Problem with Drop down by key

Hi all,
I Inserted several drop down by key in my view at design time. When I try to run the application it displays an error as
java.lang.ClassCastException at com.sap.tc.webdynpro.progmodel.context.Paths.getAttributeInfoFor(Paths.java:202)
My requirement is,
I am getting a table with two fields(key,value) from R/3 I want to display these in the drop down by key box how to bind them to this drop down.

Hi Refer the below link
DropdownList box to display R/3 table
Re: DropdownList box to display R/3 table
see this link for when to use DropDownByIndex (DDI) vs DDK (DropDownByKey) and how populate data from R/3.
Re: webdynpro populating dropdown values programmatically
populating dropdownbyvalue with the r/3 value?
Re: Regarding DropDown Box
/message/2187817#2187817 [original link is broken]
Re: DropdownList box to display R/3 table
create context value attribute and bind to drop down by key
not getting value from DropDownByKey
Dropdown by key
dynamic DropDownByKey
http://help.sap.com/saphelp_nw04/helpdata/en/4a/8613e41629344194e4f40393740d51/content.htm
For DropdownbyKey
http://help.sap.com/saphelp_nw04/helpdata/en/08/13dbfb6e779743bb2ca641ebcb3411/content.htm
For DropdownByIndex
http://help.sap.com/saphelp_nw04/helpdata/en/24/25e08d4ba6c743b55f1d375637ba8d/frameset.htm
Regards,
Saraswathi
Pls reward points for useful info.

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Edited by: kranthi kumar on May 5, 2011 3:58 PM

Hi Kranthi,
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Hi,
Explaining my problem with an example.
There is a hotel table where user enter hotel details
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