log4j与tomcat9热部署的冲突问题

Question

在tomcat9中 server.xml 文件配置 reloadable="true"

在更改java代码之后 会导致log异常：

四月 26, 2017 10:04:22 上午 org.apache.catalina.loader.WebappClassLoaderBase checkStateForResourceLoading
信息: Illegal access: this web application instance has been stopped already. Could not load [org.apache.log4j.PatternLayout]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [org.apache.log4j.PatternLayout]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1295)
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1283)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1148)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1109)
    at org.apache.log4j.helpers.Loader.loadClass(Loader.java:185)
    at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:327)
    at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:124)
    at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:797)
    at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
    at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:395)
at org.apache.log4j.PropertyWatchdog.doOnChange(PropertyConfigurator.java:955)
at org.apache.log4j.helpers.FileWatchdog.checkAndConfigure(FileWatchdog.java:89)
at org.apache.log4j.helpers.FileWatchdog.run(FileWatchdog.java:108)

Answer 1

遇到类似的问题，请问楼主如何解决这个问题的？