Exchanging data between a Web Dynpro application and SAP Web Shop

I'll try to keep this as clear as possible:
1) We have the SAP Internet Sales system running, which has a series of Business Object classes and corresponding Backend Layer objects that can return data from several sources.
2) We are able to create our own Backend Layer objects that would return data from a component called IPC, which is a Java component.
3) I would like a Web Dynpro application to retrieve data from this backend layer object, but I am not experienced enough with Java to know if what I want to do is possible. I don't think that I can use JCo, because I am trying to get a Java component (class?) in Web Dynpro to access a Java class remotely.
4) I think I am asking is this: is there a way for a Java to Java connection to be created, much like Web Dynpro can use JCo to connect Java to ABAP systems?
If this is a glaringly obvious question to Java programmers, my apologies!
- Tony.

Somebody on another forum recommended using RMI. Which would be the better option in terms of ease of implementation?
- Tony

Similar Messages

  • Connect Web Dynpro Application to a Web service

    Hi experts,
    I am trying to connect a Web Dynpro application to a SOAP Web service.
    I have downloaded the WDSL code and save it to a file in my hard disk.
    I used the create model wizard (Import adaptive web service model) and created a model in my Web Dynpro application.
    I have connected the component controller with the model and the view of the application to the controller.
    All content node elements that have created automatically in the model, have in cardinality property the value 0..1.
    I created input elements in the view but they are gray and not available (disabled).
    The read only properity of the input elements has the value "false".
    I tried to initiate the input element by putting the following code in wdDoInit() but with no luck.
    wdContext.nodeRequest_ProcessTransaction().nodeProcessTransaction().nodeTransactionRequest().nodeHeader().nodeMerchantInfo().currentMerchantInfoElement().setAcquirerID("xxxx");
    Can someone help with this?
    Thanks in Advanced.

    Hi,
    After importing the model, you need to create the instance for the model. Instantiate the Request object and then set the input parameters. Then you have to call the execute function, then the model will be executed and you will get  the data.
    Also instead of putting the code which you have wriiten in init, you can use:
    wdContext.nodeMerchantInfo().currentMerchantInfoElement().setAcquirerID("xxxx");
    You can directly access the node, no need to traverse the whole hierarchy.
    Regards,
    Manoj

  • Calling a Web Dynpro application from a web application

    Hi everyone, I've got a problem I hope someone can help me resolve.
    What I wanna do is to show a login form, which is part of a J2EE web application (contained in a SAP Web AS), an after the user submits the required information, I have to redirect the user to a Web Dynpro application, which is contained in the same Web AS, but I have to redirect this user using single sign on.
    I'm not sure about what I have to do, I'm new in these technologies, I think I need to use UMFactory, but I have made some investigation and I'm not so sure about what I have to do yet, can anyone give me a hand with this?

    Hi Joel,
    Please follow the documents below
    https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/80fbc690-0201-0010-1aba-93d5c8232b4a
    http://help.sap.com/saphelp_nw04s/helpdata/en/b0/4d2b418a3edb2be10000000a1550b0/content.htm
    Hope this helps.
    Regards,
    Kiran Kandepalli.

  • When to use WEb Dynpro application and Portal application in NW dev studio

    I would like to know what is the difference between
    webdynpro application  and EP Application using PDK.
    Are they comaparable  ...Which one has an edge over the other specific to any applications.
    I want develop an application related to e-commerce using the SAP R3 as backend for an industiry(where in a registered user can place an order and query on the staus of order. All the data will be stored in R3 ).
    I am planning to dev this using NW dev studio , but have an appehension about which application is useful for this kind of application either webdynpro or EP application .
    can anybody explain which one has edge over the other ( Webdynpro or EP applcations in context with NW Dev studio) and why.
    thanks
    PK

    Hi,
    <b>Webdynpro</b> is used when requirements ask for a prototype using minimal time n effort.
    Highly skilled programmers are not necessary to write a webdynpro application
    It uses dynamic controls without reloading the page.
    <b>Portal components</b> esp Abstract portal component provides a lean method to write HTML command to web client
    Large interactive components requires more programming.
    <b>WebDynpro</b> is a highly declarative, tool-based programming model. It minimizes platform-dependent "plumbing" code for building UIs and maximizes declarative metadata describing huge portions of a typical application in a platform-independent way.
    Web Dynpro follows a "top-down" approach in order to consistently support multiple runtime platforms.
    In Web Dynpro you just have to drag & drop the UI components.
    <b>Portal components</b> has followed a "bottom-up", programming-driven approach to Web development.
    Regards,
    Pooja.

  • Web Dynpro application calling external web server using HTTPS giving error

    Hello,
    I don't know whether this is the right question in this forum but my ABAP web-dynpro applicaiton is expected to call another HTTP application on external web server through HTTPS. Presently it is calling through plain HTTP but we want to have HTTPS.
    Here are the steps that we followed based on the link from help.sap.com
    1] Received the certificate files from external web server
    2] Created SSL Anonymous client
    3] Imported the certificate files under this client and added into the certificate list
    4] Re-started ICM
    5] Created RFC Destination of type HTTP to connect to external server with SSL option and basic authentication. This RFC destination was working under plain HTTP.
    When tried with Test connection it gave error "ICM_HTTP_CONNECTION_FAILED".
    Any idea what might be missing. Thanks in advance.
    Regards
    Rajeev

    Used proper certificate after which the error went away

  • Web Dynpro UI Vs SAP Web UI

    I have been trying to understand this but don't see enough material on this topic.
    As we know, we can always go for SAP Web UI (Web version of SAP GUI) to web enable SAP Transactions. I would like to know what are the specific advantages and differences between standard SAP Web UI and Web Dynpro UI approach.
    I guess, we can share our own experiences and thoughts on this and may be we can reach on some conclusion.
    Thanks
    Chandra

    Hi,
    go through:[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/10c671f2-6364-2a10-8d96-8b3145d4a478]
    for SAP web ui chk this link:[https://media.sdn.sap.com/html/submitted_docs/dotnet/Reference/SAP.Web.UI.Controls.html]
    for web dynpro UI info go through:[https://www.sdn.sap.com/irj/sdn/nw-ui]
    Regards
    Khushboo

  • Help - developing a web-based application and supporting web service

    I am in need of creating a web service that provides some reusable components, and then creating a web application that is also a client of the web service. Is it ok to put both on the same application server? Can anyone give me a timeframe for how long it takes to create a web service + web application from scratch? I'm sorry if the questions sounds dumb, I am a newbie to this and am just trying to learn as I go. Thank you for any help!

    In answer to your first question, yes. You can have both your web service and web application on the same application server. This is a normal development scenario for lots of applications. As far as a timeframe on how long it takes to create a web service + web application from scratch that depends on the complexity of both the web service and application you are writing. A simple web service and application written by an experienced web services developer could be written in a day. A more complex application could take weeks/months.
    Hope this helps!

  • Difference between mobile web dynpro and simple web dynpro application

    Hi Everyone,
    Can anyone pls let me know what's the difference b/w mobile web dynpro application and an offline or simple web dynpro application.
    Thank U!!
    Ravi Aswani

    Hi ,
    Mobile WebDynpro
    The SAP Web Application Server allows direct online access to Web Dynpro applications using mobile devices. As part of the SAP Web Application Server, Web Dynpro provides a development and runtime environment with which you can quickly and simply create professional user interfaces for desktop PCs or for mobile devices. An appropriate infrastructure and renderer classes are provided for developing mobile Web Dynpro applications for Pocket PCs as well as for BlackBerry Wireless Handhelds and Nokia Series 80 devices.
    http://help.sap.com/erp2005_ehp_03/helpdata/EN/fa/100d4113eff16fe10000000a1550b0/frameset.htm
    WebDynpro Java
    Web Dynpro is a client-independent programming model of the SAP NetWeaver technology platform for developing user interfaces for professional business applications. It is based on the model view controller paradim which ensures that the business logic is separated from the presentation logic. This architecture is visible in the Web Dynpro perspective of the SAP NetWeaver Developer Studio (NWDS).
    Web Dynpro helps you with the development of Web applications by:
    ·        Ensuring platform-independence with the meta model approach
    ·        Minimizing the implementation effort through declarative programming
    ·        Supporting a structured design process by applying the model view controller paradigm
    ·        Providing reuse and better maintainability by using components
    ·        Providing graphical support with tools in the Web Dynpro perspective
    ·        Providing the SAP NetWeaver Java Development Infrastructure (NWDI) which supports team work with different services such as source code versioning and the Central Build Service.
    http://help.sap.com/erp2005_ehp_03/helpdata/EN/fa/100d4113eff16fe10000000a1550b0/frameset.htm
    Thanks
    Suresh
    Edited by: Suresh Mandalapu on Sep 2, 2008 11:07 AM

  • Using EJBs in Web Dynpro Applications

    I have recently started to develop Web applications using the Web Dynpro framework. Coming from a pure J2EE world, I must admit that Web Dynpro has a few innovative features that I find interesting for user interface development. The use of component & view contexts, for example, is not unlike the ActionForms that one may find in a Struts application, but pushed a bit further. No complaints here.
    What I do have some problems with is the whole CommandBean paradigm that is put forth by SAP (refer to the document <a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webdynpro/using%20ejbs%20in%20web%20dynpro%20applications.pdf">Using EJBs in Web Dynpro Applications</a>).
    I do understand the usefulness of defining a model that will be used to generate and eventually bind to Context data structures. That's fine. What I do object to is the use of a so-called CommandBean to play that role. Again, coming from a J2EE world, I am familiar with the BusinessDelegate pattern - which would typically be used by a client application to invoke business logic on the server side. I would propose that a better, cleaner way of integrating EJBs with the Web Dynpro framework would be to use a BusinessDelegate for invoking business logic, and importing a separate and distinct ModelBean (instead of a CommandBean) to be used for defining and binding to Context data.
    I have built one Web Dynpro application thus far. Instead of using a CommandBean, I created a ModelBean that extends my business object DTO (Data Transfer Object) (which is quite appropriate for that role, given that it implements all the get & set methods that are required for the business data that I need to model). My Web Dynpro application also makes use of an independant BusinessDelegate that is packaged with my EJB DC - this is a standard best practice on J2EE projects. I have been asked by the people working with me to modify this architecture to bring it more in line with the SAP way of doing things. I am open-minded and willing to learn and accept new ways of thinking and doing things. However, I fail to understand the usefulness of merging structure and behaviour by resorting to CommandBeans:
    - <b>It violates the MVC paradigm</b> by having one object (the CommandBean) serve as both model AND controller as far as the Web Dynpro application is concerned. The CommandBean is obviously a model - since it is literally imported as such into the Web Dynpro application. It is ALSO a controller from the Web Dynpro's application perspective, since all calls to the back-end go thru the CommandBean via one or more of its execute_xxx methods. In contrast, the use of a business delegate by the Web Dynpro application clearly separates the model (the CommandBean... or rather, a more suitably named ModelBean) from the controller (BusinessDelegate).
    - <b>Doesn't carry its own weight</b>. In other words, I haven't yet been provided with any valid justification for going thru the extra effort of coding the CommandBean's execute methods. It's been proposed to me that it somehow serves as an abstraction layer between the Web Dynpro application and the business logic. I would argue that it is the BusinessDelegate's role to abstract away the back-end logic from clients. If one does have a BusinessDelegate available, I would argue there's no need to code execute methods in a separate CommandBean. To prove my point, I would simply point out that all of the CommandBean examples that I have seen so far, either in How-To documents, or in production code, all follow the same pattern....
    CommandBean.execute_doSomething() calls BusinessDelegate.doSomething()
    Not a heck of an "abstraction" layer... I would in fact argue that it is worse than useless. If some major change occurs in the business logic that requires changing the doSomething() operation, we expect of course to modify the BusinessDelegate. The Web Dynpro client will also presumably need to be modified - that's to be expected, and unavoidable. But then, we'll also need to go about and change the CommandBean's execute_doSomething() method - again, extra work for no apparent benefit. Adding and removing business methods has the same implication. All this for an layer that simply adds the prefix execute_ in front of all business method calls... Is this "abstraction layer" worth the cost of creating and maintaining it ??
    - <b>Unnecessarily complicates error handling</b>. I have been told that for technical reasons, it is recommended that all exceptions thrown by the CommandBean be of type WDException or WDRuntimException. But what if the client application needs to react differently to different failure scenarios ? When I create a business object, I might wish to provide the user with an error messages if connection is lost to the backend, and with a different error message if an object already exists in the database with the same attributes. In order to do that, I will have to catch the WDException, extract the cause, and continue processing from there... possible, yes, but clearly less standard and more labor intensive than the classical try/catch mechanism.
    To say nothing about the fact that SAP's own API documentation clearly states that applications using Web Dynpro can reference and catch WDExceptions, but THEY MUST NOT THROW OR EXTEND IT !
    - <b>Produces unnecessary DCs</b>. Page 6 of the aforementioned document presents an architectural view of a Web Dynpro project that uses a CommandBean. Why an extra DC for the CommandBean ?? I created my ModelBean class right inside the Web Dynpro project (in the Package view). That, to me, is where this class should reside, because it is created for no other reason that to be used by this particular Web Dynpro application. What is the benefit of placing it in its own independant DC ?
    - <b>Not a typical application of the Command pattern</b>. The well-documented command pattern (Design Patterns - Gang of Four) has been devised mainly to enable encapsulation of request as objects, thereby making it possible to:
    - specify, queue and execute requests at different times
    - decouple execution of a command from its invoker
    - support undo operations
    - support logging changes so that they can be reapplied in case of system crash making it possible to assemble commands into composite commands (macros), thereby structuring a system around high-level operations built on primitive operations.
    None of this applies to the way the SAP CommandBeans are being used. Not that much of an issue to people new to J2EE and/or OO development... but quite confusing for those already familiar with the classic Command pattern.
    At this point, I fail to understand the advantage of merging structure (model) and behaviour (execute methods) through the use of a unique CommandBean object. Am I missing something ?

    Hi Romeo,
    You would be disappointed, this reply ain't anywhere nearby to what you are talking about...
    I wanted to mail you, but you have not mentioned your email in your profile.
    I am really impressed by your flair for writing. It would be far better had you written a blog on this topic. Believe me, it would really be better. There is a much wider audience waiting out there to read your views rather than on the forums. This is what I believe. To top it, you would be rewarded for writing something like this from SDN. On the blogs too, people can comment and all, difference being there you would be rewarded by SDN, here people who reply to you would be rewarded by you. Doesn't make  much a difference.
    Anyways the ball is still in your court
    As far as I am concerned, it has still not been much time since I have started working on Web Dynpro. So can't really comment on the issue...
    Bye
    Ankur

  • Developing a web dynpro application compatible to two JCO destinations

    I have created a web dynpro application and integrated into a portal, which access R/3 using a JCo destination and retieves the data using a BAPI.
    But I want to integrate the same application into another portal, which would access the different R/3 system having the same function module.
    Is there any way for switching between two Jco destinations as the same application could be made to work for both the systems.
    please suggest me as I am stuck up with this issue.
    Thanks and regards
    kris

    hi Radha Krishna
    Thanks for your reply,
    Currently I have three iviews for the complete application Can you please tell me where to do the settings:
    In the application properties dothe following:
    Use the following url parameter to the
    application URI sap-wd-arfc-useSys=<DEFAULT_SYSTEM>:<SUFFIX_OF_MAPPED_SYSTEM>
    In the default system you can change your JCo destination name.
    where do I do all these settings.
    Kindly let me know.
    Thanks and regards
    kris

  • Convert JAVA Web Dynpro to ABAP Web Dynpro application

    Hi,
    I was hoping someone could tell me if there is a way to port a JAVA Web Dynpro application to ABAP Web Dynpro. We have some JAVA WD apps that would now make more sense to have running on our ABAP system so we would like to convert them to ABAP WD apps.
    I know the theory is that WD is metadata/XML based so it should be possible to port the WD definition to ABAP and have the ABAP runtime generate the application again in ABAP. I expect that any custom code that is written in JAVA would need to be manually rewritten in ABAP - but it would be great if there was tool or method to at least port the majority of the application.
    Thanks in advance for your help,
    Simon

    Hi Simon
    You are correct in thinking that all WD apps are based on metadata, but unfortunately, the similarity between WD Java and WD ABAP is just a conceptual one, and no such tool exists to convert one to the other.
    In addition to this, there are certain implementation differences between ABAP and Java that mean you could not convert one to the other.  For instance, the whole concept of model objects does not exist in WD ABAP. Therefore, structural entities used in WD Java such as model components could not be tranlsated into anything that exists in ABAP, because the concept is redundant in the target language.
    Sorry about that, but Java and ABAP are sufficiently different beasts that such a tool is not possible.
    Regards
    Chris W

  • Problem of Creating a web dynpro application based on a car rental web serv

    Based original SAP developer studio examples shipped with the developer studio, I first create J2EE application “QuickCarRental”. It works at http://192.168.254.4:50300/QuickCarRental.
    A web service “QuickCarRentalWebService” is defined in J2EE application “QuickCarRental”. My web dynpro application “TutWD_CarRental” is web service consumer invoking “QuickCarRentalWebService”.
    When I deploy “TutWD_CarRental” on SAP J2EE engine and  run the application at http://192.168.254.4:50300/webdynpro/dispatcher/local/TutWD_CarRental/CarRentalApp, i can see the web dynpro web application interface right.
    however, I get the following error when I input some data and Click button rent a car.
    Service call exception; nested exception is: com.sap.engine.services.webservices.jaxrpc.exceptions.InvalidResponseCodeException: Invalid Response Code: (404) Not Found.
    when i click Display all bookings, the error is:
    Service call exception; nested exception is: com.sap.engine.services.webservices.jaxrpc.exceptions.InvalidResponseCodeException: Invalid Response Code: (404) Not Found.
    I install SAP developer studio on my winXP desktop, and the SAP developer studio version is 2.0.10.
    I have my SAP Web application server and J2EE engine Version 6.40 run on a different machine. the SAP server IP address is 192.168.254.4
    could anybody give me some clue on this. is that because i miss some configurations on SAP server for enabling web services of “QuickCarRentalWebService”?
    Thanks!
    Thomas

    HI
    Find here.
    https://www.sdn.sap.com/irj/sdn/downloaditem?rid=/library/uuid/9fc0e990-0201-0010-199c-e38fc6dafb5d
    Thanks
    Lohi.

  • Web dynpro application using workflow

    Hi all,
    I have developed a web dynpro application and attached that to the portal, so the user will login into the portal and will access the application. We have a new requirement now, when a user enters the data and hit save button on the web dynpro application, the workflow should trigger and should send the filled out (everything filled in) web dynpro application to his superior, the supervisor should be able to click on a link (which he should get through workflow) and should get the web dynpro application filled in. I am not sure how can I do this, so can you please guide me through.
    Thanks,
    Raj

    Hi Raj,
    could I suggest perhaps that you have a good search of SCN - there have been multiple posts about this sort of thing in the past.
    for example : the wiki article
    [Integrating WebDynpro ABAP applications with UWL for workflow in Portal|http://wiki.sdn.sap.com/wiki/display/WDABAP/IntegratingWebDynproABAPapplicationswithUWLforworkflowin+Portal]
    is it perhaps that you do not use the UWL at your site? Or do you want to to send an email to the manager with a link directly to the approval application? The last case is one that I've come across many times before - it just means that you'll need to generate an approval task that is ended by a wf event and send an email to the manager with a URL parameter in the launch of the WDA application so that the app can pick up the details required to display and raise the WF event to complete the approval wf task.
    There are all sorts of ways of persisting the information in the form so that the manager can see it in the approval. You can use the workflow container, you can use a db table, you could even use a shared memory area (not that I'd recommend this for this usage). But this is more a case of how to persist information in a workflow and probably a better question (search first, it's probably been answered already) for the WF forum and not the WDA forum.
    Good luck in designing and building your application. Perhaps when you are done you could write a blog about your experience and further share how to do this with others.
    Cheers,
    Chris

  • Value hep problem in web dynpro application

    Hi All,
    I have a requirement where I need to add a field for alternate payee to the web dynpro application and the field name is BSEG-EMPFB. I have written the following code to get the values of it based on the vendor number:
    SELECT SINGLE * FROM  lfb1 INTO f4lfb1_z
                      WHERE lifnr = lv_lifnr
                      AND   bukrs = '001'."bseg-bukrs'.
      CALL FUNCTION 'FI_VENDOR_ALTERN_PAYERS_READ'
        EXPORTING
          i_lifnr            = lv_lifnr
          i_filkd            = filkd
          i_bukrs            = '001'
          i_lfb1_head_office = f4lfb1_z
        TABLES
          t_zemtab           = t_zemtab.
      LOOP AT t_zemtab INTO w_zemtab.
        ls_value_set-text = w_zemtab-empfb.
        ls_value_set-value = w_zemtab-empfb.
    append ls_value_set to lt_value_set.
    DATA lo_nd_alt_payee_info TYPE REF TO if_wd_context_node_info.
    DATA lo_nd_alt_payee TYPE REF TO if_wd_context_node.
    lo_nd_alt_payee = wd_context->get_child_node( name = wd_this->wdctx_alt_payee ).
    lo_nd_alt_payee_info = lo_nd_alt_payee->get_node_info( ).
             lo_nd_alt_payee_info->set_attribute_value_set(
                name =  `ALTERNATE_PAYEE`
                value_set = lt_value_set )
    Now the problem is user wants the details of the alternate payee as F4 help and when I debugged the standard FV60 functionality this how the F4 help is being build therE:
    REFRESH fldtab.
      CLEAR fldtab.
      fldtab-tabname    = 'IZEMTAB'.
      fldtab-fieldname  = 'EMPFB'.
      fldtab-selectflag = 'X'.
      APPEND fldtab.
      CLEAR fldtab.
      fldtab-tabname    = 'IZEMTAB'.
      fldtab-fieldname  = 'NAME1'.
      APPEND fldtab.
      CLEAR fldtab.
      fldtab-tabname    = 'IZEMTAB'.
      fldtab-fieldname  = 'ORT01'.
      APPEND fldtab.
      CLEAR fldtab.
      fldtab-tabname    = 'IZEMTAB'.
      fldtab-fieldname  = 'STRAS'.
      APPEND fldtab.
    *------- Fill Values for Function Module Call --------------------------
      REFRESH valtab.
      LOOP AT zemtab.
        valtab-feld = zemtab-empfb.
        APPEND valtab.
        valtab-feld = zemtab-name1.
        APPEND valtab.
        valtab-feld = zemtab-ort01.
        APPEND valtab.
        IF zemtab-stras NE space.
          valtab-feld = zemtab-stras.
        ELSEIF zemtab-pfach NE space.
          CONCATENATE 'Postfach:'(019) zemtab-pfach INTO valtab-feld.
        ELSE.
          valtab-feld = space.
        ENDIF.
        APPEND valtab.
      ENDLOOP.
    *------- F4 Dialog -----------------------------------------------------
      CALL FUNCTION 'HELP_VALUES_GET_WITH_TABLE'
        EXPORTING
          display      = space
          fieldname    = 'EMPFB'
          tabname      = 'INVFO'
        IMPORTING
          select_value = empfb
        TABLES
          fields       = fldtab
          valuetab     = valtab.
      IF NOT empfb IS INITIAL.
        invfo-empfb = empfb.
      ENDIF.
    can you please tell me how can I accomdate this in the web dynpro application?
    Thnaks,
    Edited by: rajatg on Jul 13, 2011 6:41 PM
    Edited by: rajatg on Jul 13, 2011 6:42 PM

    Hi Raja,
    Search help is availble at dictinary level you get F4 help automatically.
    Otherwise create OVS help for alternate payee. use WDR_OVS.
    check this..
    http://wiki.sdn.sap.com/wiki/display/WDABAP/InputhelpofObjectValueSelectioninWDABAP
    /people/shruti.rathour/blog/2008/05/05/ovs-help-in-web-dynpro-abap
    Cheers,
    Kris.

  • How to make use of Portal service in the web dynpro application

    hi
    I have some portal service and how to use that in the web dynpro application.
    and also what is the main diff between Portal Component and web dynpro application.
    do we required portal to run web dynpro application.
    thanks
    mmukesh

    Hi,
    >> I have some portal service and how to use that in the web dynpro application.
    Yes. U can use Portal service in webdynpro. Check the link given by subathra.
    >> and also what is the main diff between Portal Component and web dynpro application
    Portal Components are components designed to run in portal server while webdynpro application can run in J2EE WebAS.
    >> do we required portal to run web dynpro application.
    No for general cases. Just WebAS is sufficient to run webdynpro appl. But if u use portal service in ur webdynpro appl, then make sure both (portal service and webdynpro appl) run on same J2EE engine. That is mandatory.
    Regards,
    Vijai

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