湖南网站建设磐石网络,wordpress 手机端模板下载,外链怎么打开,wordpress写表格1 logback概述
SLF4J与其它日志组件调用关系图如下所示。 SLF4J#xff0c;即Java中的简单日志门面#xff08;Simple Logging Facade for Java#xff09;#xff0c;不是具体的日志解决方案#xff0c;它只服务于各种各样的日志系统。
SLF4J最常用的日志实现框架是即Java中的简单日志门面Simple Logging Facade for Java不是具体的日志解决方案它只服务于各种各样的日志系统。
SLF4J最常用的日志实现框架是log4j、logback。一般有slf4jlog4j、slf4jlog4j2、slf4jlogback三种日志组合。下面将介绍logback的简单使用和使用中遇到的常用问题的排查。 2 引入依赖 !--logback--dependencygroupIdch.qos.logback/groupIdartifactIdlogback-classic/artifactIdversion1.2.3/version/dependency 3 新增配置
在resources文件夹下面创建logback.xml配置文件。举例如下。
?xml version1.0 encodingUTF-8?
configurationappender namestdout classch.qos.logback.core.ConsoleAppenderencoder classch.qos.logback.core.encoder.LayoutWrappingEncoderlayout classch.qos.logback.classic.PatternLayoutPattern%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{1000}-%M:%L - %msg%n/Pattern/layout/encoder/appenderappender namelogstash classch.qos.logback.core.rolling.RollingFileAppenderfile/app/logs/demoForStudy/logstash.log/filerollingPolicy classch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy!-- rollover daily --FileNamePattern/app/logs/demoForStudy/logstash.%d{yyyy-MM-dd}-%i.log/FileNamePattern!-- each file should be at most 10MB, keep 2 days worth of history, but at most 100MB --maxFileSize10MB/maxFileSizemaxHistory2/maxHistorytotalSizeCap100MB/totalSizeCap!-- archive removal will be executed on appender start up --cleanHistoryOnStarttrue/cleanHistoryOnStart/rollingPolicylayout classch.qos.logback.classic.PatternLayoutpattern%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{1000}-%M:%L - %msg%n/pattern/layout/appenderroot levelINFOappender-ref refstdout / !-- 输出到控制台 --appender-ref reflogstash / !-- 输出到logstash --/root/configuration 4 问题排查
可能出现的问题如下。
4.1 LoggerFactory is not a Logback LoggerContext but Logback is on the classpath
4.1.1 报错
启动报错如下
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/softwareInstall/maven/repository/org/slf4j/slf4j-log4j12/1.7.30/slf4j-log4j12-1.7.30.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/softwareInstall/maven/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
Exception in thread main java.lang.IllegalArgumentException: LoggerFactory is not a Logback LoggerContext but Logback is on the classpath. Either remove Logback or the competing implementation (class org.slf4j.impl.Log4jLoggerFactory loaded from file:/softwareInstall/maven/repository/org/slf4j/slf4j-log4j12/1.7.30/slf4j-log4j12-1.7.30.jar). If you are using WebLogic you will need to add org.slf4j to prefer-application-packages in WEB-INF/weblogic.xml: org.slf4j.impl.Log4jLoggerFactoryat org.springframework.util.Assert.instanceCheckFailed(Assert.java:702)at org.springframework.util.Assert.isInstanceOf(Assert.java:621)at org.springframework.boot.logging.logback.LogbackLoggingSystem.getLoggerContext(LogbackLoggingSystem.java:290)at org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:117)at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:232)at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:213)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.starting(EventPublishingRunListener.java:76)at org.springframework.boot.SpringApplicationRunListeners.lambda$starting$0(SpringApplicationRunListeners.java:53)at java.util.ArrayList.forEach(ArrayList.java:1257)at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:117)at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:53)at org.springframework.boot.SpringApplication.run(SpringApplication.java:317)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298)at com.hn.liao.study.DemoForStudyApplication.main(DemoForStudyApplication.java:37)
4.1.2 问题原因
从报错可知因为在项目中存在SLF4J的两种日志桥接绑定或日志实现组件slf4j-log4j12和logback-classic即日志实现组件的包冲突导致项目启动报错。
4.1.3 排除slf4j-log4j12依赖
首先右键pom.xml文件通过选项“Maven-show Depedencies”显示项目中包的依赖关系然后在依赖关系文件中直接搜索“slf4j-log4j12”找到该包。最后选中该包右键通过选项“Exclude”直接排除此依赖。
操作截图如下所示。 5 参考文献
1Chapter 4: Appenders
2logback详解
3IDEA 报错 LoggerFactory is not a Logback LoggerContext but Logback is on the classpath
