446506 getAsyncContext ISE before startAsync on async dispatches

jetty-server/src/main/java/org/eclipse/jetty/server/Request.java

@@ -398,7 +398,7 @@ public class Request implements HttpServletRequest
     public AsyncContext getAsyncContext()
     {
         HttpChannelState state = getHttpChannelState();
-        if (_async==null || state.isInitial() && !state.isAsync())
+        if (_async==null || !state.isAsyncStarted())
             throw new IllegalStateException(state.getStatusString());
         
         return _async;

jetty-servlet/src/test/java/org/eclipse/jetty/servlet/AsyncServletTest.java

@@ -583,6 +583,17 @@ public class AsyncServletTest
         @Override
         public void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException
         {
+            // this should always fail at this point
+            try
+            {
+                request.getAsyncContext();
+                throw new IllegalStateException();
+            }
+            catch(IllegalStateException e)
+            {
+                // ignored
+            }
+            
             // System.err.println(request.getDispatcherType()+" "+request.getRequestURI());
             response.addHeader("history",request.getDispatcherType()+" "+request.getRequestURI());
             if (request instanceof ServletRequestWrapper || response instanceof ServletResponseWrapper)