That's the source code for GuiceServletContextListener:
public abstract class GuiceServletContextListener
implements ServletContextListener {
static final String INJECTOR_NAME = Injector.class.getName();
public void contextInitialized(ServletContextEvent servletContextEvent) {
final ServletContext servletContext =
servletContextEvent.getServletContext();
// Set the Servletcontext early for those people who are using this
class.
// NOTE(dhanji): This use of the servletContext is deprecated.
GuiceFilter.servletContext = new
WeakReference<ServletContext>(servletContext);
Injector injector = getInjector();
injector.getInstance(InternalServletModule.BackwardsCompatibleServletContextProvider.class)
.set(servletContext);
servletContext.setAttribute(INJECTOR_NAME, injector);
}
public void contextDestroyed(ServletContextEvent servletContextEvent) {
ServletContext servletContext = servletContextEvent.getServletContext();
servletContext.removeAttribute(INJECTOR_NAME);
}
/**
* Override this method to create (or otherwise obtain a reference to)
your
* injector.
*/
protected abstract Injector getInjector();
}
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