Tomcat Log log4j,slf4j,logback conflict

Problem Description:

Start Tomcat and discover that Tomcat cannot start, Catalina.out has the following error log:

INFO [Localhost-startstop-1]org.apache.catalina.core.applicationcontext.log Closing Spring Rootwebapplicationcontext

SEVERE [Localhost-startstop-1]org.apache.catalina.core.standardcontext.listenerstop Exception sending Contextdestroyed event to listener instance of Classorg.springframework.web.context.ContextLoaderListener

Java.lang.NoClassDefFoundError:Could Notinitialize class Org.apache.log4j.Log4jLoggerFactory

Atorg.apache.log4j.LogManager.getLogger (logmanager.java:44)

Atorg.slf4j.impl.Log4jLoggerFactory.getLogger (log4jloggerfactory.java:73)

Atorg.slf4j.LoggerFactory.getLogger (loggerfactory.java:270)

Atorg.apache.commons.logging.impl.SLF4JLogFactory.getInstance (slf4jlogfactory.java:156)

Atorg.apache.commons.logging.impl.SLF4JLogFactory.getInstance (slf4jlogfactory.java:132)

Atorg.apache.commons.logging.LogFactory.getLog (logfactory.java:274)

Atorg.springframework.web.context.contextcleanuplistener.<clinit> (contextcleanuplistener.java:43)

Atorg.springframework.web.context.ContextLoaderListener.contextDestroyed (contextloaderlistener.java:145)

Atorg.apache.catalina.core.StandardContext.listenerStop (standardcontext.java:4860)

Atorg.apache.catalina.core.StandardContext.stopInternal (standardcontext.java:5495)

Atorg.apache.catalina.util.LifecycleBase.stop (lifecyclebase.java:224)

Atorg.apache.catalina.util.LifecycleBase.start (lifecyclebase.java:159)

Atorg.apache.catalina.core.containerbase$startchild.call (containerbase.java:1407)

Atorg.apache.catalina.core.containerbase$startchild.call (containerbase.java:1397)

Atjava.util.concurrent.FutureTask.run (futuretask.java:266)

Atjava.util.concurrent.ThreadPoolExecutor.runWorker (threadpoolexecutor.java:1142)

Atjava.util.concurrent.threadpoolexecutor$worker.run (threadpoolexecutor.java:617)

Atjava.lang.Thread.run (thread.java:745)

Problem Analysis:

Check the Lib library below and discover that the log4j and logback combinations have been updated today, with the following packages in total:

Slf4j-api-1.7.5.jar

Slf4j-log4j12-1.6.1.jar

Log4j-1.2.16.jar

Log4j-over-slf4j-1.7.5.jar

Logback-core-1.1.2.jar

Logback-classic-1.1.2.jar

By querying the data found that the package Slf4j-log4j12-1.6.1.jar and log4j conflict.

Workaround:

normal after deletion, Delete this: Slf4j-log4j12-1.6.1.jar

Common combinations of attachments:

Log4j+slf4j

Slf4j-api-1.7.5.jar

Slf4j-log4j12-1.6.1.jar

Log4j-1.2.16.jar

Slf4j+logback

Logback-core-1.1.2.jar

Logback-classic-1.1.2.jar

Slf4j-api-1.7.5.jar

Resources:

Http://logback.qos.ch/documentation.html

Http://logging.apache.org/log4j/1.2/

http://www.slf4j.org/

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Tomcat Log Log4j,slf4j,logback conflicts