Java Code Examples for javax.servlet.ServletContext#removeAttribute()

/**
 * Close Spring's web application context for the given servlet context.
 * <p>If overriding {@link #loadParentContext(ServletContext)}, you may have
 * to override this method as well.
 * @param servletContext the ServletContext that the WebApplicationContext runs in
 */
public void closeWebApplicationContext(ServletContext servletContext) {
	servletContext.log("Closing Spring root WebApplicationContext");
	try {
		if (this.context instanceof ConfigurableWebApplicationContext) {
			((ConfigurableWebApplicationContext) this.context).close();
		}
	}
	finally {
		ClassLoader ccl = Thread.currentThread().getContextClassLoader();
		if (ccl == ContextLoader.class.getClassLoader()) {
			currentContext = null;
		}
		else if (ccl != null) {
			currentContextPerThread.remove(ccl);
		}
		servletContext.removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
	}
}
 

/**
 * Handles Eureka cleanup, including shutting down all monitors and yielding all EIPs.
 *
 * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
 */
@PreDestroy
public void destroy() {
    try {
        logger.info("{} Shutting down Eureka Server..", new Date().toString());
        ServletContext sc = context.getServletContext();
        sc.removeAttribute(EurekaServerContext.class.getName());

        DiscoveryManager.getInstance().shutdownComponent();
        destroyEurekaServerContext();
        destroyEurekaEnvironment();

    } catch (Throwable e) {
        logger.error("Error shutting down eureka", e);
    }
    logger.info("{} Eureka Service is now shutdown...", new Date().toString());
}
 

/**
 * Destroyes the portal admin config and removes it from servlet context.
 *
 * @param servletContext the servlet context.
 */
private void destroyAdminConfiguration(ServletContext servletContext)
{
    AdminConfiguration adminConfig = (AdminConfiguration)
            servletContext.getAttribute(ADMIN_CONFIG_KEY);
    if (adminConfig != null)
    {
        try
        {
            adminConfig.destroy();
            if (LOG.isInfoEnabled())
            {
                LOG.info("Pluto Portal Admin Config destroyed.");
            }
        } catch (DriverConfigurationException ex)
        {
            LOG.error("Unable to destroy portal admin config: "
                    + ex.getMessage(), ex);
        } finally
        {
            servletContext.removeAttribute(ADMIN_CONFIG_KEY);
        }
    }
}
 

/**
 * Close Spring's web application context for the given servlet context. If
 * the default {@link #loadParentContext(ServletContext)} implementation,
 * which uses ContextSingletonBeanFactoryLocator, has loaded any shared
 * parent context, release one reference to that shared parent context.
 * <p>If overriding {@link #loadParentContext(ServletContext)}, you may have
 * to override this method as well.
 * @param servletContext the ServletContext that the WebApplicationContext runs in
 */
public void closeWebApplicationContext(ServletContext servletContext) {
	servletContext.log("Closing Spring root WebApplicationContext");
	try {
		if (this.context instanceof ConfigurableWebApplicationContext) {
			((ConfigurableWebApplicationContext) this.context).close();
		}
	}
	finally {
		ClassLoader ccl = Thread.currentThread().getContextClassLoader();
		if (ccl == ContextLoader.class.getClassLoader()) {
			currentContext = null;
		}
		else if (ccl != null) {
			currentContextPerThread.remove(ccl);
		}
		servletContext.removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
		if (this.parentContextRef != null) {
			this.parentContextRef.release();
		}
	}
}
 

private void toExit(HttpServletRequest request, HttpServletResponse response) throws IOException {
	HttpSession session = request.getSession();
	if (session.getAttribute("admin") == null) {
		session.invalidate();
		response.sendRedirect("index.jsp");
		return;
	}
	Users user = (Users) session.getAttribute("user");
	ServletContext application = session.getServletContext();
	application.removeAttribute(((Users) session.getAttribute("user")).getUname());
	Integer onlineNum = (Integer) application.getAttribute("onlineNum");
	if (onlineNum > 0) {
		application.setAttribute("onlineNum", onlineNum - 1);
	}
	Object signinid = session.getAttribute("signinid");
	int uid = user.getUid();
	Timestamp sdtime = Times.getSystemTime();
	usersDao.updateOnline(0, uid);
	signinDao.updateSignin((Integer) signinid, sdtime);
	response.sendRedirect("index.jsp");
}
 

@Override
public void contextDestroyed(ServletContextEvent event) {
	ServletContext servletContext = event.getServletContext();
	if (servletContext.getAttribute(CONTEXT_PATH_ATTRIBUTE_NAME) != null) {
		servletContext.removeAttribute(CONTEXT_PATH_ATTRIBUTE_NAME);
	}
}
 

/**
 * Stop associated {@link ClassLoader} and implement the requirements
 * of {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
 *
 * @exception LifecycleException if this component detects a fatal error
 *  that prevents this component from being used
 */
@Override
protected void stopInternal() throws LifecycleException {

    if (log.isDebugEnabled())
        log.debug(sm.getString("webappLoader.stopping"));

    setState(LifecycleState.STOPPING);

    // Remove context attributes as appropriate
    ServletContext servletContext = context.getServletContext();
    servletContext.removeAttribute(Globals.CLASS_PATH_ATTR);

    // Throw away our current class loader if any
    if (classLoader != null) {
        try {
            classLoader.stop();
        } finally {
            classLoader.destroy();
        }

        // classLoader must be non-null to have been registered
        try {
            String contextName = context.getName();
            if (!contextName.startsWith("/")) {
                contextName = "/" + contextName;
            }
            ObjectName cloname = new ObjectName(context.getDomain() + ":type=" +
                    classLoader.getClass().getSimpleName() + ",host=" +
                    context.getParent().getName() + ",context=" + contextName);
            Registry.getRegistry(null, null).unregisterComponent(cloname);
        } catch (Exception e) {
            log.warn("LifecycleException ", e);
        }
    }


    classLoader = null;
}
 

/**
 * Destroyes the portal driver config and removes it from servlet context.
 *
 * @param servletContext the servlet context.
 */
private void destroyDriverConfiguration(ServletContext servletContext)
{
    DriverConfiguration driverConfig = (DriverConfiguration)
            servletContext.getAttribute(DRIVER_CONFIG_KEY);
    if (driverConfig != null)
    {
        servletContext.removeAttribute(DRIVER_CONFIG_KEY);
    }
}
 

/**
 * Stop associated {@link ClassLoader} and implement the requirements
 * of {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
 *
 * @exception LifecycleException if this component detects a fatal error
 *  that prevents this component from being used
 */
@Override
protected void stopInternal() throws LifecycleException {

    if (log.isDebugEnabled())
        log.debug(sm.getString("webappLoader.stopping"));

    setState(LifecycleState.STOPPING);

    // Remove context attributes as appropriate
    if (container instanceof Context) {
        ServletContext servletContext =
            ((Context) container).getServletContext();
        servletContext.removeAttribute(Globals.CLASS_PATH_ATTR);
    }

    // Throw away our current class loader
    if (classLoader != null) {
        ((Lifecycle) classLoader).stop();
        DirContextURLStreamHandler.unbind(classLoader);
    }

    try {
        StandardContext ctx=(StandardContext)container;
        String contextName = ctx.getName();
        if (!contextName.startsWith("/")) {
            contextName = "/" + contextName;
        }
        ObjectName cloname = new ObjectName
            (MBeanUtils.getDomain(ctx) + ":type=WebappClassLoader,context="
             + contextName + ",host=" + ctx.getParent().getName());
        Registry.getRegistry(null, null).unregisterComponent(cloname);
    } catch (Exception e) {
        log.error("LifecycleException ", e);
    }

    classLoader = null;
}
 

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		ServletContext ctx = request.getServletContext();
		ctx.setAttribute("User", "Pankaj");
		String user = (String) ctx.getAttribute("User");
		ctx.removeAttribute("User");
		
		HttpSession session = request.getSession();
		session.invalidate();
		
		PrintWriter out = response.getWriter();
		out.write("Hi "+user);
}
 

@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
	ServletContext sc = getServletContext();
	sc.removeAttribute("forgot");
	sc.removeAttribute("failed");
	response.sendRedirect("login.jsp");
}
 

@Override
public void contextDestroyed(ServletContextEvent sce) {
    ServletContext servletContext = sce.getServletContext();
    servletContext.removeAttribute(INJECTOR_ATTRIBUTE_NAME);
    servletContext.removeAttribute(KERNEL_ATTRIBUTE_NAME);
    if (kernel != null) {
        try {
            Seed.disposeKernel(kernel);
        } finally {
            kernel = null;
        }
    }
}
 

@Override
public void contextDestroyed(ServletContextEvent servletContextEvent)
{
	ServletContext sc = servletContextEvent.getServletContext();
	sc.removeAttribute(Injector.class.getName());
	super.contextDestroyed(servletContextEvent);
}
 

@Override
public void contextDestroyed(ServletContextEvent sce) {
    makeFileCollectorDestroyer().stopFileCollector();
    ServletContext servletContext = sce.getServletContext();
    EverrestProcessor processor = (EverrestProcessor)servletContext.getAttribute(EverrestProcessor.class.getName());
    if (processor != null) {
        processor.stop();
    }
    servletContext.removeAttribute(EverrestProcessor.class.getName());
    servletContext.removeAttribute(EverrestConfiguration.class.getName());
    servletContext.removeAttribute(Application.class.getName());
    servletContext.removeAttribute(DependencySupplier.class.getName());
    servletContext.removeAttribute(ResourceBinder.class.getName());
    servletContext.removeAttribute(ApplicationProviderBinder.class.getName());
}
 

@Override
public void sessionDestroyed(HttpSessionEvent event) {
	HttpSession session = event.getSession();
	Users user = (Users) session.getAttribute("user");
	if (user == null) {
		return;
	}
	ServletContext servletContext = event.getSession().getServletContext();
	servletContext.removeAttribute(((Users) session.getAttribute("user")).getUname());
	Integer onlineNum = (Integer) servletContext.getAttribute("onlineNum");
	if (onlineNum > 0) {
		servletContext.setAttribute("onlineNum", onlineNum - 1);
	}
	Object signinid = session.getAttribute("signinid");

	if (user == null || signinid == null) {
		return;
	}
	int uid = user.getUid();
	Timestamp sdtime = Times.getSystemTime();
	usersDao.updateOnline(0, uid);
	signinDao.updateSignin((Integer) signinid, sdtime);

	Object adid = session.getAttribute("adid");
	Admins admin = (Admins) session.getAttribute("admin");
	if (admin == null || adid == null) {
		return;
	}

	int aid = admin.getAid();
	adminsDao.updateOnline(0, aid);
	adloginDao.updateSignin((Integer) adid, sdtime);
}
 

/**
 * Stop associated {@link ClassLoader} and implement the requirements
 * of {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
 *
 * @exception LifecycleException if this component detects a fatal error
 *  that prevents this component from being used
 */
@Override
protected void stopInternal() throws LifecycleException {

    if (log.isDebugEnabled())
        log.debug(sm.getString("webappLoader.stopping"));

    setState(LifecycleState.STOPPING);

    // Remove context attributes as appropriate
    if (container instanceof Context) {
        ServletContext servletContext =
            ((Context) container).getServletContext();
        servletContext.removeAttribute(Globals.CLASS_PATH_ATTR);
    }

    // Throw away our current class loader
    if (classLoader != null) {
        ((Lifecycle) classLoader).stop();
        DirContextURLStreamHandler.unbind(classLoader);
    }

    try {
        StandardContext ctx=(StandardContext)container;
        String contextName = ctx.getName();
        if (!contextName.startsWith("/")) {
            contextName = "/" + contextName;
        }
        ObjectName cloname = new ObjectName
            (MBeanUtils.getDomain(ctx) + ":type=WebappClassLoader,context="
             + contextName + ",host=" + ctx.getParent().getName());
        Registry.getRegistry(null, null).unregisterComponent(cloname);
    } catch (Exception e) {
        log.error("LifecycleException ", e);
    }

    classLoader = null;
}
 

private static void disposeApplicationContext(ServletContext servletContext, ApplicationContext applicationContext) {
	if(applicationContext==null) {
		return;
	}
	servletContext.removeAttribute(ServerFrontend.LDP4J_APPLICATION_CONTEXT);
	try {
		ApplicationEngine.engine().dispose(applicationContext);
		LOGGER.info("LDP4j Application '{}' ({}) shutdown.",applicationContext.applicationName(),applicationContext.applicationClassName());
	} catch (ApplicationContextTerminationException e) {
		LOGGER.error(String.format("Could not shutdown LDP4j Application '%s' (%s) due to an unexpected context failure. Full stacktrace follows:",applicationContext.applicationName(),applicationContext.applicationClassName()),e);
	}
}
 

public void contextDestroyed(ServletContext context) {
	try {
		log.info("Shutting down Eureka Server..");
		context.removeAttribute(EurekaServerContext.class.getName());

		destroyEurekaServerContext();
		destroyEurekaEnvironment();

	}
	catch (Throwable e) {
		log.error("Error shutting down eureka", e);
	}
	log.info("Eureka Service is now shutdown...");
}
 

@Override
public void contextDestroyed(ServletContextEvent servletContextEvent) {
	ServletContext sc = servletContextEvent.getServletContext();
	sc.removeAttribute(Injector.class.getName());
	super.contextDestroyed(servletContextEvent);
}
 

@Override
public void contextDestroyed(ServletContextEvent servletContextEvent) {
    ServletContext servletContext = servletContextEvent.getServletContext();
    servletContext.removeAttribute(OBJECT_GRAPH_NAME);
}