ICEsoft.org Forums: ICEfaces, ICEmobile, ICEpdf

I tried to run the tree component example from the tutorial and get the following NullPointerException:

SCHWERWIEGEND: Error Rendering View[/newxhtml.xhtml]
java.lang.NullPointerException
at com.icesoft.faces.component.tree.TreeRenderer.encodeNode(TreeRenderer.java:376)
at com.icesoft.faces.component.tree.TreeRenderer.encodeParentAndChildNodes(TreeRenderer.java:277)
at com.icesoft.faces.component.tree.TreeRenderer.encodeChildren(TreeRenderer.java:234)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:380)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:126)
at
.................................

See the attachment for the XHTML-View and the managed bean.

The environment is:
Netbeans 6.8, JSF 2.0/Facelet, Glassfish V3 and the libraries:
icefaces-compat.jar
icefaces-comps-compat.jar
icefaces.jar

Try ICEFaces2 component-showcase. It works.
However when creating a custom app with only tree.xhml and
reequired other artifacts the operations ins server ( request)
go OK, but in response phase comes "Unable to set up WindowScope"

This is discussed in

http://jira.icefaces.org/browse/ICE-5297
http://jira.icefaces.org/browse/ICE-5220

The xhtml file you attached was empty, but the WindowScope server log messages have been found mostly to be related to hot deploying the application and haven't supplied any problems to sample app functionality.

You might want to review your xhtml, as it looks from the exception you have posted that there might be a problem with the encoding of whatever you have in the xhtml file.

@judy,
thanks for the reply; the xhtml file i posted is not empty, i downloaded and opened it (wth an editor like Notepad); here is the content:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:ice="http://www.icesoft.com/icefaces/component">
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>TODO supply a title</title>
</h:head>
<h:body>
<p>
TODO write content hier


<ice:tree id="tree"
value="#{tree.model}"
var="item"
hideRootNode="false"
hideNavigation="false"
>
<ice:treeNode>
<f:facet name="content">
<ice:panelGroup style="display: inline">
<ice:outputLink value="#{item.userObject.url}" target="_blank">
<ice:outputText value="#{item.userObject.text}" />
</ice:outputLink>
</ice:panelGroup>
</f:facet>
</ice:treeNode>
</ice:tree>
</p>
</h:body>
</html>

edruta wrote:

@judy,
thanks for the reply; the xhtml file i posted is not empty, i downloaded and opened it (wth an editor like Notepad); here is the content:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:ice="http://www.icesoft.com/icefaces/component">
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>TODO supply a title</title>
</h:head>
<h:body>
<p>
TODO write content hier


<ice:tree id="tree"
value="#{tree.model}"
var="item"
hideRootNode="false"
hideNavigation="false"
>
<ice:treeNode>
<f:facet name="content">
<ice:panelGroup style="display: inline">
<ice:outputLink value="#{item.userObject.url}" target="_blank">
<ice:outputText value="#{item.userObject.text}" />
</ice:outputLink>
</ice:panelGroup>
</f:facet>
</ice:treeNode>
</ice:tree>
</p>
</h:body>
</html>

Hi edruta,

I had the same problem, in my case I forgot to properly initalise back bean, try to find declaration of tree.model in your bean and go from there.

Maybe try at beginning simple code:

{
rootTreeNode = new DefaultMutableTreeNode();
PanelSelectUserObject rootObject = new PanelSelectUserObject(rootTreeNode);
rootObject.setText("Root");
rootObject.setExpanded(true);
rootTreeNode.setUserObject(rootObject);

// model is accessed by by the ice:tree component
model = new DefaultTreeModel(rootTreeNode);
loadLeaf("SampleNode", rootTreeNode);
}
public void loadLeaf(String name, DefaultMutableTreeNode root) {
DefaultMutableTreeNode freel = addNode(name, root);
PanelSelectUserObject iuoFreel = (PanelSelectUserObject) freel.getUserObject();
iuoFreel.setLeaf(true);
iuoFreel.setLeafIcon("./resources/icons/" + name + ".jpg");
}

Morning

Can you put a working tree app demo( ICEFaces 2.0 Alpha) with
minminum infra ( no templates, components etc.) to this site, because
I haven't managed to do it yet.

Thanks in advance.

Good evening

The tree examples started to work after the page
was instantiated thru binary (.jsf) call.
Not thru .xhtml :-)

For ex. thru jsp-page like
<%
response.sendRedirect("treeSimple.jsf");
%>

Make sure the tree is encased within a form.