修改了java代码，在eclipse里启动的tomcat自动reload，但是报异常了？什么原因？
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三月 20, 2014 11:11:48 下午 org.apache.catalina.loader.WebappClassLoader loadClass
信息: Illegal access: this web application instance has been stopped already. Could not load org.apache.commons.logging.impl.LogFactoryImpl. 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:1597)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
at org.apache.commons.logging.LogFactory.createFactory(LogFactory.java:1131)
at org.apache.commons.logging.LogFactory$2.run(LogFactory.java:1065)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.commons.logging.LogFactory.newFactory(LogFactory.java:1062)
at org.apache.commons.logging.LogFactory.getFactory(LogFactory.java:650)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:704)
at com.qfmis.library.log.StdOutErrLog$StdOutErrPrintStream.getLogger(StdOutErrLog.java:148)
at com.qfmis.library.log.StdOutErrLog$StdOutErrPrintStream.log(StdOutErrLog.java:125)
at com.qfmis.library.log.StdOutErrLog$StdOutErrPrintStream.println(StdOutErrLog.java:120)
at org.apache.log4j.helpers.LogLog.error(LogLog.java:129)
at org.apache.log4j.helpers.PatternParser.finalizeConverter(PatternParser.java:359)
at org.apache.log4j.helpers.PatternParser.parse(PatternParser.java:187)
at org.apache.log4j.PatternLayout.setConversionPattern(PatternLayout.java:446)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.log4j.config.PropertySetter.setProperty(PropertySetter.java:206)
at org.apache.log4j.config.PropertySetter.setProperty(PropertySetter.java:165)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:130)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:97)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:684)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:647)
at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:544)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:440)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:334)
at org.apache.log4j.PropertyWatchdog.doOnChange(PropertyConfigurator.java:717)
at org.apache.log4j.helpers.FileWatchdog.checkAndConfigure(FileWatchdog.java:89)
at org.apache.log4j.helpers.FileWatchdog.<init>(FileWatchdog.java:58)
at org.apache.log4j.PropertyWatchdog.<init>(PropertyConfigurator.java:709)
at org.apache.log4j.PropertyConfigurator.configureAndWatch(PropertyConfigurator.java:400)
at org.springframework.util.Log4jConfigurer.initLogging(Log4jConfigurer.java:106)
at org.springframework.web.util.Log4jWebConfigurer.initLogging(Log4jWebConfigurer.java:144)
at org.springframework.web.util.Log4jConfigListener.contextInitialized(Log4jConfigListener.java:47)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3920)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1345)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1519)
at java.lang.Thread.run(Thread.java:722)
三月 20, 2014 11:11:48 下午 org.apache.catalina.loader.WebappClassLoader loadClass
信息: Illegal access: this web application instance has been stopped already. Could not load org.apache.commons.logging.impl.LogFactoryImpl$3. 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:1597)