OO-1506: if the issue occured, trigger a full page refresh instead of a red screen

src/main/java/org/olat/core/gui/components/CannotReplaceDOMFragmentException.java

+/**
+ * <a href="http://www.openolat.org">
+ * OpenOLAT - Online Learning and Training</a><br>
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License"); <br>
+ * you may not use this file except in compliance with the License.<br>
+ * You may obtain a copy of the License at the
+ * <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache homepage</a>
+ * <p>
+ * Unless required by applicable law or agreed to in writing,<br>
+ * software distributed under the License is distributed on an "AS IS" BASIS, <br>
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
+ * See the License for the specific language governing permissions and <br>
+ * limitations under the License.
+ * <p>
+ * Initial code contributed and copyrighted by<br>
+ * frentix GmbH, http://www.frentix.com
+ * <p>
+ */
+package org.olat.core.gui.components;
+
+/**
+ * 
+ * Initial date: 02.04.2015<br>
+ * @author srosse, stephane.rosse@frentix.com, http://www.frentix.com
+ *
+ */
+public class CannotReplaceDOMFragmentException extends Exception {
+
+	private static final long serialVersionUID = 3257788145928610855L;
+
+	public CannotReplaceDOMFragmentException(String msg) {
+		super(msg);
+	}
+
+}

src/main/java/org/olat/core/gui/components/Window.java

@@ -449,8 +449,14 @@ public class Window extends AbstractComponent {
 											long durationBeforeHandleDirties = System.currentTimeMillis() - debug_start;
 											log.debug("Perf-Test: Window durationBeforeHandleDirties=" + durationBeforeHandleDirties);
 										}
-										Command co = handleDirties();
-										//fxdiff FXOLAT-119: update business path
+										Command co;
+										try {
+											co = handleDirties();
+										} catch (CannotReplaceDOMFragmentException e) {
+											String reRenderUri = buildURIFor(this, timestampID, null);
+											co = CommandFactory.createParentRedirectTo(reRenderUri);
+										}
+										//update the business path
 										Command co2 = handleBusinessPath(ureq);
 										if (isDebugLog) {
 											long durationAfterHandleDirties = System.currentTimeMillis() - debug_start;
@@ -861,7 +867,7 @@ public class Window extends AbstractComponent {
 	 * @return a updateUI-Command or null if there are no dirty components (normally not the case for sync (user-click) request, but often the case 
 	 * for pull request, since nothing has changed yet on the screen.
 	 */
-	public Command handleDirties() {
+	public Command handleDirties() throws CannotReplaceDOMFragmentException {
 		// need to sync to window, since the dispatching must be finished so that the render tree is stable before we collect the dirties.
 		// more accurately, the synchronized is needed when other classes than window call this method.
 		synchronized(this) {
@@ -933,7 +939,7 @@ public class Window extends AbstractComponent {
 							}
 							boolean wasDomR = toRender.isDomReplaceable();
 							if (!wasDomR) {
-								throw new AssertException("cannot replace as dom fragment:"+toRender.getComponentName()+" ("+toRender.getClass().getName()+"),"+toRender.getExtendedDebugInfo());
+								throw new CannotReplaceDOMFragmentException("cannot replace as dom fragment:"+toRender.getComponentName()+" ("+toRender.getClass().getName()+"),"+toRender.getExtendedDebugInfo());
 							}
 							
 							Panel wrapper = new Panel("renderpanel");

src/main/java/org/olat/core/gui/control/winmgr/AjaxController.java

@@ -48,6 +48,7 @@ import org.olat.core.dispatcher.mapper.manager.MapperKey;
 import org.olat.core.gui.UserRequest;
 import org.olat.core.gui.UserRequestImpl;
 import org.olat.core.gui.Windows;
+import org.olat.core.gui.components.CannotReplaceDOMFragmentException;
 import org.olat.core.gui.components.Component;
 import org.olat.core.gui.components.Window;
 import org.olat.core.gui.components.panel.Panel;
@@ -133,21 +134,28 @@ public class AjaxController extends DefaultController {
 					reload = cc.wishAsyncReload(ureq, false);
 				}
 				
-				// check for dirty components now.
-				wboImpl.fireCycleEvent(Window.BEFORE_INLINE_RENDERING);
-				Command updateDirtyCom = window.handleDirties();
-				wboImpl.fireCycleEvent(Window.AFTER_INLINE_RENDERING);
-				
-				if (updateDirtyCom != null) {
-					synchronized (windowcommands) { //o_clusterOK by:fj
-						windowcommands.add(new WindowCommand(wboImpl, updateDirtyCom));
-						if(reload) {
-							String timestampID = ureq.getTimestampID();
-							String reRenderUri = window.buildURIFor(window, timestampID, null);
-							Command rmrcom = CommandFactory.createParentRedirectTo(reRenderUri);
-							windowcommands.add(new WindowCommand(wboImpl, rmrcom));
+				try {
+					// check for dirty components now.
+					wboImpl.fireCycleEvent(Window.BEFORE_INLINE_RENDERING);
+					Command updateDirtyCom = window.handleDirties();
+					wboImpl.fireCycleEvent(Window.AFTER_INLINE_RENDERING);
+					
+					if (updateDirtyCom != null) {
+						synchronized (windowcommands) { //o_clusterOK by:fj
+							windowcommands.add(new WindowCommand(wboImpl, updateDirtyCom));
+							if(reload) {
+								String timestampID = ureq.getTimestampID();
+								String reRenderUri = window.buildURIFor(window, timestampID, null);
+								Command rmrcom = CommandFactory.createParentRedirectTo(reRenderUri);
+								windowcommands.add(new WindowCommand(wboImpl, rmrcom));
+							}
 						}
 					}
+				} catch (CannotReplaceDOMFragmentException e) {
+					String timestampID = ureq.getTimestampID();
+					String reRenderUri = window.buildURIFor(window, timestampID, null);
+					Command rmrcom = CommandFactory.createParentRedirectTo(reRenderUri);
+					windowcommands.add(new WindowCommand(wboImpl, rmrcom));
 				}
 				return extractMediaResource(false);
 			}