Can't instantiate JSF Custom Component

I'm hoping some of you expert (or at least seasoned) JSF custom component developers might be able to lend some insight into the "Can't instantiate class" problem. I have a custom component which extends another component (which happens to be Oracle ADF's panelGroup), and I've verified that everything is in place:
1. Component class uses correct component type referenced by faces-config.xml and tag class
2. Renderer type referenced in faces-config.xml matches that of the renderer type in component class
3. There is a default constructor (no args) for the component class, which also sets the renderer type
4. TLD with tag is correct
All classes are definitely in the classpath, as I have another custom component in the same packages which loads and is used just fine.
Any ideas would be appreciated.
Thanks,
Shawn Bertrand
Tyco Electronics

So, is no one else having any problems when using the new JSF components from Java Studio Creator 2 in their existing projects? I can make simple projects in Creator and run them on PointBase and Tomcat and can deploy and run from Eclipse using MyEclipse but I cannot get my existing project working and I am wondering if their is some sort of conflict between the new JSF components and legacy Struts stuff in that project or if perhaps Spring is someone interferering. Kind of at a loss right now...

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hi
i want such a custom component that render a table and table has the features of pagination and column sorting.
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Haroon
Message was edited by:
HaroonAnwarPADHYAR

I know two companies that offer JSF component for table pagination and sorting and AJAX based :
http://www.teamdev.com/quipukit/demo/datatable/DataTable_filteringAndPaging.jsf
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I have created a JSF cutom component , which has some javascript files. If i use the component within the same project my path for accessing the JS files is :- js/task.js (Its in public/html folder) .
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I want to make this component focusable, and when it's in focus I want the JTextField to have the focus
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Thanks for your reply! Your answer fixed my problems, so definitely thanks! I need to use escaped values for things like "<,&,#, etc", like the pound "amp" semicolon stuff. If I try to type out strings like these the forum unescapes them - fun part of posting forum questions about HTML escaping on HTML-based forums! :) I didn't realize an escaped querystring would still work as expected in a <a href ... />. You actually fixed both of my problems, and I... I do feel appropriately foolish now :) Had a feeling this might be a slaps forehead one. Thanks for the quick answer!,
Jim

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I have a custom component that has this line of code in the
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trace(this.Num1 + this.Num2);
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window
Num2:is a Number parameter created via component definition
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http://forums.adobe.com/thread/1141054
post 14
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http://forums.creativecow.net/thread/3/935431
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@Override
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The problem is, the form values that are tied to input boxes are null once validation error occurs.
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1st jsf custom component.. getting nullpointer Ex, what's wrong?

hi guys
I'm following this ex to create a custom component
http://today.java.net/pub/a/today/2004/07/16/jsfcustom.html
but I'm having problems like
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     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
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     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
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     at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
     at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:211)
     at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
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thanks ;)

hi guys
I'm following this ex to create a custom component
http://today.java.net/pub/a/today/2004/07/16/jsfcustom.html
but I'm having problems like
java.lang.NullPointerException
     at javax.faces.webapp.UIComponentTag.setupResponseWriter(UIComponentTag.java:929)
     at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:310)
     at org.apache.myfaces.taglib.core.ViewTag.doStartTag(ViewTag.java:70)
     at org.apache.jsp.Simple_jsp._jspx_meth_f_view_0(org.apache.jsp.Simple_jsp:114)
     at org.apache.jsp.Simple_jsp._jspService(org.apache.jsp.Simple_jsp:89)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:477)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:371)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
     at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
     at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
     at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:211)
     at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
     at org.mortbay.jetty.Server.handle(Server.java:313)
     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
     at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
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thanks ;)

JSF-Custom Component with EventHandling

Dear All,
I wanted to write my own component with event handling.
This is my requirement:
In my JSP, I'll put my cusom component tag for displaying 10 records and with prev and next buttons. after clicking prev button, i should get previouse 10 records and if i click next button, i should get next 10 records.
so, my component should render
1. 10 records
2. Prev button
3. Next button.
After clicking prev button it should render previouse 10 records and also prev and next button.
I do not know whether it is possible with JSF or not and also i'm not finding any example which explaining above situation.
My jsp should contain only my custom tag like
<mine:listRecords/>
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advanced thanks,
ram

It is certainly possible to write a component that embeds its own navigation and paging as you describe. On the other hand, you can also assemble this kind of functionality out of a combination of the existing simple components. The "repeater" example illustrates exactly the kind of application you are talking about (and the same techniques will work fine with the standard <h:dataTable> component as well).
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.getRequestParameterMap();
String newValue = (String) requestMap
.get(clientId);
if (null != newValue) {
input.setSubmittedValue(newValue);
Also providing the setProperties() from the custom tag class:
protected void setProperties(UIComponent component){
super.setProperties(component);
if (getValue()!=null){
if (isValueReference(getValue())){
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component.setValueBinding(VB_VALUE, vbTarget);
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((UIInput) component).setValue(value);
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if (getCompValue()!=null){
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component.setValueBinding(VB_COMPONENT_VALUE, vbCompTarget);
} else{
// ((UIInput) component).setValue(compValue);
component.getAttributes().put(VB_COMPONENT_VALUE,getCompValue());
if (getTable() != null && isValueReference(getTable())){
ValueBinding vbTable = FacesContext.getCurrentInstance().getApplication().
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component.setValueBinding(VB_TABLE, vbTable);
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if (getColumn() != null && isValueReference(getColumn())){
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ValueBinding vbClass = FacesContext.getCurrentInstance().getApplication().
createValueBinding(getStyleClass());
component.setValueBinding(VB_STYLE_CLASS, vbClass);
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ValueBinding vbRendered = FacesContext.getCurrentInstance().getApplication().
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Thanks

See this tutorial:
http://www.jsftutorials.net/components/index.html

JSF custom component: repear child components

I want to create something like this
<custom:mycomp var="item" value="#{aBean.TheArrayList}">
___<f:facet name="child">
______<h:commandLink actionListener="#{item.doSomething}">
_________<h:ouputText value="#{item.name}"/>
______</h:commandLink>
___</f:facet>
</custom:mycomp>
I know how to make a basic component with encodebegin and encodeend. But how can I make it repeat the facet for every object in the arraylist?

Create a custom ActionListener, implementing javax.faces.event.ActionListener, and calling it like this:
<h:commandButton action="doThis" value="Do This">
<f:actionListener type="my.package.MyActionListener" />
</h:commandButton>When the button is pressed, the processAction() method of MyActionListener is automatically executed.
Maybe this wasn't what you were looking for?
Edited by: bjornie on Aug 5, 2008 2:50 AM

Nesting JSF components in a custom component

I'm creating a new JSF custom component. my component needs to include an input text and a list box. my question is : how do I add these components to my JSF component ? I want to use to JSF component to render them rather then encoding the HTML myself. how can I do it ?
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I finally found how to set a default skin to a custom component so that users of my component will not have to set again the skinClass value of my component.
You have to create a defaults.css file at the root of your library and tell the compiler to take it into account.
The remaining problem is about the compiler. There are some steps before success and they are a bit mysterious/unclear....
I found 2 or 3 blog articles explaining those steps but the compiler arguments to use are all differents in each article...
Here are the links I found:
http://www.unitedmindset.com/jonbcampos/2010/05/12/creating-custom-spark-components/
http://www.betadesigns.co.uk/Blog/2010/05/14/default-skin-for-custom-flashbuilder-componen ts/
http://flexdevtips.blogspot.com/2009/06/default-stylesheet-in-swc-flex-library.html
Following the first article guidelines has been successful for me but I'm not marking this topic as Resolved because I'd like some answers about this whole thing...

Create complex custom component

Hi everyone!
I'm trying to create my own custom component in JSF. However I have several questions :
- It is not mandatory to create a renderer class, right ? the component can draw itself ?
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Josselin

Hi,
did you find a solution for your "composite" component problem?
I am also trying to create a custom component that contains several standard jsf components such as HtmlCommandLink and HtmlInputText.
I build all the standard components within my component programmatically using things like:
HtmlCommandLink link = (HtmlCommandLink) application.createComponent(HtmlCommandLink.COMPONENT_TYPE);
Also at the beginning of the encodeBegin I clear all children from my custom component using getChildren().clear()
and rerender the component based on my new internal model which I updated during the previous decoding of my component.
As a simple jsf custom tag it works ok, however, I am facing deep problems with action events as soon as I use the component within a jsf HtmlDataTable tag.
Am I missing something here?
Any ideas? Help is really really appreciated. This different behavior in different contexts is slowly but constantly driving me nuts.
cheers
hans

Stuck in custom component

Hello,
I'm just to stupid, but I can't get my custom component to work.
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When writing HTML instead another problem comes around, I always retrieve EL string, not the evaluated value. I cannot create binding that way it will get evaluated for resulting link (HTML-A).
I prefer having the EL evaluated because then it's simpler to include this message into my needed JavaScript code.
Can anyone give me some hints, lead me to a bit more sophisticated tutorials or stuff?
Regards,
Thorsten
null

Hi,
tell me please, why can't you create a binding?
I think i lost your idea...
IL

Can't instantiate JSF Custom Component

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