Illegal access this web application instance has been stopped already

Question

I have a class which has an init-method defined in xml   lt bean id  appStarter  class  com myapp myClass  init-method  init  destroy-method  destroy   gt    myClass   public class myClass       private Thread t       public void init                   t   new Thread                       Override                 public void run                         while  true                          try                               doStuff                                Thread sleep 1000                             catch  Exception e                                e printStackTrace                                                                            t start               public void destroy             t interrupt               When the app starts  these threads run fine  and everything works just fine and after sometime i get the following exception   INFO  Illegal access  this web application instance has been stopped already   Could not load com sun mail imap IMAPStore   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 1273      at org apache catalina loader WebappClassLoader loadClass WebappClassLoader java 1233      at javax mail Session getService Session java 755      at javax mail Session getStore Session java 569      at javax mail Session getStore Session java 531      at javax mail Session getStore Session java 510    in the doStuff method   public void doStuff     Session sessioned   Session getDefaultInstance System getProperties                    null           Store store   sessioned getStore  imap            store connect hostName  userName  password              I don t know why  any ideas

User · Answer

If it s a local development tomcat launched from IDE  then restarting this IDE and rebuild project also helps  Update  You could also try to find if there is any running tomcat process in the background and kill it

User · Answer

In short  this happens likely when you are hot-deploying webapps   For instance  your ide development server hot-deploys a war again  Threads  that have been created previously are still running  But meanwhile their classloader context is invalid and faces the IllegalAccessException   IllegalStateException becouse its orgininating webapp  the former runtime-environment  has been redeployed   So  as states here  a restart does not permanently resolve this issue  Instead  it is better to find implement a managed Thread Pool  s th  like this to handle the termination of threads appropriately  In JavaEE you will use these ManagedThreadExeuctorServices  A similar opinion and reference here   Examples for this are the EvictorThread of Apache Commons Pool  that  cleans  pooled instances according to the pool s configuration  max idle etc

User · Answer

Problem solved after restarting the tomcat and apache  the tomcat was caching older version of the app

User · Answer

Restarting Your Server Can Resolve this problem   I was getting the same error while Using Dynamic Jasper Reporting   When i deploy my Application for first use to Create Reports  the Report creation works fine  But Once I Do Hot Deployment of some code changes To the Server  I was getting This Error

User · Answer

I suspect that this occurs after an attempt to undeploy your app  Do you ever kill off that thread that you ve initialised during the init   process   I would do this in the corresponding destroy   method

[java] Illegal access: this web application instance has been stopped already

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