I might have narrowed down the ClassCastException to the following
method in
"org.apache.myfaces.renderkit.html.HtmlLinkRenderBase.renderJavaScriptAnchorStart"
I am not to sure, but the ClassCastException could be comming from
((HtmlCommandLink)component).getOnclick();
I am viewing the source code via browser, unfortunately no line number
comes with it, so I cannot narrow to which cast is causing the error. It
says line 323. Perhaps someone can? I have included the function below
Hmm?
protected void renderJavaScriptAnchorStart(FacesContext facesContext,
ResponseWriter writer,
UIComponent component,
String clientId)
throws IOException
{
//Find form
UIComponent parent = component.getParent();
while (parent != null && !(parent instanceof UIForm))
{
parent = parent.getParent();
}
UIForm nestingForm = null;
String formName;
DummyFormResponseWriter dummyFormResponseWriter;
if (parent != null)
{
//link is nested inside a form
nestingForm = (UIForm)parent;
formName = nestingForm.getClientId(facesContext);
dummyFormResponseWriter = null;
}
else
{
//not nested in form, we must add a dummy form at the end of the
document
formName = DummyFormUtils.DUMMY_FORM_NAME;
dummyFormResponseWriter =
DummyFormUtils.getDummyFormResponseWriter(facesContext);
dummyFormResponseWriter.setWriteDummyForm(true);
}
StringBuffer onClick = new StringBuffer();
String commandOnclick;
if (component instanceof HtmlCommandLink)
{
commandOnclick = ((HtmlCommandLink)component).getOnclick();
}
else
{
commandOnclick =
(String)component.getAttributes().get(HTML.ONCLICK_ATTR);
}
if (commandOnclick != null)
{
onClick.append(commandOnclick);
onClick.append(';');
}
//call the clear_<formName> method
onClick.append(HtmlRendererUtils.getClearHiddenCommandFormParamsFunctionName(formName)).append("();");
String jsForm = "document.forms['" + formName + "']";
if
(MyfacesConfig.getCurrentInstance(facesContext.getExternalContext()).isAutoScroll())
{
JavascriptUtils.appendAutoScrollAssignment(onClick, formName);
}
//add id parameter for decode
String hiddenFieldName =
HtmlRendererUtils.getHiddenCommandLinkFieldName(formName);
onClick.append(jsForm);
onClick.append(".elements['").append(hiddenFieldName).append("']");
onClick.append(".value='").append(clientId).append("';");
if (nestingForm != null)
{
HtmlFormRendererBase.addHiddenCommandParameter(nestingForm,
hiddenFieldName);
}
else
{
dummyFormResponseWriter.addDummyFormParameter(hiddenFieldName);
}
//add child parameters
for (Iterator it = component.getChildren().iterator(); it.hasNext(); )
{
UIComponent child = (UIComponent)it.next();
if (child instanceof UIParameter)
{
String name = ((UIParameter)child).getName();
Object value = ((UIParameter)child).getValue();
renderLinkParameter(dummyFormResponseWriter, name, value,
onClick, jsForm, nestingForm);
}
}
// target
// todo: can we eliminate the if and rely on the second call only ?
// see MYFACES-310, specifically the comment by Emond Papegaaij. Will
try
// after testing framework is in place & tests are written.
String target = null;
if (component instanceof HtmlCommandLink)
{
target = ((HtmlCommandLink)component).getTarget();
}
else
{
target = (String)component.getAttributes().get(HTML.TARGET_ATTR);
}
if (target != null && target.trim().length() > 0) {
onClick.append(jsForm);
onClick.append(".target='");
onClick.append(target);
onClick.append("';");
}
// onSubmit
onClick.append("if("+jsForm+".onsubmit){"+jsForm+".onsubmit();}");
//submit
onClick.append(jsForm);
onClick.append(".submit();return false;"); //return false, so that
browser does not handle the click
writer.startElement(HTML.ANCHOR_ELEM, component);
writer.writeURIAttribute(HTML.HREF_ATTR, "#", null);
writer.writeAttribute(HTML.ONCLICK_ATTR, onClick.toString(), null);
}
On Thu, 2005-07-28 at 09:57 -0700, Curtney Jacobs wrote:
> Greetings Eric,
>
> what you have listed would just recursively call my encodeBegin() method
> in my renderer class, since this is where I am calling encodeRecursive
> () method in the first place. However, I did tried it and got errors, as
> expected. From what I have read and understood the UITabLabel suppose to
> use its own renderer to display itself.
>
> Has anyone else ran into this problem before?
>
> Curtney
>
> On Thu, 2005-07-28 at 08:22 -0500, Eric Kelm wrote:
> > I had problems when I tried to use this example as well. Look at the method
> > signatures. If I remember correctly the functions are not being called
> > correctly. E.G.
> >
> > Method signature:
> > public void encodeBegin(FacesContext context, UIComponent component)....
> >
> > Method Usage in the example:
> > {...
> > component.encodeBegin(context);
> > ...}
> >
> > Method should be:
> > {...
> > encodeBegin(context, component)
> > ...}
> >
> > I believe this is correct. There are other places in the code like this as
> > well. I believe this is a correct solution/
> >
> > ---------
> > Eric Kelm
> > Developer, VSG Worldwide LLC
> > Longview, TX 75601
> >
> > ->-----Original Message-----
> > ->From: Curtney Jacobs [mailto:[EMAIL PROTECTED]
> > ->Sent: Thursday, July 28, 2005 3:46 AM
> > ->To: [EMAIL PROTECTED]
> > ->Cc: MyFaces Discussion
> > ->Subject: Re: ClassCastException calling encodeBegin
> > ->
> > ->The following is an abbreviated (My stacktrace is really long) version
> > ->of my stacktrace:
> > ->
> > ->java.lang.ClassCastException: com.oim.faces.custom.tabbedpane.UITabLabel
> > -> at
> > ->org.apache.myfaces.renderkit.html.HtmlLinkRendererBase.renderJavaScriptAnc
> > ->horStart(HtmlLinkRendererBase.java:323)
> > -> at
> > ->org.apache.myfaces.renderkit.html.HtmlLinkRendererBase.renderCommandLinkSt
> > ->art(HtmlLinkRendererBase.java:215)
> > -> at
> > ->org.apache.myfaces.renderkit.html.HtmlLinkRendererBase.encodeBegin
> > ->(HtmlLinkRendererBase.java:146)
> > -> at javax.faces.component.UIComponentBase.encodeBegin
> > ->(UIComponentBase.java:317)
> > ->at com.oim.faces.custom.tabbedpane.TabbedPaneRenderer.encodeRecursive
> > ->(TabbedPaneRenderer.java:406)
> > ->
> > ->
> > ->As you can see from the above, what triggers the exception is when I
> > ->call encodeRecursive in my renderer, which calls encodeBegin() method on
> > ->my component (UITabLabel). See previous post for implementation details.
> > ->
> > ->_Curtney
> > ->
> > ->
> > ->On Thu, 2005-07-28 at 10:25 +0200, Martin Marinschek wrote:
> > ->> Find out which classes are involved in the failed casting and then get
> > ->> back to us.
> > ->>
> > ->> regards,
> > ->>
> > ->> Martin
> > ->>
> > ->> On 7/28/05, Curtney Jacobs <[EMAIL PROTECTED]> wrote:
> > ->> Greetings!
> > ->>
> > ->> I have copied a custom component from "JavaServer Faces" by
> > ->> O'Reilly to
> > ->> use in my myfaces application and I am getting
> > ->> ClassCastException
> > ->> whenever I call "component.encodeBegin(context)": The
> > ->> following code is
> > ->> what throws the ClassCastException:
> > ->>
> > ->> Calling code:
> > ->>
> > ->> UITabLabel tabLabel = (UITabLabel)child.getFacet("label");
> > ->> encodeRecursive(context, tabLabel);
> > ->>
> > ->> Called Method implementation:
> > ->>
> > ->> private void encodeRecursive (FacesContext context,
> > ->> UIComponent
> > ->> component) throws IOException {
> > ->> if (!component.isRendered()) {
> > ->> return;
> > ->> }
> > ->> //throws ClassCastException
> > ->> component.encodeBegin (context);
> > ->>
> > ->> if (component.getRendersChildren()) {
> > ->> component.encodeChildren(context);
> > ->> } else {
> > ->> Iterator it = component.getChildren
> > ->> ().iterator();
> > ->> while (it.hasNext()) {
> > ->> UIComponent child =
> > ->> (UIComponent)it.next();
> > ->> encodeRecursive(context,
> > ->> child);
> > ->> }
> > ->> }
> > ->> component.encodeEnd(context);
> > ->> }
> > ->>
> > ->>
> > ->> The following is the custom component from the Book:
> > ->>
> > ->> public class UITabLabel extends UICommand {
> > ->>
> > ->> public static final String COMPONENT_TYPE =
> > ->> "com.oim.faces.TabLabel";
> > ->> public static final String COMPONENT_FAMILY =
> > ->> "javax.faces.Command";
> > ->>
> > ->> public UITabLabel () {
> > ->> super();
> > ->> setRendererType ("javax.faces.Link");
> > ->> }
> > ->>
> > ->> public String getFamily () {
> > ->> return COMPONENT_FAMILY;
> > ->> }
> > ->>
> > ->> public void broadcast (FacesEvent event) {
> > ->> if (event instanceof ActionEvent) {
> > ->> processAction((ActionEvent)event);
> > ->> }
> > ->> }
> > ->>
> > ->>
> > ->> private void processAction (ActionEvent event) {
> > ->> UIComponent panelTab = getParent();
> > ->> UIComponent panelTabbedPane =
> > ->> panelTab.getParent();
> > ->> Iterator it = panelTabbedPane.getChildren
> > ->> ().iterator();
> > ->> while (it.hasNext()) {
> > ->> UIComponent panel =
> > ->> (UIComponent)it.next();
> > ->> if (panel.equals(panelTab)) {
> > ->> panel.setRendered(true);
> > ->> } else {
> > ->> panel.setRendered(false);
> > ->> }
> > ->> }
> > ->> }
> > ->>
> > ->> public MethodBinding getAction () {
> > ->> return null;
> > ->> }
> > ->>
> > ->> public void setAction (MethodBinding action) {
> > ->> throw new UnsupportedOperationException();
> > ->> }
> > ->>
> > ->> public MethodBinding getActionListener () {
> > ->> return null;
> > ->> }
> > ->>
> > ->> public void addActionListener (ActionListener
> > ->> listener) {
> > ->> throw new UnsupportedOperationException();
> > ->> }
> > ->>
> > ->> public ActionListener[] getActionListeners () {
> > ->> return new ActionListener[0];
> > ->> }
> > ->>
> > ->> public void removeActionListener (ActionListener
> > ->> listener) {
> > ->> throw new UnsupportedOperationException ();
> > ->> }
> > ->>
> > ->> }
> > ->>
> > ->> Any Ideas?
> > ->>
> > ->> Curtney
> > ->>
> > ->>
> >
> >
>
