INFO: Illegal access: this web application instance has been stopped already. Could not load java.net.InetAddress

I'm experiencing this kind of exception, can someone help me about this problem?

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.quartz.utils.UpdateChecker.getClientId(UpdateChecker.java:149)
at org.quartz.utils.UpdateChecker.buildParamsString(UpdateChecker.java:120)
at org.quartz.utils.UpdateChecker.buildUpdateCheckUrl(UpdateChecker.java:114)
at org.quartz.utils.UpdateChecker.doCheck(UpdateChecker.java:55)
at org.quartz.utils.UpdateChecker.checkForUpdate(UpdateChecker.java:47)
at org.quartz.utils.UpdateChecker.run(UpdateChecker.java:39)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)

I'm also getting the same exception with Could not load java.net.URLEncoder and Could not load java.net.URLConnection. I'm using Eclipse Indigo SR1 and Tomcat V6.0

You can solve this problem after restarting the server, the server iscaching older version of the app.

see here

You cannot resolve this problem by "restarting the server".

The problem is that when you update your app by uploading a new version to Tomcat, some resource is not cleaned up properly. Could be anything from a runaway thread, to some kind of scheduled service, to a listener. When that process tries to load a class, Tomcat will detect and prevent it.

The solution to the problem is to properly keep track of, and on shutdown close, those threads.

I have also experienced this problem recently. In my case the problem was generated by an unhandled exception in javax.servlet.ServletContextListener which was logged in one localhost-date.log. Because of that exception the webapp was not deployed, but an already started java.util.concurrent.Executors was still running which caused another chain of exceptions in catalina-date.log:
java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load WhatEver.class.

The solution for my case:

• check all the Tomcat logs
• fix exceptions in javax.servlet.ServletContextListener