NPE in UIComponent$ComponentSystemEventListenerAdapter.processEvent when placing UITree in UIAccordionItem programmatically. ---------------------------------------------------------------------------------------------------------------------------- Key: RF-12987 URL: https://issues.jboss.org/browse/RF-12987 Project: RichFaces Issue Type: Bug Security Level: Public(Everyone can see) Components: component-tree Affects Versions: 4.3.1 Environment: JBoss 7.1.1.Final Mojarra 2.1.21 Reporter: Yuriy Granovskiy Fix For: 5-Tracking Attachments: trepanelnbar.zip NPE appears when we place UITree into UIAccordionItem programmatically. After postback we get: {panel:title NPE stacktrace} java.lang.NullPointerException javax.faces.component.UIComponent$ComponentSystemEventListenerAdapter.processEvent(UIComponent.java:2486) javax.faces.event.SystemEvent.processListener(SystemEvent.java:106) com.sun.faces.application.ApplicationImpl.processListeners(ApplicationImpl.java:2168) com.sun.faces.application.ApplicationImpl.invokeComponentListenersFor(ApplicationImpl.java:2116) com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:288) com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:246) javax.faces.component.UIComponentBase.publishAfterViewEvents(UIComponentBase.java:2201) javax.faces.component.UIComponentBase.doPostAddProcessing(UIComponentBase.java:1883) javax.faces.component.UIComponentBase.setParent(UIComponentBase.java:400) javax.faces.component.UIComponentBase$ChildrenList.add(UIComponentBase.java:2635) javax.faces.component.UIComponentBase$ChildrenList.add(UIComponentBase.java:2607) com.sun.faces.application.view.StateManagementStrategyImpl.restoreDynamicAdd(StateManagementStrategyImpl.java:393) com.sun.faces.application.view.StateManagementStrategyImpl.restoreDynamicActions(StateManagementStrategyImpl.java:314) com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:281) com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:188) com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:123) com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:453) com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:142) javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:303) com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:192) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116) com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) {panel} Works fine if we store some another components(such as command button) in the accordion item. But UITree causes the problem. Here is a component class: {code:java|title TreePanelBar.java} @FacesComponent( value = "extended.TreePanelBar" ) @ResourceDependencies( { @ResourceDependency( library = "org.richfaces", name = "ajax.reslib" ), @ResourceDependency( library = "org.richfaces", name = "base-component.reslib" ), @ResourceDependency( library = "org.richfaces", name = "togglePanel.js" ), @ResourceDependency( library = "org.richfaces", name = "accordion.js" ), @ResourceDependency( library = "org.richfaces", name = "AccordionItem.js" ), @ResourceDependency( library = "org.richfaces", name = "tree.js", target = "" ), @ResourceDependency( library = "", name = "richfaces-event.js", target = "" ), @ResourceDependency( library = "org.richfaces", name = "icons.ecss" ), @ResourceDependency( library = "org.richfaces", name = "accordion.ecss" ), @ResourceDependency( library = "org.richfaces", name = "tree.ecss", target = "" ) } ) public class TreePanelBar extends UIAccordion implements SystemEventListener, Serializable { private static final long serialVersionUID = -7698934343515911542L; protected enum Properties { node } public TreePanelBar() { UIViewRoot root = getFacesContext().getViewRoot(); root.subscribeToViewEvent( PreRenderViewEvent.class, this ); } /** {@inheritDoc} */ @Override public void processEvent( final SystemEvent event ) throws AbortProcessingException { if ( getChildCount() == 0 ) { Iterator<Object> iterator = getNode().getChildrenKeysIterator(); while ( iterator.hasNext() ) { Object childKey = iterator.next(); DataHolderTreeNodeImpl entry = (DataHolderTreeNodeImpl) getNode().getChild( childKey ); UIAccordionItem item = (UIAccordionItem) getFacesContext().getApplication().createComponent( getFacesContext(), UIAccordionItem.COMPONENT_TYPE, "org.richfaces.AccordionItemRenderer" ); item.setId( FacesContext.getCurrentInstance().getViewRoot().createUniqueId() ); item.setHeader( ( entry.getData() ).getLabel() ); getChildren().add( item ); // Adding a button programmatically. Works fine without tree. UICommand button = (UICommand) getFacesContext().getApplication().createComponent( UICommand.COMPONENT_TYPE ); button.setId(item.getId() + "_button"); button.setValue( "Button " + item.getHeader() ); item.getChildren().add( button ); //Adding a tree programmatically. NPE in javax.faces.component.UIComponent$ComponentSystemEventListenerAdapter.processEvent after postback. UITree tree = createTree( childKey, entry ); tree.setId( item.getId() + "_tree"); item.getChildren().add( tree ); } } } /** * @param childKey * @param entry * @return */ private UITree createTree( final Object childKey, final DataHolderTreeNodeImpl entry ) { UITree tree = (UITree) getFacesContext().getApplication().createComponent( UITree.COMPONENT_TYPE ); tree.setValue( entry ); UITreeNode uiNode = (UITreeNode) getFacesContext().getApplication().createComponent( UITreeNode.COMPONENT_TYPE ); uiNode.setTitle( (String) entry.getKey() ); uiNode.setIconCollapsed( entry.getData().getIcon() ); uiNode.setIconExpanded( entry.getData().getIcon() ); uiNode.setId( getFacesContext().getViewRoot().createUniqueId() ); tree.getChildren().add( uiNode ); return tree; } /** * @return */ public TreeNode getNode() { return (TreeNode) getStateHelper().eval( Properties.node ); } public void setNode( final TreeNode node ) { getStateHelper().put( Properties.node, node ); } /** {@inheritDoc} */ @Override public boolean isListenerForSource( final Object source ) { return true; } } {code} The exception is very similar to [RF-11423|https://issues.jboss.org/browse/RF-11423] The listener that is trying to get processed is for PostRenderEvent which is not mensioned in the component code.