错误解决方法：log4j:WARN No appenders could be found for logger (com.mchange.v2.log.MLog). log4j:WARN Plea

最新推荐文章于 2021-12-21 16:36:08 发布

原创最新推荐文章于 2021-12-21 16:36:08 发布 · 5.8k 阅读

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本文介绍了一种常见的Log4j警告问题，即在Spring配置前未正确初始化Log4j系统导致的日志记录器未找到。文章提供了具体的XML配置示例，展示了如何调整Web应用程序部署描述符中的配置顺序来解决问题。

log4j:WARN No appenders could be found for logger (com.mchange.v2.log.MLog).
log4j:WARN Please initialize the log4j system properly.
Spring配置监听器先于Log4j配置监听器执行了，解决很简单，把Log4j配置放在Spring配置前就ok了。
解决方法：
修改xml文件

<?xml version="1.0" encoding="UTF-8"?>  
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
    id="WebApp_ID" version="2.5">  
    <display-name>SSHDemo</display-name>  
    <welcome-file-list>  
        <welcome-file>index.html</welcome-file>  
        <welcome-file>index.htm</welcome-file>  
        <welcome-file>index.jsp</welcome-file>  
        <welcome-file>default.html</welcome-file>  
        <welcome-file>default.htm</welcome-file>  
        <welcome-file>default.jsp</welcome-file>  
    </welcome-file-list>  
    <!-- Struts2 configuration -->  
    <filter>  
        <filter-name>struts2</filter-name>  
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>  
    </filter>  
    <filter-mapping>  
        <filter-name>struts2</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  

    <!-- Log4j configuration -->  
    <context-param>  
        <param-name>webAppRootKey</param-name>  
        <param-value>sshdemo.root</param-value>  
    </context-param>  
    <context-param>  
        <param-name>log4jConfigLocation</param-name>  
        <param-value>/WEB-INF/log4j.properties</param-value>  
    </context-param>  
    <listener>  
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>  
    </listener>  

    <context-param>  
        <param-name>contextConfigLocation</param-name>  
        <param-value>/WEB-INF/applicationContext.xml</param-value>  
    </context-param>  
    <listener>  
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
    </listener>  
    <listener>  
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>  
    </listener>  
</web-app>