I was having this problem too, until I realized that I had specified the wrong layout in setContentView() of the onCreate() method of the FragmentActivity. The id passed into FragmentTransaction.add(), in your case R.id.feedContentContainer, must be a child of the layout specified in setContentView(). You didn’t show us your onCreate() method, so perhaps this is … Read more
Just remove the annotation @WebServlet(“/ControllerServlet”), from the ControllerServlet, because it already added in the web.xml.
The problem is that what you are trying to do shouldn’t be done. You shouldn’t be inflating fragments inside other fragments. From Android’s documentation: Note: You cannot inflate a layout into a fragment when that layout includes a <fragment>. Nested fragments are only supported when added to a fragment dynamically. While you may be able … Read more