gistfile1.java

public void observeAssemblerBeforeApplicationDestroyed(@Observes final AssemblerAfterApplicationCreated event) {
        final ContainerSystem containerSystem = SystemInstance.get().getComponent(ContainerSystem.class);
        final AppContext appContext = containerSystem.getAppContext(event.getApp().appId);
        final List<WebContext> webContexts = appContext.getWebContexts();
        for (WebContext webContext : webContexts) {
            final ClassLoader classLoader = webContext.getClassLoader();
            final String id = webContext.getId();
            TrackerService.get().registerClassloaderForAppId(id, classLoader);
        }
    }

    public void observeAssemblerBeforeApplicationDestroyed(@Observes final AssemblerBeforeApplicationDestroyed event) {
        final ContainerSystem containerSystem = SystemInstance.get().getComponent(ContainerSystem.class);
        final AppContext appContext = containerSystem.getAppContext(event.getApp().appId);
        final List<WebContext> webContexts = appContext.getWebContexts();
        for (WebContext webContext : webContexts) {
            final ClassLoader classLoader = webContext.getClassLoader();
            TrackerService.get().unregisterClassloader(classLoader);
        }
    }