JSF AJAXed custom component

Hi,
I've read the article on bpcatalog for enable jsf components with ajax. Everything is fine, but I can'y understand one thing:
In Strategy 2, how do we map the servlet that handles the ajax request (AjaxControllerServlet) to certan url. In strategy 1 this is done by decalrring phase listener in faces-config.xml and in strategy 3 this is done by maping url to servlet in web.xml.
Thanks in advance.

what IDE are you using?

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Message was edited by:
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I know two companies that offer JSF component for table pagination and sorting and AJAX based :
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Edited by: mota_nginya on Aug 9, 2010 6:31 AM

mota_nginya wrote:
Coming from this link http://forums.sun.com/thread.jspa?threadID=5446475&tstart=0
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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 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
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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)
     at org.mortbay.jetty.Server.handle(Server.java:313)
     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
     at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
     at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)do you know what's the problem
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)
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     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
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     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$RequestHandler.headerComplete(HttpConnection.java:830)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
     at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)do you know what's the problem
thanks ;)

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<component>
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<d:data_repeater>  <h:dataTable>
And it works fine.
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<h:column>
<%-- Visible checkbox for selection --%>
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binding="#{RepeaterBean.checked}"/>
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id="created"
binding="#{RepeaterBean.created}"
rendered="false"/>
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<h:column>
<f:facet name="header">
<h:outputText value="Account Id"/>               <!�Second Header row -- >
</f:facet>
<h:inputText id="accountId"
binding="#{RepeaterBean.accountId}"
required="true"
size="6"
value="#{customer.accountId}">
</h:inputText>
<h:message for="accountId"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Customer Name"/>               <!�Second Header row -- >
</f:facet>
<h:inputText id="name"
required="true"
size="50"
value="#{customer.name}">
</h:inputText>
<h:message for="name"/>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Symbol"/>
</f:facet>
<h:inputText id="symbol"
required="true"
size="6"
value="#{customer.symbol}">
<f:validateLength
maximum="6"
minimum="2"/>
</h:inputText>
<h:message for="symbol"/>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Total Sales"/>
</f:facet>
<h:outputText id="totalSales"
value="#{customer.totalSales}">
<f:convertNumber
type="currency"/>
</h:outputText>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Commands"/>
</f:facet>
<h:commandButton id="press"
action="#{RepeaterBean.press}"
immediate="true"
value="#{RepeaterBean.pressLabel}"
type="SUBMIT"/>
<h:commandLink id="click"
action="#{RepeaterBean.click}"
immediate="true">
<h:outputText
value="Click"/>
</h:commandLink>
</h:column>
</h:dataTable>
You may have a look at HTML source to prove that dataTable is already what you need:
<table id="myform:table">
<thead>
<tr><th colspan="6" scope="colgroup">Customer List</th></tr>
<tr>
<th scope="col"></th>
<th scope="col">Account Id</th>
<th scope="col">Customer Name</th>
<th scope="col">Symbol</th>
<th scope="col">Total Sales</th>
<th scope="col">Commands</th>
</tr>
</thead>
<tbody>
2.) The second trouble is still unsettled as previously. Right now I have different task at my job, and I can�t continue investigation of this problem.
But when you find smth., please let me know. I�ll be very grateful.
Regards,
Oleksa Stelmakh

How to construct the component tree in my custom component?Help!

Hi, i am writing a custom component like this:
public class HtmlCategory extends HtmlPanelGrid
     public void processRestoreState(javax.faces.context.FacesContext context,
            java.lang.Object state)
          setColumns(1);
          HtmlCommandLink link=new HtmlCommandLink();
          link.setValue("Let's Bingo");
          MyUtil.setActionListener(context,link,"#{temp.mytest}");
          UIParameter param=new UIParameter();
          param.setName("name");
          param.setValue("Robin!");
          link.getChildren().add(param);
          param.setParent(link);
          getChildren().add(link);
          link.setParent(this);
          super.processRestoreState(context,state);
}         you see, i want to construct the compont tree at Restore View phase this way,because the structure of the component tree will always be the same, so i don't the user to write extra code.
But the children of the component are not rendered,the renderer of the HtmlCategory component just extends the HtmlGridRenderer(myfaces) directly,and always calls the "super" methods in the encode methods of the renderer.
I got a message from the console:
Wrong columns attribute for PanelGrid id0:id4: -2147483648
but i have set the columns attribute in the code above, so what's happening? or please give some advice about how to render the component tree by myself in Restore View with the tree constructing code in the custom component class code,just lke the code above.
Best Regards:)
Robin

Well, i don't know if i have got my question clear.
usually, according to the tags you use in the jsf page, a component tree will be created at the Restore View phase,for example:
<f:form>
<h:panelGrid ...........>
          <h:dataTable ................>
          </h:dataTable>
   </h:panelGrid>
</f:form>but because i am writing a component for my web app, all the child components and their attributes are not likely to change. so i want to reduce the tags into one custom tag, and construct the component tree internally by myself.But it is not the case of backing bean.So i wrote the the code in the method:
public void processRestoreState(javax.faces.context.FacesContext context,java.lang.Object state)as it is shown in my orginal message.But it seems that it is not right way to construct my component tree.So where should i put the code that construct the component tree?Overriding the method :
public void processRestoreState(javax.faces.context.FacesContext context,java.lang.Object state)is not the right way?
Best Regards:)
Robin

Best strategy for variable aggregate custom component in dataTable

Hey group, I've got a question.
I'd like to write a custom component to display a series of editable Things in a datatable, but the structure of each Thing will vary depending on what type of Thing it is. So, some Things will display radio button groups (with each radio button selecting a small set of additional input elements, so we have a vertical array radio buttons and beside each radio button, a small number of additional input elements), some will display text-entry fields, and so on.
I'm wondering what the best strategy for tackling this sort of thing is. I'm sort of thinking I'll need to do something like dynamically add to the component tree in my custom component's encodeBegin(), and purge the extra (sub-) components in encodeEnd().
Decoding will be a bit of a challenge, maybe.
Or do I simply instantiate (via constructor calls, not createComponent()) the components I want and explicitly call their encode*() and decode() methods, without adding them to the view tree?
To add to the fun of all this, I'm only just learning Faces (having gone through the Dudney book, Mastering JSF, and writing some simpler custom components) and I don't have experience with anything other than plain vanilla JSP. (No EJB, no Struts, no Tapestry, no spiffy VisualDevStudioWysiwyg++ [bah humbug, I'm an emacs user]). I'm using JSP 2.0, JSF 1.1_01, JBoss 4.0.1 and JDK 1.4.2. No, I won't upgrade to 1.5 (yet).
Any hints, pointers to good sample code? I've looked at some of the sample code that came with the RI and I've tried to navigate the JSF Blueprints stuff, but I haven't really found anything on aggregating components into a custom component. Did I miss something obvious?
If this isn't a good question, please let me know how I can sharpen it up a bit.
Thanks.
John.

Hi,
We're doing something very similar. I had a look at the Tomahawk Date component, and it seems to dynamically created InputText components in the encodeEnd(). However, it doesn't decode this directly (it only expects a single textual value). I expect you may have to check the request yourself in decode().
Other ideas would be appreciated, though - I'm still new to JSF.

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