Java – no log output on contextdestroyed using servletcontextlistener and slf4j

I'm trying to write a message to the logger (vaadin) servlet has stopped, which uses slf4j and log4j2

For this purpose, I use servletcontextlistener, which logs messages when the application starts But when recording in the contextdestroyed method, I can't get any output... This is my implementation:

@WebListener
public class VaadinLogger implements servletcontextlistener {

    private static final Logger logger = LoggerFactory.getLogger(VaadinLogger.class);

    @Override
    public void contextInitialized(ServletContextEvent contextEvent) {
        // Remove appenders from JUL loggers
        SLF4JBridgeHandler.removeHandlersForRootLogger();

        // Install bridge
        SLF4JBridgeHandler.install();

        // Get servlet context
        ServletContext context = contextEvent.getServletContext();

        // Retrieve name
        String name = context.getServletContextName();

        // Log servlet init information
        logger.info("Start \"{}\"",name);
    }

    @Override
    public void contextDestroyed(ServletContextEvent contextEvent) {
        // Get servlet context
        ServletContext context = contextEvent.getServletContext();

        // Retrieve name
        String name = context.getServletContextName();

        // Log servlet destroy information
        logger.info("End \"{}\"{}",name,System.lineSeparator()));

        // Uninstall bridge
        SLF4JBridgeHandler.uninstall();
    }
}

At this point, I guess this may be because logging is no longer possible when contextdestroyed is called because they have been destroyed by the garbage collector

So now my question is, can I record that the servlet has stopped before the context is destroyed, or can I have the contextlistener execute before the log4j2 logger is destroyed?

Thank you in advance!

Solution

First, do you have log4j 2. 0 in your classpath X API, core and web jar? log4j-web-2. x. Jar also registers a context listener to turn off the logging subsystem when uninstalling web applications

If your listener runs after this, you will no longer be able to record anything

You can set < configuration status = "trace" To check what happened