Interview Question on Web Dynpro JAVA

hi
Could any body please send Interview Questons on Web Dynpro java.
Mukesh

Hi Mukesh
I dont think u will get any specific material for interview questions on webdynpro ,
but u can always follow this link which has each n every aspect of webdynpro listed here for interview u should be familure with all the titbits of webdynpro and depending on ur comfort level u can explore any specific topic which u find dificult
and moreover none can tell which questions ur going to be asked on the day
Important is read about those things which u implemented in ur projects coz ur interview is going to circled around what u have done and U r confidence level thats the trik
https://www.sdn.sap.com/irj/sdn/webdynpro
U can also read the book by Chris Whealy: "Inside Web Dynpro for Java". if u have time before ur interview
all the best
GOOD LUCK
Regards
Asif

Similar Messages

Set Security Question & Answer using UME API in Web dynpro Java

Hi Experts,
I;ve developed a Web Dynpro java application to create a user in UME.
I am able to set all the user account related attributes but I am not able to set the security question and answer as I do not see any attribute for the same.
Can anyone please suggest how to set the Security question and answer in UME?
This is required so that if the user wishes to reset his password / forgets password, we can ask him the security question which he selected at the time of registration.
Please let me know if it can be achieved at the code level and whether UME API supports security question and answer or any such attribute.
Also, if no such attribute is present by default in UME at the moment; can we create/configure some custom attributes in UME and store the security question and answer into those attributes. This would serve our purpose.
Kindly assist.
Regards,
Anurag

Hi,
Thanks a lot for the reply!!!
I have one doubt here:
You've mentioned the below code to fetch the security questions in your reply:
IUser user = WDClientUser.getCurrentUser().getSAPUser();
String CUSTOMER_NAMESPACE = "com.sap.security.core.usermanagement";
String attmotname [] = user.getAttribute(CUSTOMER_NAMESPACE,"MotherName");
String attlucknum [] = user.getAttribute(CUSTOMER_NAMESPACE,"LuckyNumber");
String attmobnum [] = user.getAttribute(CUSTOMER_NAMESPACE,"MobileNumber");.
But this would be only applicable when the user has already logged on to the portal as it uses "WDClientUser.getCurrentUser().getSAPUser();" code.
On the contrary, I want the security questions and answer to be accessed even when the user is not logged on to Portal so that based on the question & answer, the user can reset his password.
Please suggest, how can we achieve this and where and how to set the custom attributes for the same?
Do we have to set the Publicly Viewable Custom Attributes present at location you mentioned in your reply?
Also, if yes; please let me know how to set the custom attributes?
Thanks & Regards,
Anurag

Question about meta-data of Web Dynpro ABAP / Web Dynpro Java

Hello together,
everywhere I can read, that Web Dynpro meta-data is platform independent.
I´ve read into a book, that the meta-data of Web Dynpro Java is saved as XML and
that Web-Dynpro Java Runtime generates runnable classes and sourcecode out of this...
- What about Web-Dynpro ABAP? Is Meta-code in ABAP is saved in XML too?
- just for theory: is ist possible to take the meta-data of a Web-Dynpro ABAP component and
generate a Web-Dynpro Java Component out of this?
I tried to find it out but i failed... In table WDR_RR_LOAD (is this the right one?) I found only the
field data. But this is a RAWSTRING and I don´t know how to make I "readable".
I must know this for my thesis for my studies, not for work.
Thank you very much !!!!
Greetings,
Oliver

Me again,
I am not sure if I understood it right...
The meta-data which describes the visual part of a view is saved as XML and
would be rendered i.e. in the webbrowser... Right?
What about the meta-data of the Web Dynpro application?
Is this meta-code into an other structure or XML too?
Thank you very much.
Many Greetings,
Oliver

Ajax in Web dynpro java

Hi experts,
Please clarify about the usage of AJAX in webdynpro java ce7.2.
The doubt is how to use ajax in ce 7.2 certain document says that ajax is embeded in 7.2 .
All what I found is navigation API's and implementation of TLN, DLN etc using AJAX and AFP as the default framework page.
Is it possible to use Ajax in webdynpro java?
Is there are jar files for using navigation API?
Please
Thanks and Regards,
Vibha

Hi Vibha,
This blog hopfully will answer your question regarding using Ajax in webdynpro java.
/people/oliver.mayer/blog/2008/11/17/web-dynpro-java-and-ajax-in-sap-netweaver-ce-71-enhancement-package-1
This how to guide shows how to use navigation API for Ajax Framework Page.
http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/d02ee44d-3f3a-2d10-3394-f3895cc3573e
Regards,
Min

Caching in Web Dynpro Java

Hi Experts,
I am trying to develop a web dynpro for java application based on RFC model.
I am using an RFC that brings the Countries and States from the R/3 and will be used as dropdowns in the views controllers.
The question is:
I would like to cache the Countries and States in my web dynpro application. The idea is not to execute the model everytime. The model should be executed only once. I would like to store these countries and states in a local java dictionary or etc. and use them for UI element designing.
Is there any way to do this in Web Dynpro Java? I would like to follow a better approach to avoid performance problems.
I do not want to follow this approach: executing the model in the wdInit method of the controller. Executing this model in this method also causes performance problems. Because the model is brining approx 1540 records from R/3.
Please advice.

Hi All,
Thank you for the suggestions.
I am a beginer in wd java. i am starting with amit's suggestion.
Step 1: Execute RFC to fetch data preferably use doInt method for it.
Should I execute the method in wdInit of the view controller/component controller?
I defined a method "executePMPReadBAPI" in component controller.
public void executePMPReadBAPI( )
    //@@begin executePMPReadBAPI()
   try{
        wdContext.currentPMPDoctorReadElement().modelObject().execute();
        }catch (Exception e){
        logger.errorT("Error in executing PMP Read BAPI");
wdInit of View controller:
          IWDAttributeInfo countryInfo =
               wdContext.getNodeInfo().getAttribute(
                    wdContext.currentContextElement().COUNTRY);
          ISimpleTypeModifiable countryType =
               countryInfo.getModifiableSimpleType();
          IModifiableSimpleValueSet countryValueSet =
               countryType.getSVServices().getModifiableSimpleValueSet();
          for (int i = 0; i < wdContext.nodeCountries().size(); i++) {
               IWDNodeElement CountryNode =
                    wdContext.nodeCountries().getElementAt(i);
               String countryKey = (String) CountryNode.getAttributeValue("Land1");
               String countryText =
                    (String) CountryNode.getAttributeValue("Landx");
               countryValueSet.put(countryKey, countryText);
This coding is working, I am able to populate the dropdowns. The problem is the application is slow.
I am guessing this much coding is not necessary in the view conroller's wdInit method.
Why the binding approach like mentioned below is not working (model>Conroller>View)? How should I execute the RFC in the wdInit of the component controller? Is this possible?
wdInit of Component Controller: Below coding and proper binding is not sufficient to populate dropdowns? Please advice.
     Zhr_Ess_Address_Input ReadInput = new Zhr_Ess_Address_Input();
          wdContext.nodeZhr_Ess_Address_Input().bind(ReadInput);
          try {
               wdContext
                    .currentZhr_Ess_Address_InputElement()
                    .modelObject()
                    .execute();
               wdContext.nodeOutput().invalidate();
          } catch (Exception e) {
               logger.errorT("Error Reading the BAPI");

Enhancements / Modifications in Web Dynpro Java

Hi, all!
I' ve a more general question: Are there any enhancement concepts for Web Dynpro Java available or at least planned that would give developers the same comfort and possibilities ABAP programmers have?
I mean, will there ever be an Enhancement Framework like in ABAP - modification free enhancements via BADIs or customer exits?
Think of one of SAPs WDJ flagship - the ESS/MSS. If you want to change anything within, you have no other possibility but to modify the sources. Considering this - together with the weak possibilities of backend access via JCo - I give the WDJ not a chance to stand the challenge of WD4A.
Regards,
Thomas

Hi!
I' m just going through the hep-pages, but what I can definitly say by now is that there' s no enhancement-concept in sight. This matter is getting kind of really embarrassing and leaves the question open: What the heck should an SAP customer persuade to focus on Java Development? No enhancements, no direct data access, no easy debugging possibilities like in ABAP.
I' ve started with WDJ, but digging deeper into WD4A I' m getting more and more convinced that the whole Java thing was just something like a playground field for the development of the programming model and is now getting more and more obsolete with the rising of WD4A.
Correct me, if I' m wrong, and forgive me, if I' m flaming, but when I started with Java development in SAP enviroment I was quite enthusiastic and didn' t understand resentiments of the ABAP developers against our programming language, but now I' m more and more joining their opinion.
Regards,
Thomas
PS: I' ve - by the way - done the SAP Java Certification and am already regretting it.

Component Initialisation in web dynpro java

Hi all,
Iam new to web dynpro java.I am using two web dynpro component suppose A and B . Iam declaring the usage of B in A so that i can embedd one of the view in Component B. I want to use the context in Component B in Component A . which component is initialised first when we run the application ...
plz give a procedure to do this task......
Thanks and Regards
prasad

Hi Prasad,
This forum is about Visual Composer. You might want to try the [Web Dynpro|Web Dynpro Java; forum for this question.
Best regards,
Tal.

Problem when generating an non-interactive form in Web Dynpro java.

Hi,
I'm trying to create a PDFDocument using a creation context in java. Everything works fine when the Interactive property of the creation context is set to true. When I change it to false however, the Web dynpro application hangs and eventually throws the following exception:
java.net.SocketTimeoutException: Read timed out
   at java.net.SocketInputStream.socketRead0(Native Method)
   at java.net.SocketInputStream.read(SocketInputStream.java:129)
   at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
   at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
   at com.sap.engine.services.webservices.jaxm.soap.HTTPSocket.readLine(HTTPSocket.java:806)
I'm wondering why this exception occurs when i'm generating a non interactive form and never appears when i'm generating a form with the Interactive property set to true.
Any ideas?
Edited by: Arjan Nieuwenhuizen on Feb 25, 2008 3:24 PM

Yeah I know changing the form properties will solve my problem, but since i'm developing a training for Interactive Forms in Web Dynpro Java, I wanted to figure out why the (static / non-interactive) combination didn't work, turned out to be a template problem, which i still didn't figure out, except the fact that having flowed content on your template is not the problem.
My ideas about your question:
When we have the layout of an Interactive Form, its clear if it's meant to be static or dynamic, we don't know however, if it's interactive or non-interactive.
I don't think we can judge a layout to have an Interactive or non-interactive purpose, can depend on the situation in which the same form is shown/used:
- One moment it can be interactive, e.g. user is filling in the form, can enter data etc.
- Next moment it can be non-interactive, e.g. form is shown to another user.
So it's more the scenario/situation that determines if the form is interactive or non-interactive.

BSP / Web-Dynpro (Java / Abap) what to use in this case ?

Hi all,
i have some questions about all this BSP/Web-Dynpro stuff. We have an application (for health care written in Visual Studio) out there at our customers. Some of these customers are using SAP as their backend system. So we've writte some backend functionality (a cash processing, additional reports, a special invoice system etc.etc.) in Abap and Abap-Objects. Actually we are planing a new release for this backend stuff which is using the normal SAP Gui.
Maybe we plan for the next release to convert our app to a Web based app and we discuss what SAP technology we should use for that.
Here are my questions :
- When and why should we use Web-Dynpro (Java) ?
- Can't we use BSP ?
- Is there any future for BSP ?
- When will Web-Dynpro for ABAP be released (actually we are not a Java Shop so Abap is prefered)?
Hope someone can answer my question.
Greetings
Henning

If you don't mind, I am going to terminate discussion of Web Dynpro ABAP here. It is not that I want to, but we are in a difficult position with this development, and can not really discuss it too much.
But, let me first make a few (last) comments:
(*) BSP is available since WebAS 610 (which is now nearly at the end of its lifetime). WebAS 620 is the main platform out there, with NW04 (WebAS 640) now shipping, and the next product is inevitably coming. If you keep in mind that SAP supports each release at least 7 years, and we will be shipping BSP in an upcoming release, you can see that with BSP you are not going to left stranded for many years to come.
(*) Web Dynpro Java is out and shipping. A very nice development environment. You can build nice things with it.
(*) Web Dynpro ABAP: it will become a very nice product as well. We should know :). But, it will definitely not ship on NW04 platform. Which unfortunately means the next great NW shipment (both naming and date is not available).
From our experience, most people seem to make their decisions based on the available Java versus ABAP skills in the shop. However, the other factor to look at is also "pixel perfect" rendering. Only with BSP can you influence the rendering. Web Dynpro is more a development platform for business applications, and as such they must conform to the designated model/concepts, etc.
brian

Introduction to Web Dynpro Java?

Where can I find a good Introduction to Web Dynpro Java?
Thanks, JJJ

Hi,
Go thru..
What is Webdynpro?
What is Web Dynpro?
Webdynpro Sample Applications and Tutorials
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/49f2ea90-0201-0010-ce8e-de18b94aee2d
SAP WebAs Samples And tutorials
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/webcontent/uuid/7d646a6c-0501-0010-b480-bf47b8673143 [original link is broken]
Basis Webdynpro tutorials....
http://help.sap.com/saphelp_erp2005/helpdata/en/15/0d4f21c17c8044af4868130e9fea07/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/e9/1fc0bdb1cdd34f9a11d5321eba5ebc/frameset.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/3a/d08342a7d30d53e10000000a155106/frameset.htm
Web Dynpro Sample Applications and Tutorials:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/webcontent/uuid/28113de9-0601-0010-71a3-c87806865f26?rid=/library/uuid/49f2ea90-0201-0010-ce8e-de18b94aee2d [original link is broken]
http://searchsap.techtarget.com/searchSAP/downloads/SAPPRESS.pdf
Check the following thread u can get lot of materials,
WeB Dynpro Documents
Refer these linkshttps://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/web%20dynpro%20tutorial%20and%20sample%20applications.faq
Why WebDynpro ?
Why WebDynpro ?
Why webdynpro and not BSP or JSP?
Why webdynpro and not BSP or JSP?BSP to WEB Dynpro
BSP to WEB Dynpro
Benifits of using Webdynpro Benifits of using
Webdynpro
Java vs. ABAP WEbDynpro Java vs.
WebDynpro ABAP
regarding Java related webdynpro
Regarding Java related Web Dynpro vs. Struts - a few questions
Web Dynpro vs. Struts - a few What kind of applications are being developed with Web Dynpro?
What kind of applications are being developed with Web Dynpro?
http://www.sappro.com/downloads/OptionComparison.pdf
Hop this will helpful for u..
Urs GS

Create a Table Dynamically in WEB Dynpro Java with diferent type of column

Hi everyone, I have a question if is possible to create a table dynamically in Web Dynpro Java?, depending of the RFC consults create the rows dynamically, ,this table must have diferent type of columns, for example link column (when the user click this link execute an action and show a adobe interactive form in another view), image column (show an image depending of the information)
Thank you everyone
Atte Israel

Hello,Israel.
Yes , it is possible through dynamic programming in wdModify of the View.
You can do this ,for example, using cell variants.
IWDTable tab = (IWDTable) view.getElement("TABLE_NAME");
IWDTableStandardCell cellV= (IWDTableStandardCell) view.createElement(IWDTableStandardCell.class,"TableStandardCell"+i);
cellV.setVariantKey("NotEditableVariant");
cellV.setCellDesign((WDTableCellDesign)wdContext.nodeTableDaysTitle().currentTableDaysTitleElement().getAttributeValue("CellDesign"+i));
IWDTextView textViewi= (IWDTextView) view.createElement(IWDTextView.class,"TextView"+i); // -- here you control the type of the object that is displayed in the cell
textViewi.bindText(dayAttrib);
cellV.setEditor(textViewi);
tabColumn.addCellVariant(cellV);
tab.addGroupedColumn(tabColumn,tab.numberOfGroupedColumns());
Using this code you can control even specific cells in the table and not only columns.
Hope this helps you,
Constantine

UWL : Web Dynpro (Java) View

Hi All,
I'm new in development/configuration of UWL. Some requirements I already could realize. But now I'm I need to implement a totally new inputfield to the task creation and some business logic behind some actions e.g. an already filled out assignment to a portal group if a task type is selected.
The only way I see is to re-create and customize the development components from the server node. Please, could you give me some hints to solve this issue in an easier way?
Thank you !!!!!
Laslo

Hello Saar,
Thanks for reply.
I have already referred & seen these links and they doesn't suit to my problem.
Below link from your suggestion talks about custom UWL Connectors, which is not the case with me. I have a SAP Standard AlertConnector.
And code extract I mentioned in my question is already working fine and able to retrieve workitems from other connectors, except this AlertConnector and that's the problem.
http://help.sap.com/javadocs/nwce/ce71/uw/uwl%20custom%20connector%20api.pdf
Also, I couldn't get clear idea from javadocs about how to read workitems from "AlertConnector".
Issue:
I have created a Web Dynpro Java DC that renders custom view for Portal UWL.
I am using UWL API to read workitems from various connectors. This is working fine so far.
Now I created a AlertConnector and alerts are appearing in SAP standard UWL view under "Alerts" tab, but they don't appear in my custom UWL application.
Is there any special way to read "alerts" from UWL API?
Following is code extract that I use currently: -
UWLView uwlView = uwlService.getViewManager(uwlContext).getView("DefaultView", uwlContext);
IUWLItemManager itemManager = uwlService.getItemManager(uwlContext);
QueryResult queryResult = itemManager.getItemsForView(uwlContext, uwlView, null, mycompoundExpression);
ItemCollection results = queryResult.getItems();

How to use Web Dynpro Java isChanged and isChangedByClient

Hello,
I have read thorugh a lot of documentation, threads, ... --> but the picture is not geting clearer fro me.
We have Web Dynpro Java Application (on Netweaver 7.0 SP12) running in Enterprise Portal. We need to tell the portal work protect mode, that we have unsaved changes (how to do this is clear).
I am struggling with figuring out, that my Web Dynpro Context has unsaved changes. I found the two change-indicators isChanged() and isChangedByClient(), which already confuses me a little bit.
Anyway, this is what I have figured out so far:
I am calling wdContext.currentContextElement().isChangedByClient() to figure out changes and when a Save operation has been completed sucessfully, I call wdContext.currentContextElement().node().getContext().resetChangedByClient(). This works for some of the changes made by the user.
I then tried calling wdContext.nodeABC().getElementAt(i).isChanged() for all nodes of my Web Dynpro Context, but this results in detecting changes before the user ha done any interaction.
Implementing an own change tracking (i.e. by adding a changed-Attribute to each context node) does not seem a viable option for me.
So these are my questions:
- Does anyone now a working pattern relying on those chnage indicators ?
- Does anyone now how to reset the isChanged indicator (or when it is resetted by the framework) ?
Any help appreciated.
Thank you,
Stefan

Hi
Check this link
Re: How to keep isChangedbyClient flag set between roundtrips?
http://help.sap.com/javadocs/NW04/current/wd/com/sap/tc/webdynpro/progmodel/api/IWDNodeElement.html
Thanks

Reimporting RFC inro web dynpro java project

Hi,
I tryed to reimport RFC into my web dynpro java application.
It warn me with message below
Message
Adaptive RFC Reimport could lead to inconsistence of R/3 metadata cashed on the J2EE server
Thus it is recommanded to invalidate the cache,
this could be done either by restarting the J2EE server or by using Adaptive RFC Metadate Cache Invalidation Tool within Webdynpro Console
Question
How can i use RFC Metadate Cache Invalidation Tool ?
Thanks.

Hi Friend,
Have A look On This Document Hope It will help.
[Metadata Cache Invalidation for Adaptive RFC Models|http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/10465350-b4f5-2910-61ba-a58282b3b6df&overridelayout=true]
And Let Us Know If Still face any issue.
Regards
Jeetendra

Maintaining custom Web Dynpro Java applications

We are a relatively new Web Dynpro Java shop, and I hope to propose a standard for code modification documentation to my organization. I have a few questions for WDJ maintenance developers:
When documenting creation and modification activities, what is the benefit of using the javadoc comment convention?
In the controller implementation tab, when I use the Source --> Add JavaDoc Comment tool, the comment block is always inserted into the
//@@begin imports
tag. Is the automatically generated tag
//@@begin documentation
in the controller implementation tab useful? Should summary information and ongoing modification comments for the controller be stored here?
Does anyone require full javadoc comments on every new method? @param, @return, @exception?
Do the NWDS/Eclipse Tasks and/or Bookmarks provide any real value? I have observed that bookmarks are useless for flagging code changes because they are dropped whenever edits are saved. I'd like to leverage Tasks, are there any examples of using them successfully that can be shared with me?

The Java source in Web Dynpro is generated from the meta-data. Manual changes must be done exclusively inside the so-called user coding areas marked by comments //@@begin ID ... //@@end. That has the consequence that many of the Eclipse source code and refactoring functionality does not work anymore resp. is overwritten by the code generation step. Please be careful.
Armin

Interview Question on Web Dynpro JAVA

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