A little error in J2EETutorial

"Serverlet Life Circule", file:///C:/j2eetutorial14/doc/Servlets4.html#wp73579
There is an error in this section:
public void contextDestroyed(ServletContextEvent event) {
context = event.getServletContext();
BookDBAO bookDB = context.getAttribute("bookDB"); //error! shoud be:
//BookDBAO bookDB = (BookDBAO) context.getAttribute("bookDB");
bookDB.remove();
context.removeAttribute("bookDB");
context.removeAttribute("hitCounter");
context.removeAttribute("orderCounter");
}

Thanks. I'll forward it to the appropriate party.

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