NullPointerException and cannot be cast when extended CO!

Hello!
Forms develop in to Brazil and I am now entering the area of customization in Oa Framework, forgive my English strange ...
I have the need to extend the controller ExpSearchCO to include a new filter field search. Just extending ExpSearchCO and without any additional logic error occurs in the super class !!!!
oracle.apps.fnd.framework.OAException: java.lang.NullPointerException return the inside super class
the line of code is the line informed :oaquerybean.setSimpleSearchInstructionTexts(null);
trying to deal with this error message appeared
oracle.apps.fnd.framework.OAException: java.lang.ClassCastException: oracle.apps.fnd.framework.webui.beans.layout.OAQueryBean cannot be cast to oracle.apps.fnd.framework.webui.beans.layout.OAPageLayoutBean at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:891)
the snippet is:
OAFormattedTextBean oaformattedtextbean = (OAFormattedTextBean)oawebbean.findIndexedChildRecursive("SearchInstruction");
((OAPageLayoutBean)oawebbean).prepareForRendering(oapagecontext);
oaformattedtextbean.setText(oapagecontext.getMessage("ICX", s2, null));
there is some initialization that should be within my custom control or dealings that errors do not occur in the super class?
================================================================================
first error :
oracle.apps.fnd.framework.OAException: java.lang.NullPointerException at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:891) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:603) at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:247) at oracle.apps.fnd.framework.webui.OAQueryHelper.processRequest(OAQueryHelper.java:673) at oracle.apps.fnd.framework.webui.beans.layout.OAStackLayoutBean.processRequest(OAStackLayoutBean.java:350) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:959) at
## java.lang.NullPointerException at oracle.apps.icx.por.reqmgmt.webui.ExpSearchCO.processRequest(ExpSearchCO.java:56) at xmtd.oracle.apps.icx.por.reqmgmt.webui.XxExpSearchCO.processRequest(XxExpSearchCO.java:54) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:587) at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:247) at oracle.apps.fnd.framework.webui.OAQueryHelper.processRequest(OAQueryHelper.java:673) at oracle.apps.fnd.framework.webui.beans.layout.OAStackLayoutBean.processRequest(OAStackLayoutBean.java:350) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:959) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:926) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:646) at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:247) at
=====================================================================================
second error
oracle.apps.fnd.framework.OAException: java.lang.ClassCastException: oracle.apps.fnd.framework.webui.beans.layout.OAQueryBean cannot be cast to oracle.apps.fnd.framework.webui.beans.layout.OAPageLayoutBean at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:891) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:603) at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:247) at ...
## java.lang.ClassCastException: oracle.apps.fnd.framework.webui.beans.layout.OAQueryBean cannot be cast to oracle.apps.fnd.framework.webui.beans.layout.OAPageLayoutBean at oracle.apps.icx.por.reqmgmt.webui.ExpSearchCO.processRequest(ExpSearchCO.java:79) at xmtd.oracle.apps.icx.por.reqmgmt.webui.XxExpSearchCO.processRequest(XxExpSearchCO.java:54) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:587) at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:247) at oracle.apps.fnd.framework.webui.OAQueryHelper.processRequest(OAQueryHelper.java:673) at
for details of the problem, link with Attach: http://www.4shared.com/file/132642195/f3340a3e/anexo.html
Edited by: user2019065 on 14/09/2009 14:17

The question is as follows:
Within the page oracle /apps/icx/by/reqmgmt/webui/ExpSearchPG 115.27 in iproc.
Is necessary to include a new filter for search.
Analyzing the source code finds the need to extend the View Object AllReqsVO to include this new field.
was necessary to extend the classes
oracle.apps.icx.por.reqmgmt.webui.ExpSearchCO
oracle.apps.icx.por.reqmgmt.ExpSearchCriteria
oracle.apps.icx.por.reqmgmt.server.ExpSrchSvrCmd
that perform the logic to filter the information.
However, just extending the class oracle.apps.icx.por.reqmgmt.webui.ExpSearchCO , Not changed anything yet in this class ok !
The application presents the errors mentioned above during the tests.
the question is whether there is any procedure to follow when extending a control?
ake two weeks since my first contact with OA Framework and Java ...
think it is you are doing wrong, because it is a simple test. you have any tips or documentation about extending controls
Edited by: EdgarOliveira on 15/09/2009 10:12

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NullPointerException and cannot be cast when extended CO!

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