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I'm facing the following Exception: Mar 26, 2012 1:20:34 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.ThrowableInformation. 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:1562) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521) at org.apache.log4j.spi.LoggingEvent.<init>(LoggingEvent.java:165) at org.apache.log4j.Category.forcedLog(Category.java:391) at org.apache.log4j.Category.error(Category.java:322) at com.abc.supervisionmanager.Monitoring.run(Monitoring.java:205) at java.lang.Thread.run(Thread.java:662) Exception in thread "Thread_Monitoring" java.lang.NoClassDefFoundError: org/apache/log4j/spi/ThrowableInformation at org.apache.log4j.spi.LoggingEvent.<init>(LoggingEvent.java:165) at org.apache.log4j.Category.forcedLog(Category.java:391) at org.apache.log4j.Category.error(Category.java:322) at com.abc.supervisionmanager.Monitoring.run(Monitoring.java:205) at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.ClassNotFoundException: org.apache.log4j.spi.ThrowableInformation at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1676) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521) ... 5 more I googled about this exception and found that most answers points that it is bug in tomcat 5.5 and it will be solved in version 5.5.28. However I'm currently using tomcat 7.11 with log4j-1.2.16.jar I'm still facing the same issue.

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