Background callable object :Error

Hi,
I created one background callable object in webdynpro,
to be called from GP design time.
I have done this using the tutorial :
"Implementing Background callable object"
Deployement finished successfully.
But from GP design time, while creating callable object
of type backround execution, I selected,
container type : library
container : apibckg(deployed DC of type J2ee server
library)
implementation class name : the java class which implemented background callable object.
But error in gp: is
"Cannot find this class name"
In webdynpro after building the project I got the warnings:
Nov 3, 2006 11:57:13 AM /userOut/Development Component (com.sap.ide.eclipse.component.provider.listener.DevConfListener) [Thread[ModalContext,5,main]] WARNING: apibckg: built with warnings sap.com/apibckg(MyComponents) in variant "default" (1.406 sec)
can any bdy help me
thanks
smitha

Hi Smitha,
You just need to repeat the steps described in the tutorial, i.e. define the references and create a class that implements the GP Background callable object interface.
Don't forget to define the sub-type of the library in the .dcdef file.
     <component-type>
          <vendor>Your vendor</vendor>
          <type>Java</type>
          <sub-type>Library</sub-type>
     </component-type>
Then add a new empty file named "build.vm" under the folder "cfg". Add the line "#BuildSecondaryLibrary()".
Then build and deploy. It should be there.
Regards,
David

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I have implemented a Background callable object and deployed it to the server.
When I try to make a Callable object of this from the Design Time tab in GP, i get the following error msg.
*Class does not correctly implement the required interface*
The detailed error msg is as follows
Full Message Text
Unable to load the required classes. Check all the references to other modules, especially the GP API
com.sap.caf.eu.gp.base.exception.EngineException: Unable to load the required classes. Check all the references to other modules, especially the GP API
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at com.sap.caf.eu.gp.ui.co.config.bkgd.COCfgSelect.OnCanLeaveScreen(COCfgSelect.java:293)
Pls help.
Tx in advance

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I am facing "cannot find this class" while creating Background Callable Object.
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[Creating Callable Objects for Background Execution|http://help.sap.com/saphelp_nwce10/helpdata/en/53/cde385301f4aa3b8e77a92cd46bff3/frameset.htm]
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Edited by: Sathish Kumar SV on Apr 4, 2009 10:34 AM

Hi, kavita.
First, make sure you choosed the correct container when you created the background CO.
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Hi All ,
I am following this tutorial link for creating background callable object
http://help.sap.com/saphelp_nwce10/helpdata/en/9a/e8934258a5ca6ae10000000a155106/frameset.htm
I have created java and enterprise application DC and deployed successfully. But while creating CO in design time when i am selecting application and entering class as com.examples.bckgco.UserDetailsCallableObject for Implementation Class Name , and on click next i m getting exception as "can not find this class name". package and class name are correct still getting this excetpion message. Plz help me to resolve this solution.
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Hi Jorgen,
This behavior is completely normal. It can seem awkward but what you described is somehow logical.
Let's say you have three actions, the second one is the email notification. When completing the first action, the second action is triggered. As it is a background callable object, it is put into the queue and wait for processing. As the refresh of the screen is faster than the processing of the callable object, the next action (the third) is not yet active/ready to be processed.
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following the sublink:
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With reference to thread:
Interactive form as Callable object error on testing the object.
FYI, I'm running NW04s, EP 7.0 SPS 13, JDK 1.4.2_14, Unix OS
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Message was edited by:
Sunil Vishnubhotla

Hi,
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