Getting a ServletContext instance from a Portlet

Sometime when developing a portlet you need to access the ServletContext object. Both JSR, 168 and 286, doesn't provide a generic way to access it. To solve this issue Liferay offers a class called com.liferay.portal.kernel.portlet.PortletBag that enables you to access the ServletContext through its method called getServletContext(). To get a instance of PortletBag you should use the com.liferay.portal.kernel.portlet.PortletBagPool class like the snippet:

String portletId = "your-portlet-id";
PortletBag portletBag = PortletBagPool.get(portletId);
ServletContext servletContext = portletBag.getServletContext();