当我启动Tomcat时，在catalina.out中出现此错误6.有什么想法吗？
Jul 01, 2014 4:42:34 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory AAA0628
Jul 01, 2014 4:42:34 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory AAA0701
Jul 01, 2014 4:42:35 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory AAA0627
Jul 01, 2014 4:42:35 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory AAA0606
Jul 01, 2014 4:42:35 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory AAA0629
Jul 01, 2014 4:42:35 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory AAA0616
Jul 01, 2014 4:42:35 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory ROOT
Jul 01, 2014 4:42:35 PM org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already. Could not load org.apache.log4j.spi.NOPLoggerRepository. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1566)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.log4j.LogManager.getLoggerRepository(LogManager.java:197)
at org.apache.log4j.LogManager.getLogger(LogManager.java:228)
at org.apache.log4j.Logger.getLogger(Logger.java:104)
at org.apache.commons.logging.impl.Log4JLogger.getLogger(Log4JLogger.java:289)
at org.apache.commons.logging.impl.Log4JLogger.isDebugEnabled(Log4JLogger.java:299)