpl(Native Method) ~[?:1.8.0-internal]
	at java.lang.Class.forName(Class.java:273) ~[?:1.8.0-internal]
	at com.alibaba.druid.util.Utils.loadClass(Utils.java:222) ~[druid-1.0.25.jar:1.0.25]
	at com.alibaba.druid.filter.FilterManager.loadFilter(FilterManager.java:104) ~[druid-1.0.25.jar:1.0.25]
	at com.alibaba.druid.pool.DruidAbstractDataSource.addFilters(DruidAbstractDataSource.java:1232) ~[druid-1.0.25.jar:1.0.25]
	at com.alibaba.druid.pool.DruidAbstractDataSource.setFilters(DruidAbstractDataSource.java:1221) ~[druid-1.0.25.jar:1.0.25]
	at com.hebta.vinci.opstat.persistence.DruidDBConfig.dataSource(DruidDBConfig.java:94) ~[classes/:?]
	at com.hebta.vinci.opstat.persistence.DruidDBConfig$$EnhancerBySpringCGLIB$$e6af5e40.CGLIB$dataSource$0(<generated>) ~[classes/:?]
	at com.hebta.vinci.opstat.persistence.DruidDBConfig$$EnhancerBySpringCGLIB$$e6af5e40$$FastClassBySpringCGLIB$$d9e7878b.invoke(<generated>) ~[classes/:?]
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
	at com.hebta.vinci.opstat.persistence.DruidDBConfig$$EnhancerBySpringCGLIB$$e6af5e40.dataSource(<generated>) ~[classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0-internal]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95) ~[?:1.8.0-internal]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55) ~[?:1.8.0-internal]
	at java.lang.reflect.Method.invoke(Method.java:507) ~[?:2.6 (06-30-2015)]

我的依賴樹顯示了 log4j 的 jar 包是有的：

[INFO] +- org.springframework.boot:spring-boot-starter-aop:jar:1.5.4.RELEASE:compile
[INFO] |  +- org.springframework:spring-aop:jar:4.3.9.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-beans:jar:4.3.9.RELEASE:compile
[INFO] |  \- org.aspectj:aspectjweaver:jar:1.8.10:compile
[INFO] +- org.mybatis.spring.boot:mybatis-spring-boot-starter:jar:1.3.0:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-jdbc:jar:1.5.4.RELEASE:compile
[INFO] |  |  +- org.apache.tomcat:tomcat-jdbc:jar:8.5.15:compile
[INFO] |  |  |  \- org.apache.tomcat:tomcat-juli:jar:8.5.15:compile
[INFO] |  |  \- org.springframework:spring-jdbc:jar:4.3.9.RELEASE:compile
[INFO] |  |     \- org.springframework:spring-tx:jar:4.3.9.RELEASE:compile
[INFO] |  +- org.mybatis.spring.boot:mybatis-spring-boot-autoconfigure:jar:1.3.0:compile
[INFO] |  +- org.mybatis:mybatis:jar:3.4.4:compile
[INFO] |  \- org.mybatis:mybatis-spring:jar:1.3.1:compile
[INFO] +- org.springframework.session:spring-session:jar:1.3.1.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:1.5.4.RELEASE:compile
[INFO] |  +- org.hibernate:hibernate-validator:jar:5.3.5.Final:compile
[INFO] |  |  +- javax.validation:validation-api:jar:1.1.0.Final:compile
[INFO] |  |  +- org.jboss.logging:jboss-logging:jar:3.3.1.Final:compile
[INFO] |  |  \- com.fasterxml:classmate:jar:1.3.3:compile
[INFO] |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.8.8:compile
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile
[INFO] |  |  \- com.fasterxml.jackson.core:jackson-core:jar:2.8.8:compile
[INFO] |  +- org.springframework:spring-web:jar:4.3.9.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-context:jar:4.3.9.RELEASE:compile
[INFO] |  \- org.springframework:spring-webmvc:jar:4.3.9.RELEASE:compile
[INFO] |     \- org.springframework:spring-expression:jar:4.3.9.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter:jar:1.5.4.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot:jar:1.5.4.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.4.RELEASE:compile
[INFO] |  +- org.springframework:spring-core:jar:4.3.9.RELEASE:compile
[INFO] |  \- org.yaml:snakeyaml:jar:1.17:runtime
[INFO] +- org.springframework.boot:spring-boot-starter-log4j2:jar:1.5.4.RELEASE:compile
[INFO] |  +- org.apache.logging.log4j:log4j-slf4j-impl:jar:2.7:compile
[INFO] |  |  \- org.slf4j:slf4j-api:jar:1.7.25:compile
[INFO] |  +- org.apache.logging.log4j:log4j-api:jar:2.7:compile
[INFO] |  +- org.apache.logging.log4j:log4j-core:jar:2.7:compile
[INFO] |  +- org.slf4j:jcl-over-slf4j:jar:1.7.25:compile
[INFO] |  \- org.slf4j:jul-to-slf4j:jar:1.7.25:compile
[INFO] +- org.springframework.boot:spring-boot-starter-tomcat:jar:1.5.4.RELEASE:provided
[INFO] |  +- org.apache.tomcat.embed:tomcat-embed-core:jar:8.5.15:provided
[INFO] |  +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.5.15:provided
[INFO] |  \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.5.15:provided
[INFO] +- org.springframework.boot:spring-boot-starter-test:jar:1.5.4.RELEASE:test
[INFO] |  +- org.springframework.boot:spring-boot-test:jar:1.5.4.RELEASE:test
[INFO] |  +- org.springframework.boot:spring-boot-test-autoconfigure:jar:1.5.4.RELEASE:test
[INFO] |  +- com.jayway.jsonpath:json-path:jar:2.2.0:test
[INFO] |  |  \- net.minidev:json-smart:jar:2.2.1:test
[INFO] |  |     \- net.minidev:accessors-smart:jar:1.1:test
[INFO] |  |        \- org.ow2.asm:asm:jar:5.0.3:test
[INFO] |  +- junit:junit:jar:4.12:test
[INFO] |  +- org.assertj:assertj-core:jar:2.6.0:test
[INFO] |  +- org.mockito:mockito-core:jar:1.10.19:test
[INFO] |  |  \- org.objenesis:objenesis:jar:2.1:test
[INFO] |  +- org.hamcrest:hamcrest-core:jar:1.3:test
[INFO] |  +- org.hamcrest:hamcrest-library:jar:1.3:test
[INFO] |  +- org.skyscreamer:jsonassert:jar:1.4.0:test
[INFO] |  |  \- com.vaadin.external.google:android-json:jar:0.0.20131108.vaadin1:test
[INFO] |  \- org.springframework:spring-test:jar:4.3.9.RELEASE:test
[INFO] +- org.springframework.boot:spring-boot-devtools:jar:1.5.4.RELEASE:compile
[INFO] +- com.alibaba:druid:jar:1.0.25:compile
[INFO] |  +- com.alibaba:jconsole:jar:1.8.0:system
[INFO] |  \- com.alibaba:tools:jar:1.8.0:system
[INFO] \- com.oracle:ojdbc6:jar:11.2.0.3:compile
再就看了下以前工程使用的 log4j 的 jar 包引入，就把下面這段拷貝到 Spring Boot 工程裡，居然可以工作了： 
		<!-- if no this dependency, then error comes: ClassNotFoundException:org.apache.log4j.Priority! -->
	    <dependency>
	      <groupId>log4j</groupId>
	      <artifactId>log4j</artifactId>
	      <version>1.2.12</version>
	    </dependency>

從 MvnRepository 上看到這個 log4j 的 jar 包已經進化到 log4j-core 上，而這個包其實已經被 log4j2 starter 依賴了，之所以這樣，從上面的錯誤日誌看，應該是 Druid 使用了這個舊的版本，所以要加進來，之所以沒有衝突是因為裡面的 package 路徑不一樣。


後來又網上找了下，希望能使用 log4j2.properties 的方式定義日誌，LOG4J 2 CONFIGURATION: USING PROPERTIES FILE 比較好，寫的很詳細， 特別提到了從 log4j2  版本 2.4 才開始支援 properties 的方式，而我使用的 spring boot 版本較高，所以 log4j2 的版本已經是 2.7 了。

所以我的 application.properties 檔案是這樣註冊 log4j2 的：

# 使用 log4j 作為日誌輸出
logging.config=classpath:log4j2.properties
整個 pom.xml ： 
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.hebta.vinci</groupId>
	<artifactId>opstat</artifactId>
	<version>1.0</version>
	<packaging>war</packaging>

	<name>opstat</name>
	<description>Demo project for Spring Boot</description>

	<repositories>
		<repository>
			<id>nexus</id>
			<name>maven-central</name>
			<url>http://192.168.1.220:8081/repository/maven-public/</url>
		</repository>
		<repository>
			<id>springsource.releases</id>
			<name>SpringSource GA Repository</name>
			<url>http://repo.springsource.org/release</url>
			<releases>
				<enabled>true</enabled>
			</releases>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.4.RELEASE</version>
		<relativePath />
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-aop</artifactId>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.0</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.session</groupId>
			<artifactId>spring-session</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</artifactId>
			<exclusions>
				<exclusion>
					<groupId>org.springframework.boot</groupId>
					<artifactId>spring-boot-starter-logging</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-log4j2</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<!-- below is added by developer -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.25</version>
		</dependency>
		<dependency>
			<groupId>com.oracle</groupId>
			<artifactId>ojdbc6</artifactId>
			<version>11.2.0.3</version>
			<scope>compile</scope>
		</dependency>
		<!-- if no this dependency, then error comes: ClassNotFoundException:org.apache.log4j.Priority! -->
	    <dependency>
	      <groupId>log4j</groupId>
	      <artifactId>log4j</artifactId>
	      <version>1.2.12</version>
	    </dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

整個 log4j2.properties 檔案如下： 

name=PropertiesConfig
property.filename = logs
appenders = console, file

appender.console.type = Console
appender.console.name = STDOUT
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} %c{1} - %msg%n

appender.file.type = File
appender.file.name = LOGFILE
appender.file.fileName= D:/mylog/springboot/logError.log
appender.file.layout.type=PatternLayout
appender.file.layout.pattern=[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} %c{1} - %msg%n

rootLogger.level = debug
rootLogger.appenderRef.stdout.ref = STDOUT
rootLogger.appenderRef.file.ref = LOGFILE





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