Creating Lov based on dynamic viewobject

Hi,
I'm trying to create a lov page that is based on a viewobject whose query (and bindings) are set at runtime (like Steve Muench shows in one of his undocumented ADF samples).
In the prepareModel() I do the following:
-unbindRowsetIteratorFromDynamicQueryIteratorBinding(...)
-changeDynamicViewObjectQuery(...)
-recreateRangeBindingForDynamicQuery(...)
-removeControlBinding(...)
-addDynamicRangeBinding(...)
So I remove the existing binding, change the query of the viewobejct and recreate the bindings.
I have got most of the code running except for 2 issues:
1. The first time I call my Lov I get the a stacktrace (included at the end of this post). If I close the window and click the Lov button again it is working fine.
2. After I have selected a value in my Lov the value is set in my calling screen. If I commit the new value is commited to the database, but the value in the screen is set back to the original value! If I then refresh the iterator by clicking a tableheader the correct values are shown.
I do not know if these two issues are related but if someone could give me a hint in which direction I have to look for a solution for one of the problems, I would be very glad.
I'm using JHeadstart 10.1.2.2 (32) and generating JSP's.
Here is the stacktrace I am getting:
javax.servlet.jsp.JspException: An error occurred while evaluating custom action attribute "value" with value "${bindings.OpmerkingenLookupIterator.rangeStart}": An error occurred while getting property "rangeStart" from an instance of class oracle.jbo.uicli.binding.JUIteratorBinding (java.lang.NullPointerException)
     at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:146)
     at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:166)
     at org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.evaluate(ExpressionEvaluatorManager.java:112)
     at org.apache.taglibs.standard.tag.el.core.ExpressionUtil.evalNotNull(ExpressionUtil.java:85)
     at org.apache.taglibs.standard.tag.el.core.SetTag.evaluateExpressions(SetTag.java:147)
     at org.apache.taglibs.standard.tag.el.core.SetTag.doStartTag(SetTag.java:95)
     at web2d_inf._page._referentie._LovOpmerkingenLookup._jspService(_LovOpmerkingenLookup.java:131)
     [SRC:/WEB-INF/page/referentie/LovOpmerkingenLookup.jsp:28]
     at com.orionserver[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
     at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:349)
     at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)
     at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:765)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:317)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:220)
     at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
     at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
     at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
     at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:320)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
     at oracle.jheadstart.controller.strutsadf.JhsRequestProcessor.process(JhsRequestProcessor.java:385)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     at oracle.jheadstart.controller.strutsadf.JhsActionServlet.process(JhsActionServlet.java:130)
     at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
     at oracle.jheadstart.controller.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:176)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:16)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:239)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:600)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:317)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:790)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.HttpRequestHandler.run(HttpRequestHandler.java:270)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
     at java.lang.Thread.run(Thread.java:534)

Pascal,
This sounds like a JDeveloper/ADF issue that is not related to JHeadstart. To simplify the test case, you could create a simple drag-and-drop ADF application without JHeadstart and see if the same problem occurs there. Can you please log a TAR at MetaLink ( http://metalink.oracle.com/ ), or ask this question at the JDeveloper forum at http://otn.oracle.com/discussionforums/jdev.html ?
Thanks.
Sandra Muller
JHeadstart Team
Oracle Consulting

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      read table lv_desc-names index <typeinfo>-idx_edit_mask
        assigning <nameinfo>.
      ls_alv_fieldcat-edit_mask           = <nameinfo>-name.
      if not <nameinfo>-continue is initial.
        add 1 to <typeinfo>-idx_edit_mask.
        read table lv_desc-names index <typeinfo>-idx_edit_mask
          assigning <nameinfo>.
        concatenate
          ls_alv_fieldcat-edit_mask
          <nameinfo>-name
          into ls_alv_fieldcat-edit_mask.
      endif." not <nameinfo>-continue IS INITIAL.
    endif." not <typeinfo>-IDX_EDIT_MASK is initial.
* assign length, output length and decimals
    ls_alv_fieldcat-intlen                = <typeinfo>-length.
    ls_alv_fieldcat-outputlen             = <typeinfo>-output_length.
    ls_alv_fieldcat-decimals_out          = <typeinfo>-decimals.
    ls_alv_fieldcat-inttype               = <typeinfo>-type.
    append ls_alv_fieldcat to pt_alv_fieldcat.
    clear: "prevent anything 2 B taken for subsequent fields
      ls_alv_fieldcat.
endloop." at lv_desc-types where not IDX_NAME is in initial.
endform.                    " ALV_FIELDCAT_FOR_ITAB
*&      Form get_rollname_4_tabfield
*       Get Data                          type for Table field
form get_rollname_4_tabfield
using    p_fname                        type text80 ""CRM<=R/3 fname
changing p_alv_fieldcat                 type slis_fieldcat_alv.
field-symbols:
    <dfies>                               type dfies.
data:
    lv_tabname                            type tabname,
     lt_dfies                             type table of dfies,
    lv_fieldname                          type fieldname.
split p_fname at '-'
    into lv_tabname lv_fieldname.
clear p_alv_fieldcat-rollname.
call function 'DDIF_FIELDINFO_GET'
    exporting
      tabname                             = lv_tabname
      fieldname                           = lv_fieldname
*   LANGU                                 = SY-LANGU
*   LFIELDNAME                            = ' '
*   ALL_TYPES                             = ' '
* IMPORTING
*   X030L_WA                              =
*   DDOBJTYPE                             =
*   DFIES_WA                              =
*   LINES_DESCR                           =
   tables
     dfies_tab                            = lt_dfies
*   FIXED_VALUES                          =
   exceptions
     not_found                            = 1
     internal_error                       = 2
     others                               = 3
if sy-subrc                             <> 0.
    message id sy-msgid                   type sy-msgty number sy-msgno
            with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
else.
    read table   lt_dfies assigning <dfies> index 1.
    p_alv_fieldcat-rollname               = <dfies>-rollname.
* Und wenn keinerlei Twexte gepflegt sind?
    if <dfies>-reptext is initial and
       <dfies>-scrtext_s is initial and
       <dfies>-scrtext_m is initial and
       <dfies>-scrtext_l is initial.
* No Text: Use Fieldname as text
      p_alv_fieldcat-seltext_s            =
      p_alv_fieldcat-seltext_m            =
      p_alv_fieldcat-seltext_l            =
      p_alv_fieldcat-reptext_ddic         =
      p_alv_fieldcat-fieldname.
    endif." <dfies>-reptext IS INITIAL AND
endif.
endform.                    " get_rollname_4_tabfield
Regards,
Clemens

Steps to create LOV dynamically

Hello All,
I want to create LOV dynamically.in my Oracle Forms 6I
Is there any code which can create LOV dynamically using coding.
I can create Record group dynamically. but I want to create LOV dynamically not from object browser of Form Builder by pressing Add LOV option.
Kindly help me.
Thanks
HARSH SHAH

Forms does not have a Built-in for dynamically creating an LOV; these objects can only be created in the Forms Builder during design time. You can, as numerous people have tried to demonstrate, change the Record Group an LOV uses dynamically. Unless you are changing the Column Mapping Properties of the LOV, using different Record Groups to supply the data for an LOV should work for you. If you need to change the Column Mapping Properties, then you will need to create multiple LOV objects with the different mapping you need and then assign the LOV to your Item dynamically.
Hope this helps,
Craig...

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