两个log4j导致的错误现象

1. 出错提示

 

log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
log4j:ERROR [org.apache.catalina.loader.StandardClassLoader@15a3d6b] whereas object of type
log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by [WebappClassLoader
  delegate: false
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@f9c40
].
log4j:ERROR Could not instantiate appender named "S".
Loading jar:file:/scionDevTool/tomcat/mes-portal-server-0.3.4/liferay-portal-5.2.3/tomcat-5.5.27/webapps/ROOT/WEB-INF/lib/portal-impl.jar!/system.properties

 

2.原因是 liferay/common/lib/log4j-1.2.9.jar

另外在应用程序有(pom.xml)

 

      <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.4.2</version>
        </dependency>

 

依赖log4j

 

3.解决方法

 

 

<dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.4.2</version>
    
            <exclusions>
                <exclusion>
                    <artifactId>log4j</artifactId>
                    <groupId>log4j</groupId>
                </exclusion>
            </exclusions>
  
        </dependency>