CLASSCASTEXCEPTION on page load

I have been working on developing some extensions to a page in Oracle Sourcing. I get it to a point where I have a part working and then it all goes wrong and I get this error.
Even if I back out all the changes this error wont go away. The only way I have found to get things going again is to totally delete the development tree and then build it up again from scratch.
I just cant figure out what is causing this.
Any ideas?

Steps to re-produce ....
1. Create a new workspace and project..
2. Add in the server.xml files for the application pon.
3. Also copy the pon java files to the myclasses directory.
4. Create a jsp to call the sourcing home page. Run
5. Get into the home page and can go to the create RFQ screen.
6. Now create a new Business Component. Create a new VO that extends the VO
oracle.apps.pon.negociation.creation.server.AuctionHeadersALLVO.
Add the following to the query
select ...
lv.meaning TWG_REQUEST_TYPE,
lv.lookup_code TWG_REQUEST_TYPE_CODE,
MCK.CONCATENATED_SEGMENTS TWG_PRODUCT_HIERARCHY,
AuctionHeadersALLEO.EXT_ATTRIBUTE2 TWG_PRODUCT_HIERARCHY_ID,
AuctionHeadersALLEO.EXT_ATTRIBUTE3 TWG_BUYER_ID,
pp.full_name TWG_BUYER_NAME
from ....
, MTL_CATEGORIES_KFV MCK
, fnd_lookup_values_vl lv
, per_people_x pp
where ...
AND AuctionHeadersALLEO.EXT_ATTRIBUTE2 = MCK.CATEGORY_ID
AND lv.lookup_type = 'TWG_RFQ_REQ_TYPE'
AND AuctionHeadersALLEO.EXT_ATTRIBUTE1 = lv.lookup_code
AND AuctionHeadersALLEO.EXT_ATTRIBUTE3 = pp.person_id
Generate the View Row Class
Now create a subsitition for the existing AuctionHeadersALLVO with the new one
(in the new Business Component).
Finally go to the Project Settings and add the flag -Djbo.project=<ProjectName>
to the java options.
Now when you run the page you can still see the sourcing home but when you
click on create RFQ you get the problem.

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{"triggeringElement":"document","triggeringElementType":"DOM_OBJECT","bindType":"bind","bindEventType":"ready",actionList:[{"eventResult":true,"executeOnPageInit":false,"stopExecutionOnError":true,javascriptFunction:function(){
   if (this.browserEvent !== 'load'){
      apex.jQuery(document).apex_modal_page('openPageFromApexThis', this);
},"attribute02":"STATIC","attribute03":"f?p=101:21:3963167387744880::21:::","attribute05":"data-url","attribute06":"div#success-message","attribute07":"AUTO","action":"PLUGIN_COM_SKILLBUILDERS_MODAL_PAGE"},{"eventResult":true,"executeOnPageInit":false,"stopExecutionOnError":true,javascriptFunction:apex.da.cancelEvent,"action":"NATIVE_CANCEL_EVENT"}]}];
</script>
<link rel="stylesheet" href="#PLUGIN_PREFIX#plugins/modal-page/server/TEST.css" type="text/css" />
<script type="text/javascript" src="wwv_flow_file_mgr.get_file?p_plugin_id=34423998056404065675&p_security_group_id=4874907161072557&p_file_name=jquery.colorbox-min.js"></script>
<script type="text/javascript" src="wwv_flow_file_mgr.get_file?p_plugin_id=34423998056404065675&p_security_group_id=4874907161072557&p_file_name=apex_modal_page.min.js"></script>
<script type="text/javascript">

</script></body>
</html>Apex 4.2 on same server etc, after upgrade generates code below :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html lang="nl" xmlns="http://www.w3.org/1999/xhtml" xmlns:htmldb="http://htmldb.oracle.com" xmlns:apex="http://apex.oracle.com">
<head>
<title>sdfsdfsf</title>
<link rel="stylesheet" href="/i/css/apex.min.css?v=4.2.0.00.27" type="text/css" />

<link rel="stylesheet" href="/i/libraries/jquery-ui/1.8.22/themes/base/jquery-ui.min.css" type="text/css" />
<script type="text/javascript">
var apex_img_dir = "/i/", htmldb_Img_Dir = apex_img_dir;
</script>
<script src="/i/libraries/apex/minified/desktop_all.min.js?v=4.2.0.00.27" type="text/javascript"></script>
<script src="/i/libraries/apex/minified/legacy.min.js?v=4.2.0.00.27" type="text/javascript"></script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="/i/themes/theme_2/css/theme_4_0.css" type="text/css" />



</head>
<body >

<form action="wwv_flow.accept" method="post" name="wwv_flow" id="wwvFlowForm" novalidate >
<input type="hidden" name="p_flow_id" value="101" id="pFlowId" /><input type="hidden" name="p_flow_step_id" value="3" id="pFlowStepId" /><input type="hidden" name="p_instance" value="2102738057213" id="pInstance" /><input type="hidden" name="p_page_submission_id" value="6687700944614" id="pPageSubmissionId" /><input type="hidden" name="p_request" value="" id="pRequest" />
<div id="header">
<div id="app-logo"><a href="f?p=101:1:2102738057213"><span style="font-family:Arial; color:green; font-size:18; white-space:nowrap; font-weight:bold;">SoMStudie v1.06 - Productie</span></a></div>
<div id="navbar">
    <div class="navbar-entry"><a href="javascript:{if (confirm('Applicatie uitloggen ? Niet opgeslagen wijzigingen gaan verloren !')) redirect('wwv_flow_custom_auth_std.logout?p_this_flow=101&p_next_flow_page_sess=101:1');}" class="navbar-link">Uitloggen</a></div>
    <div class="app-user">Welcome: ADMIN</div>
</div>
</div>
<div id="tabs">
<div class="frame">
    <div class="bg">
      <div class="tab-holder">
      </div>
    </div>
</div>
</div>
<div id="topbar"></div>
<div id="messages"></div>
<div id="body">
<table class="tbl-body" cellspacing="0" cellpadding="0" border="0" summary="">
    <tbody>
      <tr>
        <td class="tbl-main" width="100%"><div class="rounded-corner-region" id="R9719141085411482" >
<div class="rc-blue-top"><div class="rc-blue-top-r">
    <div class="rc-title">sdfsdf</div>
    <div class="rc-buttons"></div>
</div></div>
<div class="rc-body"><div class="rc-body-r"><div class="rc-content-main"><table id="apex_layout_9719141085411482" border="0" class="formlayout" summary="" role="presentation"><tr><td nowrap="nowrap" align="right"><label for="P3_X" tabindex="999"><a class="optional-w-help" href="javascript:popupFieldHelp('9719940026416952','2102738057213')" tabindex="999">X</a></label></td><td align="left" valign="middle"><input type="hidden" name="p_arg_names" value="9719940026416952" /><input type="text" id="P3_X" name="p_t01" class="text_field" value="" size="30" maxlength="4000" /></td></tr></table></div></div></div>
<div class="rc-bottom"><div class="rc-bottom-r"></div></div>
</div></td>
        <td class="tbl-sidebar"></td>
      </tr>
    </tbody>
</table>
</div><div id="footer"><div class="content">
<div id="customize"></div>
</div></div>
<input type="hidden" name="p_md5_checksum" value="" /><input type="hidden" name="p_page_checksum" value="E08AB8A6D69B3450572EC2E89A528B29" id="pPageChecksum" /></form>
<script type="text/javascript">
apex.da.initDaEventList = function(){
apex.da.gEventList = [
{"bindEventType":"ready",actionList:[{"eventResult":true,"executeOnPageInit":false,"stopExecutionOnError":true,javascriptFunction:function(){
   if (this.browserEvent !== 'load'){
      apex.jQuery(document).apex_modal_page('openPageFromApexThis', this);
},"attribute02":"STATIC","attribute03":"f?p=101:21:2102738057213::21:::","attribute05":"data-url","attribute06":"div#success-message","attribute07":"AUTO","action":"PLUGIN_COM_SKILLBUILDERS_MODAL_PAGE"},{"eventResult":true,"executeOnPageInit":false,"stopExecutionOnError":true,javascriptFunction:apex.da.cancelEvent,"action":"NATIVE_CANCEL_EVENT"}]}];
</script>
<link rel="stylesheet" href="#PLUGIN_PREFIX#plugins/modal-page/server/TEST.css" type="text/css" />
<script type="text/javascript" src="wwv_flow_file_mgr.get_file?p_plugin_id=34423998056404065675&p_security_group_id=4874907161072557&p_file_name=jquery.colorbox-min.js"></script>
<script type="text/javascript" src="wwv_flow_file_mgr.get_file?p_plugin_id=34423998056404065675&p_security_group_id=4874907161072557&p_file_name=apex_modal_page.min.js"></script>
<script type="text/javascript">
apex.jQuery( document ).ready( function() {
(function(){apex.jQuery(document).apex_modal_page({
   "transition":"none",
   "draggable":true,
   "initialHeight":100,
   "initialWidth":300,
   "overlayOpacity":.5,
   "scrolling":true,
   "loadingImageSrc":""
(function(){apex.da.initDaEventList();})();
(function(){apex.da.init();})();
});</script>
</body>
</html>Any suggestions why this plugin does not load on page load in 4.2 would be great ( a fix would be even better :) ).
Regards

Firing a method of backing bean on Page Load

Hi all,
Can anyone tell me how a method of the backing bean can be fired when the corresponding jsf page loads in the browser...
in fact some data is to be fetched from the server at the time of page load and rendered in one of the fields ... kindly help me in this regard ...
thanks in advance,
Neeraj Upreti

You can use a constructor or initialization block of the bean for this or maybe even introduce lazy loading in the getters, all depending on the expensiveness of the actual logic.
If you're using JSF 1.2, you can also use the beforePhase attribute of the <f:view> to specify a method which is to be fired on beforePhase of the view. You can also add @PostConstruct annotations to the methods which are to be fired on construction of the bean.

CLASSCASTEXCEPTION on page load

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