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2012-05-04T16:32:23.947
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2012-05-04T16:32:23.947
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2017-05-23T12:33:45.557
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<code>AnnotationMethodHandlerAdapter.invokeHandlerMethod()</code> takes care of invoking handler methods. Here, a <code>ModelAndView</code> will be retrieved via <code>ServletHandlerMethodInvoker.getModelAndView()</code>. In your case, <code>getModelAndView()</code> gets provided the handler method's <code>null</code> return value. The <code>getModelAndView()</code> method checks for the return value's type, but <a href="https://stackoverflow.com/questions/2707322/what-is-null-in-java">as in Java null is never an instanceof any class</a>, that method's logic will create a new <code>ModelAndView</code>. A new <code>ModelAndView</code> has initially its view property set to <code>null</code>. Then later back up the call stack, in <code>DispatcherServlet.doDispatch()</code>, there is a test if the <code>ModelAndView</code> object has a <code>View</code> associated with it ( <code>mv.hasView()</code> ). Because <code>view == null</code>, <code>doDispatch()</code>'s logic calls <code>mv.setViewName(getDefaultViewName(request))</code>. It delegates to the registered <code>RequestToViewNameTranslator</code>, whose default implementation is <code>DefaultRequestToViewNameTranslator</code>. This subclass translates the request URI into a view name, in your case <code>form</code>. Later in <code>doDispatch()</code>, via <code>render()</code> -> <code>resolveViewName()</code>, this sample's <code>ViewResolver</code>s are provided with the view name <code>form</code>. Only one <code>ViewResolver</code>, <code>InternalResourceViewResolver</code> is used in this sample. Also, this <code>InternalResourceViewResolver</code> was configured in <code>src/main/webapp/WEB-INF/spring/appServlet/servlet-context.xml</code> to add the prefix <code>/WEB-INF/views/</code> and the suffix <code>.jsp</code> to the view name. So in total, it will create a <code>View</code> using the JSP file <code>/WEB-INF/views/form.jsp</code>. Luckily, a JSP file exists at exactly this location.
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