Struts2之log信息不出的问题

刚开始学习Struts2的时候，用的是maven方式，但是却不如官方文中所指的出log信息

 

http://struts.apache.org/2.2.1/docs/create-struts-2-web-application-using-maven-to-manage-artifacts-and-to-build-the-application.html

 

就是文末提到的：

Struts 2 Log Messages

com.opensymphony.xwork2.DefaultActionProxy.debug:57 - Creating an DefaultActionProxy for

 namespace / and action name index
...
org.apache.struts2.dispatcher.ServletDispatcherResult.debug:57 - Forwarding to location /index.jsp

 

 

很是疑惑，按理配置啥的官方都是全部提供的，配置位置也不可能搞错，因为如果删除了log4j.xml，启动tomcat后会有提示缺少log4j配置文件，那到底是哪里出了问题呢？

 

后来发现是少了commons-logging-1.0.4.jar，为什么maven自动编译会漏了这个jar包呢？pom.xml如下：

 

<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>manning</groupId>
	<artifactId>Basic_Struts2_Mvn</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>Basic Struts 2</name>
	<build>
		<finalName>Basic_Struts2_Mvn</finalName>
	</build>
	<dependencies>

		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>2.2.1</version>
		</dependency>

		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.14</version>
		</dependency>
		<dependency>
			<groupId>javassist</groupId>
			<artifactId>javassist</artifactId>
			<version>3.8.0.GA</version>
		</dependency>

	</dependencies>

</project>

 貌似是没提到commons-logging系列，还有一个问题log4j的输出怎么会需要common-logging呢，莫非这输出不如官方所说不是log4j的？

 

2010-12-30 11:00:02,700 DEBUG com.opensymphony.xwork2.config.ConfigurationManager.debug:68 - Checking ConfigurationProviders for reload.
2010-12-30 11:00:02,805 DEBUG com.opensymphony.xwork2.conversion.impl.InstantiatingNullHandler.debug:68 - Entering nullPropertyValue [target=[com.opensymphony.xwork2.DefaultTextProvider@3278f], property=struts]
2010-12-30 11:00:02,822 DEBUG com.opensymphony.xwork2.config.ConfigurationManager.debug:68 - Checking ConfigurationProviders for reload.
2010-12-30 11:00:02,879 DEBUG com.opensymphony.xwork2.conversion.impl.InstantiatingNullHandler.debug:68 - Entering nullPropertyValue [target=[com.opensymphony.xwork2.DefaultTextProvider@3278f], property=struts]
2010-12-30 11:00:02,889 DEBUG com.opensymphony.xwork2.config.ConfigurationManager.debug:68 - Checking ConfigurationProviders for reload.
2010-12-30 11:00:02,928 DEBUG com.opensymphony.xwork2.DefaultActionProxy.debug:68 - Creating an DefaultActionProxy for namespace / and action name index
2010-12-30 11:00:03,012 DEBUG com.opensymphony.xwork2.interceptor.I18nInterceptor.debug:68 - intercept '//index' {
2010-12-30 11:00:03,012 DEBUG com.opensymphony.xwork2.interceptor.I18nInterceptor.debug:68 - applied invocation context locale=zh_CN
2010-12-30 11:00:03,013 DEBUG com.opensymphony.xwork2.interceptor.I18nInterceptor.debug:68 - before Locale=zh_CN
2010-12-30 11:00:03,211 DEBUG com.opensymphony.xwork2.conversion.impl.InstantiatingNullHandler.debug:68 - Entering nullPropertyValue [target=[com.opensymphony.xwork2.ActionSupport@15aef45, com.opensymphony.xwork2.DefaultTextProvider@3278f], property=struts]
2010-12-30 11:00:03,268 DEBUG org.apache.struts2.interceptor.FileUploadInterceptor.debug:68 - Bypassing //index
2010-12-30 11:00:03,269 DEBUG com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.debug:68 - Setting static parameters {}
2010-12-30 11:00:03,283 DEBUG com.opensymphony.xwork2.interceptor.ParametersInterceptor.debug:68 - Setting params NONE
2010-12-30 11:00:03,284 DEBUG com.opensymphony.xwork2.interceptor.ParametersInterceptor.debug:68 - Setting params
2010-12-30 11:00:03,314 DEBUG org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.debug:68 - Validating //index with method execute.
2010-12-30 11:00:03,527 DEBUG com.opensymphony.xwork2.validator.ValidationInterceptor.debug:68 - Invoking validate() on action com.opensymphony.xwork2.ActionSupport@15aef45
2010-12-30 11:00:03,536 DEBUG com.opensymphony.xwork2.interceptor.PrefixMethodInvocationUtil.debug:68 - cannot find method [validateExecute] in action [com.opensymphony.xwork2.ActionSupport@15aef45]
2010-12-30 11:00:03,537 DEBUG com.opensymphony.xwork2.interceptor.PrefixMethodInvocationUtil.debug:68 - cannot find method [validateDoExecute] in action [com.opensymphony.xwork2.ActionSupport@15aef45]
2010-12-30 11:00:03,538 DEBUG com.opensymphony.xwork2.DefaultActionInvocation.debug:68 - Executing action method = null
2010-12-30 11:00:03,547 DEBUG org.apache.struts2.dispatcher.ServletDispatcherResult.debug:68 - Forwarding to location /index.jsp
2010-12-30 11:00:03,574 DEBUG com.opensymphony.xwork2.conversion.impl.InstantiatingNullHandler.debug:68 - Entering nullPropertyValue [target=[com.opensymphony.xwork2.ActionSupport@15aef45, com.opensymphony.xwork2.DefaultTextProvider@3278f], property=struts]
2010-12-30 11:00:03,595 DEBUG com.opensymphony.xwork2.conversion.impl.InstantiatingNullHandler.debug:68 - Entering nullPropertyValue [target=[com.opensymphony.xwork2.ActionSupport@15aef45, com.opensymphony.xwork2.DefaultTextProvider@3278f], property=org]
2010-12-30 11:00:03,799 DEBUG com.opensymphony.xwork2.interceptor.I18nInterceptor.debug:68 - after Locale=zh_CN
2010-12-30 11:00:03,799 DEBUG com.opensymphony.xwork2.interceptor.I18nInterceptor.debug:68 - intercept }

 

如上控制台日志信息com.opensymphony和org.apache.struts2都是在log4j.xml中配置的：

 

<!-- specify the logging level for loggers from other libraries -->
<logger name="com.opensymphony">
    <level value="DEBUG" />
</logger>

<logger name="org.apache.struts2">
    <level value="DEBUG" />
</logger>

 

可见，日志输出应与log4j是有直接关系的，尝试删除过log4j-1.2.14.jar，会导致日志不出，由此得出结论两个日志关联jar包缺一不可，但两者为什么要必须同时呢？用到了什么呢？