Call method on undeploy from a Java web-application

Question

I am developing a Java web-application. The application connects to a Lucene index. I create a singleton instance of IndexSearcher. This instance opens some files. When I re

Answer 1

If you implement javax.servlet.ServletContextListener and register that class in web.xml as a <listener>, then then contextDestroyed() method will be called before the context is unloaded.

Answer 2

Implement a ServletContextListener.

@WebListener
public class LuceneConfig implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent event) {
        // Do your job here during webapp startup.
    }

    @Override
    public void contextDestroyed(ServletContextEvent event) {
        // Do your job here during webapp shutdown.
    }

}

If you're not on Servlet 3.0 yet (which is already out for 2 years though), then you need to remove the @WebListener annotation and register it manually in web.xml as follows:

<listener>
    <listener-class>com.example.LuceneConfig</listener-class>
</listener>