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當我將war文件my-server.war部署到Tomcat7時（使用mvn cargo:deploy或mvn cargo:redeploy），我得到錯誤Error listenerStart和Context [/my-server] startup failed due to previous errors（請參閱下面的日誌片段）。如何在Tomcat7的WAR部署過程中診斷「Error listenerStart」錯誤？
Jul 12, 2013 12:52:41 PM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive /var/lib/tomcat7/webapps/my-server.war
Jul 12, 2013 12:52:42 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
Jul 12, 2013 12:52:42 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/my-server] startup failed due to previous errors
Jul 12, 2013 12:53:13 PM org.apache.catalina.session.ManagerBase processExpires
FINE: Start expire sessions StandardManager at 1373633593504 sessioncount 0
Jul 12, 2013 12:53:13 PM org.apache.catalina.session.ManagerBase processExpires
FINE: End expire sessions StandardManager processingTime 1 expired sessions: 0
Jul 12, 2013 12:53:33 PM org.apache.jasper.compiler.TldLocationsCache tldScanJar
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Jul 12, 2013 12:54:13 PM org.apache.catalina.session.ManagerBase processExpires
FINE: Start expire sessions StandardManager at 1373633653518 sessioncount 0
Jul 12, 2013 12:54:13 PM org.apache.catalina.session.ManagerBase processExpires
FINE: End expire sessions StandardManager processingTime 21 expired sessions: 0
爲了診斷此錯誤，我想配置Tomcat日誌記錄，以便堆棧跟蹤顯示在日誌文件中。
我改變了log4j.properties和logging.properties如下所示，但我仍然看不到堆棧跟蹤。
爲了使兩個錯誤（Error listenerStart和Context [/my-server] startup failed due to previous errors）的詳細信息都存在於日誌文件中，我應該更改哪些日誌記錄配置文件的哪一部分？
log4j.properties：
log4j.rootLogger=debug, R
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=${catalina.home}/logs/tomcat.log
log4j.appender.R.MaxFileSize=10MB
log4j.appender.R.MaxBackupIndex=10
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
log4j.logger.org.apache.catalina=DEBUG, R
log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost]=DEBUG, R
log4j.logger.org.apache.catalina.core=DEBUG, R
log4j.logger.org.apache.catalina.session=DEBUG, R
logging.properties：
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
handlers = 1catalina.org.apache.juli.FileHandler, 2localhost.org.apache.juli.FileHandler, 3manager.org.apache.juli.FileHandler, 4host-manager.org.apache.juli.FileHandler, java.util.logging.ConsoleHandler
.handlers = 1catalina.org.apache.juli.FileHandler, java.util.logging.ConsoleHandler
############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
############################################################
1catalina.org.apache.juli.FileHandler.level = FINE
1catalina.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
1catalina.org.apache.juli.FileHandler.prefix = catalina.
2localhost.org.apache.juli.FileHandler.level = FINE
2localhost.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
2localhost.org.apache.juli.FileHandler.prefix = localhost.
3manager.org.apache.juli.FileHandler.level = FINE
3manager.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
3manager.org.apache.juli.FileHandler.prefix = manager.
4host-manager.org.apache.juli.FileHandler.level = FINE
4host-manager.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
4host-manager.org.apache.juli.FileHandler.prefix = host-manager.
java.util.logging.ConsoleHandler.level = FINE
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
############################################################
# Facility specific properties.
# Provides extra control for each logger.
############################################################
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].level = DEBUG
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].handlers = 2localhost.org.apache.juli.FileHandler
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager].level = DEBUG
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager].handlers = 3manager.org.apache.juli.FileHandler
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager].level = INFO
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager].handlers = 4host-manager.org.apache.juli.FileHandler
# For example, set the org.apache.catalina.util.LifecycleBase logger to log
# each component that extends LifecycleBase changing state:
#org.apache.catalina.util.LifecycleBase.level = FINE
# To see debug messages in TldLocationsCache, uncomment the following line:
#org.apache.jasper.compiler.TldLocationsCache.level = FINE