Webdynpro model context mapping issue

Hi,
I have created a faceless Web Dynpro model component (DC1) and an UI Component (DC2).
DC1 is an used component in DC2.
After mapping the model node from the interface controller of DC1 to DC2 it says "Referenced model class is missing".
I asume, I should add the model as used model to DC2 as well.
But when I proceed this way I am wondering why you should create a seperate model Web Dynpro DC? Where are the Pros?
Can anybody tell my how to proceed with this issue?
Are there any best practices how to use a central model DC in Webdynpro and access the data via interface mapping from other DCs?
Thanks ahead

Hi Bernd,
For reusability, model component and functional components are seperated. In model component, all the model created which are used for all func components. and In Func component usage model component based on the requirement to use number of model that web dynpro componetization
>But when I proceed this way I am wondering why you should create a seperate model Web Dynpro DC? Where are the Pros?
Can anybody tell my how to proceed with this issue?
For seperation of business logic model component from visual component.
Componentization, resualbilty, easy to maintain etc
Are there any best practices how to use a central model DC in Webdynpro and access the data via interface mapping from other DCs?
Please refer to [Here |http://www.williamcui.com/blog/resources/principles_patterns_and_practices_in_web_dynpro_for_java.swf] and go through [Articles|http://www.sdn.sap.com/irj/scn/articles-webdynpro-all?startindex=161] and [Blogs|http://www.sdn.sap.com/irj/scn/weblogs?blog=/weblogs/topic/43] and [Wikkies|http://wiki.sdn.sap.com/wiki/display/WDJava/WelcometoWebDynproJava%21]
Hope it helps
Regards
Arun

Similar Messages

External context mapping issue: cannot create nodes,no mapping defined yet

Hello everybody,
I'm trying to use the external context mapping as it is explained in http://help.sap.com/saphelp_nw04/helpdata/en/d7/e551cf896c3a49bb87bb4ce38c99c8/frameset.htm
I did it in the past without any problem, but now, when i try to create a new node, i get the error "cannot create nodes,no mapping defined yet." This error appears as i try to create an element of the node (in the Internal Component), this way:
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     elto.setPrueba("Esto es una prueba");
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The mapping is correctly done in the "Embedder Component", and the attribute "isInputElement"=true in the Interface Controller of the "Internal Component".
Any idea, any clue?
Thank you very much in advance
Isidro López

Frankly speaking: I just read again, but very carefully, all the steps explained at
http://help.sap.com/saphelp_nw04/helpdata/en/d7/e551cf896c3a49bb87bb4ce38c99c8/frameset.htm.
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Enterprise JavaBean Model context mapping problem with dates from CAF BO

Hi Experts,
using CAF BO inside WD Java is a little bit problematic!
The CAF core Datatype "Date" is exposed as "javax.xml.datatype.XMLGregorianCalendar".
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in this case, a java.sql.date is needed.
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Hi Roelof,
CAF automatically decides which datatypes are used. It is not possible to change the used datatype
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Mapping issue with context again

I again need help with a mapping issue. I dont know how to handle the contexts to get this working in the xi graphical mapping tool. I have previously logged a question regarding this structure but the requirements have now changed.
I have a source document that has multiple delivery line items and for each delivery line item, there are multiple handling units. Each handling unit contains the line number of the delivery line item it belongs to. This structure has been simplified below.
Source Sample
<DOCUMENT>
<DELIVERY_LINEITEM>
<LINENUMBER>10</LINENUMBER>
<MATERIAL>mat 1</MATERIAL>
</DELIVERY_LINEITEM >
<DELIVERY_LINEITEM >
<LINENUMBER>20</LINENUMBER>
<MATERIAL>mat 2</MATERIAL>
</DELIVERY_LINEITEM >
<HANDLING_UNITS>
<HU_LABEL>123</HU_LABEL>
<HU_ITEM>
<LINENUMBER>10</LINENUMBER>
</HU_ITEM>
</HANDLING_UNITS>
<HANDLING_UNITS>
<HU_LABEL>456</HU_LABEL>
<HU_ITEM>
<LINENUMBER>10</LINENUMBER>
</HU_ITEM>
</HANDLING_UNITS>
<HANDLING_UNITS>
<HU_LABEL>789</HU_LABEL>
<HU_ITEM>
<LINENUMBER>20</LINENUMBER>
</HU_ITEM>
</HANDLING_UNITS>
</DOCUMENT>
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DOCUMENT 1..1
DELIVERY_LINEITEM 1..unbounded
LINENUMBER 1..1
MATERIAL 1..1
HANDLING_UNITS 1..unbounded
HU_LABEL 1..1
HU_ITEM 1..1
LINENUMBER 1..1
In the target structure, I need to output each handling unit along with the corresponding DELIVERY_LINEITEM material. Target structure has been simplified below:
Target Sample
<DOCUMENT>
<ROW>
<PACKAGING>
<HU_LABEL>123</HU_LABEL>
</PACKAGING>
<PACKAGING_ITEM>
<LINENUMBER>10</LINENUMBER>
<MATERIAL>mat 1</MATERIAL>
</PACKAGING_ITEM>
</ROW>
<ROW>
<PACKAGING>
<HU_LABEL>456</HU_LABEL>
</PACKAGING>
<PACKAGING_ITEM>
<LINENUMBER>10</LINENUMBER>
<MATERIAL>mat 1</MATERIAL>
</PACKAGING_ITEM>
</ROW>
<ROW>
<PACKAGING>
<HU_LABEL>789</HU_LABEL>
</PACKAGING>
<PACKAGING_ITEM>
<LINENUMBER>20</LINENUMBER>
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</PACKAGING_ITEM>
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</DOCUMENT>
Target Structure
DOCUMENT 1..1
ROW 1..unbounded
PACKAGING 1...1
HU_LABEL 1..1
PACKAGING_ITEM 1..1
LINENUMBER 1..1
MATERIAL 1..1
Note, 1 ROW in the target structure = 1 HANDLING_UNITS from the source structure.
Can anyone help me to achieve this? I do not know how to map the relevant DELIVERY_LINEITEM\MATERIAL from the source structure to the target structure.

JM,
Please find the solution. Reply back if it helps or not
http://www.flickr.com/photo_zoom.gne?id=1045178998&size=o
http://www.flickr.com/photo_zoom.gne?id=1045179010&size=o
http://www.flickr.com/photo_zoom.gne?id=1045179022&size=o
Results :http://www.flickr.com/photo_zoom.gne?id=1045179134&size=o
Code used:
for(int j=0;j<Handling_Linenum.length;j++)
for(int k=0;k<Delivery_Linenum.length;k++)
if(Handling_Linenum[j].equals(Delivery_Linenum[k]))
result.addValue(""Material[k]"");
result.addContextChange();
Best regards,
raj.

Context with counter mapping issue

I need help with a mapping issue.
I have a source document that has multiple line items which in turn contains multiple item texts. This structure has been simplified below.
Source Sample
<DOCUMENT>
---<LINEITEM>
<ITEMFIELD>itemfield</ITEMFIELD>
<ITEMTEXTS>
<TEXT>text 1</TEXT>
</ITEMTEXTS>
<ITEMTEXTS>
<TEXT>text 2</TEXT>
</ITEMTEXTS>
---</LINEITEM>
</DOCUMENT>
Source Structure
DOCUMENT 1..1
LINEITEM 0..unbounded
ITEMFIELD 0..1
ITEMTEXTS 0..unbounded
In the target structure, I need to output each line item with a counter to represent the line item number. Also, I need to output each item text with the line item number it corresponds to:
Target Sample
<DOCUMENT>
---<LINEITEM>
<ITEMNUMBER>1</ITEMNUMBER>
<ITEMFIELD>itemfield</ITEMFIELD>
---</LINEITEM>
---<ITEMTEXTS>
<ITEMNUMBER>1</ITEMNUMBER>
<TEXT>text 1</TEXT>
---</ITEMTEXTS>
---<ITEMTEXTS>
<ITEMNUMBER>1</ITEMNUMBER>
<TEXT>text 2</TEXT>
---</ITEMTEXTS>
</DOCUMENT>
Target Structure
DOCUMENT 1..1
LINEITEM 0..unbounded
ITEMNUMBER 1...1
ITEMFIELD 0..1
ITEMTEXTS 0..unbounded
ITEMNUMBER 1..1
TEXT 1..1
I do not know how to match the ITEMNUMBER in the ITEMTEXTS target structure with the corresponding LINEITEM target structure. Can anyone help me with this?
Regards,
JM

James,
I've tried both 1.2 release and 2.0 (v20091121-r5847) but received the same result - empty Map.
Moreover, for both versions the following string was absent in deployed XML file:
+<direct-key-field table="PARAM_SESS" name="PARAM_NAME" xsi:type="column"/>+
Therefore, on application initialization I have got an exception: org.eclipse.persistence.exceptions.DescriptorException with message This descriptor contains a mapping with a DirectMapMapping and no key field set.
So I was forced to add the line manually.
This seems buggy to me...
Regards,
Alexey

Problem with context mapping and data flow in a FPM application

Hi All,
I am trying to develop an ESS application using FPM. For the same, the requirement is to see the history of an employee in the second view.
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As per the FPM guidelines, the Model is residing in the Fc component and the respective Vc components are using the model data accordingly.
I am executing the model in the Fc component calling the executable method in the interfaceController of the first view and then trying to display the output data of the BAPI in the first view which provides the overview information.This is working fine.
But when i am trying to map the same output node to the Table UI for the second view, the record size is coming zero and thus no information is available.
For the above issue, I am again executing the RFC in the InterfaceController of the second view to populate the records, which is incorrect as it is already executed and the data is available for the first view.
I request you to let me know the correct approach to Context mapping and data flow when using FPM-roadmap. Is their any standard method or approach available to deal with such requirements? Please let me know.
Thanks in advance.
Regards
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Hi Idhaya,
I model node is available in Fc and the Fc interface controller is being used in the first Vc and the second Vc.
So the idea is, as the executable method is generated in the Fc, so i have created a custom method to call the executable method in Fc, where the input parameter is getting passed and this custom method is finally getting called is the first Vc.
So , now my first Vc is ready to call the custom method in Fc and execute the RFC. Once the RFC is executed, the nodes in the Fc should get populated which is the ideal case.
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DK

Com.sap.tc.webdynpro.progmodel.context.ContextException

Hi Everybody,
I am getting the below mentioned error, while deploying the application. I am trying to get some values from backend to display it in a dropdownKey. So I am giving an GroupID and UserID in my wdDoinit().
com.sap.tc.webdynpro.progmodel.context.ContextException: DataNodeInfo(AuditRepCompView <VIEW NAME>): cannot modify Groupid <MODEL ATTRIBUTE> because it is mapped and there is no active NodeElement to take the value
Regards/Guru

hi jhansi,
I didn't use any model attribute. i just create 2 attribute from the context. after tat, i mapped those two attributes to the relevant context element.
But after i rebuilt & deploy my application, it show this error: com.sap.tc.webdynpro.progmodel.context.ContextException: DataNodeInfo(StartView): cannot modify pwd because it is mapped and there is no active NodeElement to take the value
Can u pls tell me wad this error means?
Thanks & Rgds,
Angie

Exception:com.sap.tc.webdynpro.progmodel.context.ContextException: NodeElem

Hi Experts,
I am consuming RFC to my webdynpro java application. The rfc takes some input values and returns some output vaules.
In the application I had taken model to my component and mapped ( model --> component --> view ). i created Application and deployed it. it is giving the following Exception.
com.sap.tc.webdynpro.progmodel.context.ContextException: NodeElement(.ComponentOne.Zbapi_Material_Create_Input): model node element cannot be created without a model instance
 at com.sap.tc.webdynpro.progmodel.context.ModelNodeElement.<init>(ModelNodeElement.java:63)
 at com.sap.demo.sample.wd.comp.componentone.wdp.IPublicComponentOne$IZbapi_Material_Create_InputElement.<init>(IPublicComponentOne.java:357)
 at com.sap.demo.sample.wd.comp.componentone.wdp.IPublicComponentOne$IContextNode.doCreateElement(IPublicComponentOne.java:55)
 at com.sap.tc.webdynpro.progmodel.context.NodeInfo.createElement(NodeInfo.java:1269)
Here actually it had to display the input screen (default view page )but while loading the starting page it gives the above exception.
I searches lot of forums, but they are related to particular inputfields, but here it is not that scenario, i am not using any fields here just to display the view page. I don't know exactly what was the mistake, Help me please if you know.
Regards,
Pradeep Kumar

Hi Pradeep,
Did you checked that all the requierd code has been genarated or not in component controller?
If you use apply template--> servicee controller some times service controller will not genarate the requierd code.
check in the wdDoInit() method whether the following code has been genarated or not.
if not wirte tht code.
 //$$begin Service Controller(17224717)
 WSTest model = new WSTest();
 wdContext.nodeRequest_EmployeeDeatilsByType().bind(new Request_EmployeeDeatilsByType(model));
 //$$end
Revert back if you have any quaries.
Thanks & Regards,
Bhargava.

Context Mapping: child-nodes of non-mapped parent nodes

I am somewhat curious about Context Mapping in WebDynpro.
Which parents nodes need to be mapped in order to map child nodes ? Does a child node has more than one parent node (e.g. grandparent - two steps above) ?
A.1 -
MAPPED----
>    B.1
- A1.1   NOT MAPPED
- A1.2   NOT MAPPED
        - A.1.2.1     MAPPED TO>    B.1.2.4
        - A.1.2.2   NOT MAPPED
- A1.3   NOT MAPPED
Is it sufficient that only one of these parent nodes (e.g. direct parent node not mapped, but parent node of this parent node is mapped) need to be mapped so that the child node can be mapped ?
Is this assumption true or not ?
The SAP library states:
"Conversely, child nodes of non-mapped parent nodes cannot be mapped, otherwise this would result in irresolvable conflicts at runtime with respect to the parent-child relation in the context and the mapping relation." (http://help.sap.com/saphelp_nw04/helpdata/de/51/a3384162316532e10000000a1550b0/content.htm)
This statement is not absolutely clear on this issue.

Let me put it this way
You have a node vehicle and you have a child node for that the car. The car node have parameters car1, car2.
Let the vehicle node have parameters veh1 and veh2
Then if you map vehicle node one to any other node (say in the comp. controller) you have the option of mapping its children i.e veh1,veh2 and carnode.
You can have that veh1 is mapped and veh2 is not mapped.
vehicle node(mapped)
veh1(may or may not be mapped)
veh2(may or may not be mapped)
car node(may or may not be mapped)
If instead you try to map only the car node the vehicle node will also get mapped automatically but not it's child parameters like veh1 and veh2.
vehicle node(mapped)
veh1(may or may not be mapped)
veh2(may or may not be mapped)
car nodemapped)
car1(may or may not be mapped)
car2(may or may not be mapped)
Hope this would help.
Do revert for further clarification
Regards
Noufal

New Business Method in EJB not available in Webdynpro Model

Hi,
I am using EJBs for Business Logic in my webdynpro java application. I have added a new Business Method in one of the session bean. But I am not able to see the new method in webdynpro model. I am following the below procedure -
1. Select the Session bean.
2. Add New Business Method. It automatically adds the method in Remote and Local Interface.
3. Implement thie new method.
4. Build EJB project
5. Add it to EAR
6. Build EAR Project
7. Deploy EAR Project
After following above steps, when I am trying to create a model in my webdynpro project, it does not reflect the changes (context returned by new business method).
Can any one help me on this ?
Thanks in advance,
Gaurav

The issue is resolved. This is the case where methods in beans returns collections. For such scenario, relations have to be created manually, it does not come automatically. For details refer the blog at below link --
/people/balaramnaidu.bankuru/blog/2006/04/23/importing-complex-javabean-model-into-webdynpro-by-creating-relationships-for-the-model-classes
Thanks everyone.
Gaurav

External Context Mapping & Normal Mapping in same IF Controller?

I have a Parent DC that embeds a Child DC.
The Parent uses data from the Child DC obtained through the Child's Interface Controller, which works fine.
But there is also some data (value node) that I need to pass to the Child DC through the Interface Controller as External Context Mapping, from the Parent DC.
I know how to make these work separately but am not sure how to make both Ext. Mapping and Normal mapping in the same Interface Controller (the parent IF controller) and am not sure if it is even possible.
Is it possible to both pass data (external context mapping) and get data (normal mapping) from the same Interface Controller?
I guess I am a little confused in how the arrows should point in the Data Modeler and how to approach this.
Really appreciate your help,
SK

Thanks Satya, Vishal
My issue is not about navigation but how to transfer data back and forth to the same embedded child component. Here's some clarification.
1. Parent has declared Usage of Child
2. Child is available in Data Modeler
3. Child has data coming from its Interface Controller, which is mapped to the Parent's Comp Controller, which is working fine.
4. Now there is a different node that exists in both Parent and Child.
5. The data origin for this node is the Parent and so the Child needs to get it from the Parent using External Context Mapping to its Interface Controller so that it is available inside the Child.
My question is, is this data transfer scenario possible? If yes, what steps should be taken to make this happen?
Thanks again,
SK

Context Exception for context mapping between 2 components

Hi Guys,
Currently I am working on ess FPM applications,
I have 2 componets, VcComp1 & FcComp2, the data entered on the VcComp1 view should be passed to FcComp2.
I defined context attribute in FcComp2 Interface controller, and then I mapped it to the context value attribute of VcCompl1's view controller, then bind the input field with that context value attribute.
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Please help , I have been stuck for 2 days on this small issue.
Thanks with high rewarding points!
Regards,
Guo Feng

hi,
If you are trying to access the values in SVS or EVS and passing it to the Comp controller this errror will occur.
Create a context attr and copy that vaue into it and bind it to the comp value attr.
If not chk out the following link,
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/60132577-7801-2b10-c9b1-b13b2f78f23b
Regards
Jayapriya

Java.lang.NoSuchMethodError: com.sap.tc.webdynpro.model.webservice.gci.WSTy

Hello,
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public void wdDoInit()
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Any ideas?
Regards
MG

The problem is that the logical destinations are not well configured.

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After upgraded MII Patch from 12.2 SP2 to SP3. Facing issue on system properties -
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Hi Ashish and Sumit,
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Mapping issue in idoc to JDBC scenario

mapping issue in idoc to JDBC scenario
source structure
E1KNB1M
BUKRS = 1000
E1KNB1M
BUKRS= 9000
E1KNB1M
BUKRS= 2000
THE NODE E1KNB1M is repeated many times and the field BUKRS is also repeated with E1KNB1M as above
TARGET field : ISFRANCHISE
if any where value of BUKRS =9000 we have to pass Y to the target filed, else N
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I've done the mapping as below
BUKRS = 9000--> IF THEN Y ELSE N--
> ISFRANCHISE
BUT everry time the target value is N only
pl suggest
rgds
mojib

mapped like this
BUKRS--->SORT---->
                                             EQUALS --------IF---THEN    Y
9000------------------------>                                               ----------------->ISFRANCHISE
                                                              ELSE   N
context of BUKRS set to parent node
its worked
thanks to all for valuable suggestions
rgds
mojib

Webdynpro model context mapping issue

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