22 . 11 . 2006   12 : 08 : 39  org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context []
 22 . 11 . 2006   12 : 08 : 41  org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access:  this  web application instance has been stopped already.  Could not load com.mysql.jdbc.Messages.  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: 1238 )
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java: 1198 )
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java: 319 )
	at com.mysql.jdbc.CommunicationsException.<init>(CommunicationsException.java: 174 )
	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java: 2710 )
	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java: 2621 )
	at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java: 1338 )
	at com.mysql.jdbc.Connection.realClose(Connection.java: 4429 )
	at com.mysql.jdbc.Connection.cleanup(Connection.java: 1973 )
	at com.mysql.jdbc.Connection.finalize(Connection.java: 3114 )
	at java.lang.ref.Finalizer.invokeFinalizeMethod( Native  Method)
	at java.lang.ref.Finalizer.runFinalizer(Finalizer.java: 83 )
	at java.lang.ref.Finalizer.access$ 100 (Finalizer.java: 14 )
	at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java: 160 )
log4j:WARN No appenders could be found  for  logger (org.apache.commons.digester.Digester.sax).
log4j:WARN Please initialize the log4j system properly.

 public   class  CategoryManager {

     private   static   final  CategoryManager CATEGORY_MANAGER =  new  CategoryManager();

     public   static  CategoryManager getInstance() {
         return  CATEGORY_MANAGER;
    }

     private  CategoryManager() {
    }

     public   void  addCategory(Category category)  throws  DbException {
         try  {
            Session session = HibernateUtil.currentSession();
            Transaction tx = session.beginTransaction();
            session.save(category);
            tx.commit();
            HibernateUtil.closeSession();
        }  catch  (HibernateException e) {
             throw   new  DbException("Error during category adding", e);
        }
    }
.........

 public   class  HibernateUtil {

     private   static   final  SessionFactory sessionFactory;

     static  {
         try  {
            // Create the SessionFactory
            sessionFactory =  new  Configuration().configure().buildSessionFactory();
        }  catch  (HibernateException ex) {
             throw   new  RuntimeException("Configuration problem: " + ex.getMessage(), ex);
        }
    }

     public   static   final  ThreadLocal session =  new  ThreadLocal();

     public   static  Session currentSession()  throws  HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this Thread has none yet
         if  (s ==  null ) {
            s = sessionFactory.openSession();
            session.set(s);
        }
         return  s;
    }

     public   static   void  closeSession()  throws  HibernateException {
        Session s = (Session) session.get();
        session.set( null );
         if  (s !=  null )
            s.close();
    }
}