Accessing ABAP Functions in Web Dynpro Java · Accessing ABAP Functions in Web Dynpro Java Applies...

Accessing ABAP Functions in Web Dynpro Java

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Applies to: Web Dynpro Java in SAP NetWeaver 7.0 (2004s)

Summary This tutorial shows how to use the Adaptive RFC model to connect to a SAP backend.

• Level of complexity: Intermediate

• Time required for completion: 60 min. Author: SAP NetWeaver Product Management Company: SAP AG Created on: 08 December 2007



Table of Contents Sample Projects ............................................................................................................................................ 3 Creating a Web Dynpro Application Accessing ABAP Functions................................................................. 3 Objectives...................................................................................................................................................... 3 Prerequisites ................................................................................................................................................. 4

Systems and Authorizations...................................................................................................................... 4 Setting Up the SLD Connection .................................................................................................................... 4 Maintaining the JCO Destinations in the Web Dynpro Content Administrator.............................................. 5 Importing the Project Template into the SAP NetWeaver Developer Studio................................................ 5 Developing the Application – Steps .............................................................................................................. 5 Developing the Application – Steps .............................................................................................................. 6 Creating a Model........................................................................................................................................... 6 Creating the Context and Binding it to the Model ......................................................................................... 9

Creating a Context for the Custom Controller ........................................................................................... 9 Mapping Custom Context Elements to View Context Elements ................................................................. 10 Mapping Custom Context Elements to View Context Elements ................................................................. 11

Adding Dependencies to the Views......................................................................................................... 11 Creating a Context for the SearchView................................................................................................... 11 Creating a Context for the ResultView .................................................................................................... 12

Creating Actions and Declaring Methods.................................................................................................... 13 Creating Actions and Declaring Methods.................................................................................................... 14

Creating the Search Action ..................................................................................................................... 14 Declaring the executeBapi_Flight_Getlist_Input() method...................................................................... 15

Editing the UI Elements............................................................................................................................... 15 Editing the UI Elements............................................................................................................................... 16

Editing UI Elements for the Search view................................................................................................. 16 Editing UI Elements for the ResultView................................................................................................... 17

Adding the Implementation of the Backend Connection............................................................................. 18 Implementing the Action Event Handler .................................................................................................. 18 Adding the Implementation for the Custom Controller FlightListCust ..................................................... 18

Building, Deploying, Configuring and Running Your Application................................................................ 19 Building, Deploying, Configuring and Running Your Application................................................................ 20

Prerequisites............................................................................................................................................ 20 Building the Project.................................................................................................................................. 20 Deploying the Project .............................................................................................................................. 20 Creating the JCO Connections in the Content Administrator.................................................................. 20 Launching the Application ....................................................................................................................... 21 Result....................................................................................................................................................... 22

Related Content .......................................................................................................................................... 23 Copyright ..................................................................................................................................................... 24



Sample Projects To follow the tutorial step by step, download the initial project here:

• WDJ_Tut_AdaptiveRFC_70_Init.zip To check the ready-to-use tutorial, download this project:

• WDJ_Tut_AdaptiveRFC_70.zip (some configuration steps have to be performed nevertheless)

Creating a Web Dynpro Application Accessing ABAP Functions The following tutorial shows you how to design, implement, deploy, and run a basic Web Dynpro application that accesses persistent data from a remote SAP system. In the Web Dynpro application, you will connect to the remote SAP system, the backend, using the Adaptive RFC model. To access database tables, you can make use of existing functions in the form of RFC function modules. For each function module that you need, the system generates a corresponding Java proxy class. All the generated proxy classes and interface are bundled together in the RFC model and treated as part of your Web Dynpro project. For the purposes of this tutorial, you design a simple, structured Web application, which will display flight connections between a given departure and destination airport. The user interface for this Web application will consist of two views. In the first view, the user should be able to enter the departure and destination airports in the appropriate input fields and trigger display of the flight data using a Search button. As a result of this query, all the available flight data will be displayed as a table in the next view.

Objectives By the end of this tutorial, you will be able to:

• Create a model that is used to connect to the SAP backend from the Web Dynpro project

• Implement access to remote function modules in an SAP system

• Implement custom controllers for specific tasks that cannot be assigned to a single view

• Create contexts for the custom controller and bind them to the model

• Create view contexts and map them to the custom controller context

• Bind UI controls to view context elements

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Prerequisites

Systems and Authorizations • The SAP NetWeaver Developer Studio is installed on your computer.

• You have access to the SAP Web Application Server

• You have access to a remote SAP back-end system. To test this example application successfully, you must also make sure that this SAP system contains the function module BAPI_FLIGHT_GETLIST and the appropriate data from the flight data model. To access functions within a SAP system, a user must provide this system with valid credentials by means of the logon process. Since you are using the Web Dynpro Adaptive RFC Layer, the user ID defined in the Web Dynpro Content Administrator of your SAP NetWeaver Application Server will take care of the connection automatically.

• The SAP System Landscape Directory (SLD) and the SLD bridge are configured and running. The SLD contains component information about all SAP software modules, the system landscape description and the name reservation service. The SLD bridge is used to transform the system data to the SLD server compliant format.

• For more information, see also the Post-Installation Guide for the System Landscape Directory of SAP NetWeaver 7.0 or have a look at the documentation regarding SAP System Landscape Directory (requires SMP Login).

In order to connect the logical systems defined in the Adaptive RFC model with a physical SAP system you need to perform two configuration tasks.

Setting Up the SLD Connection To establish a connection to the SLD server you have to specify the HTTP connection parameters. You will carry out this task in the Visual Administrator while the SAP NetWeaver Application Server is running. Proceed as follows:

1. Start the SAP NetWeaver Application Server if you have not already done so. 2. Start the Visual Administrator using the path <Drive>:\usr\sap\<System

ID>\JC00\j2ee\admin\go.bat. 3. Choose Connect and log on to the SAP NetWeaver Application Server. You need administrator

rights for the login process. 4. After login, choose the Cluster tab on the left, expand the node Server, Services, and choose

SLD Data Supplier. 5. Choose CIM Client Generation Settings and specify the necessary HTTP connection parameters

to establish a connection to the SLD. 6. Save the data by pressing the Save button 7. Choose the CIM Client Test button to check the CIM client connectivity. 8. If the test was successful, you can close the Visual Administrator console. Otherwise correct your

connection parameters. Now you have defined the connection parameters for SLD server has to be used to run your application.

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Maintaining the JCO Destinations in the Web Dynpro Content Administrator The logical system names used in the model declaration need to be associated with an actual SAP system defined in the SLD before this application can be executed. You will carry out this task after deploying your example application in the Web Dynpro Content Administrator. If you do not perform this step, then you will only be able to build and deploy the application, but you will be unable to run it.

Importing the Project Template into the SAP NetWeaver Developer Studio ...

1. Download the ZIP file WDJ_Tut_AdaptiveRFC_70_Init.zip, which contains the initial Web Dynpro project TutWD_FlightList_Init and save it in a local directory or directly in the workspace of the SAP NetWeaver Developer Studio.

2. Unzip the contents of the ZIP file WDJ_Tut_AdaptiveRFC_70_Init.zip into the workspace of the SAP NetWeaver Developer Studio or in local directory.

3. Call the SAP NetWeaver Developer Studio. 4. Import the Web Dynpro project TutWD_FlightList_Init.

The Web Dynpro project TutWD_FlightList_Init then appears in the Web Dynpro Explorer for further processing and editing in the context of this tutorial. The warnings triggered by the Web Dynpro project TutWD_FlightList_Init can be ignored at this time, since we will extend the Web Dynpro project during the remainder of this tutorial and will thus remove the displayed warnings. Without the additions we will make, the initial Web Dynpro project template TutWD_FlightList_Init cannot be executed.

In the Navigation Modeler, the initial Web Dynpro project looks as follows: The FlightListWindow contains a SearchView, which inherits a ViewContainerUIElement embedding the ResultView.



Developing the Application – Steps The following description of how to extend the example application with access to ABAP functions is split into two sections: ...

1. Creating a model and context elements and bind them: ...

a. Add a new FlightModel that is based on the Adaptive RFC. b. In the custom controller FlightListCust, create an appropriate context structure and bind it to

the model FlightModel. c. Create appropriate context structures in the views SearchView and ResultView and map

them to the context structures of the custom controller FlightListCust. 2. Creating an action, declaring a method, and adding the implementation of the back-end connection:

...

a. Define an action Search in the SearchView that will trigger the query to the back-end system. By declaring a method in the custom controller FlightListCust the query is sent to the back-end system.

b. You bind the UI elements to the context structures or the action. c. As a last step before building, deploying, and executing, you must implement the back-end

call.

Creating a Model You use a model to specify where the data for your Web Dynpro application is to come from. Since you are using a remote SAP system to retrieve the flight data, you can make use of an existing model. You will import an adaptive RFC model into your project for this purpose. This step also includes in particular generating Java proxies, which represent the corresponding RFC function modules in your Web Dynpro project.

1. In the project structure, expand the node Web Dynpro → Models.

2. From the context menu, choose Create Model. The appropriate wizard appears.

3. Choose the Import Adaptive RFC Model option, followed by Next. 4. Enter the model name FlightModel and the package name

com.sap.tut.wd.flightlist.model.

When importing an adaptive RFC Model you have to specify the logical system names for model instances and RFC metadata:

• Change the default logical system name for model instances WD_MODELDATA_DEST to WD_FLIGHTLIST_MODELDATA_DEST

• Change the default logical system name for RFC metadata WD_RFC_METADATA_DEST to WD_FLIGHTLIST_RFC_METADATA_DEST

The logical systems will later be separately configured using the JCO Connections screen of the Web Dynpro Content Administrator (see section Building, Deploying, Configuring, and Running Your Application).



5. Accept the suggested values and choose Next. 6. Enter the appropriate data for logging on to the SAP system and choose Next. 7. Enter either the complete name of the function module BAPI_FLIGHT_GETLIST in the appropriate

field or enter the start of the name followed by an asterisk (*). Then choose Search. 8. Select the function module BAPI_FLIGHT_GETLIST from the list that appears.



9. Choose Next. By doing so, you automatically trigger the generation process. The import process is logged by a detailed description, which you can see in the next dialogue. To confirm choose Finish.

10. Now the java proxies are generated and a new model node FlightModel is inserted into project structure.



Creating the Context and Binding it to the Model The custom controller FlightListCust is responsible for retrieving flight data from an SAP system, so it needs to be able to map the corresponding input and output for the flight model. To establish this correspondence between the custom controller and the model, you will create an appropriate controller context and then bind the context nodes to the model structure. In this way, you can ensure that the model data is stored and manipulated in a central location. Adding a model to the Web Dynpro component

1. In the project structure, expand the tree up to the node Web Dynpro → Web Dynpro Components → FlightListComp.

2. Select the node Used Models, open the context menu and choose Add. 3. In the list that appears, select the model FlightModel and confirm by choosing OK. By doing so,

you specify that all views and controllers of FlightListComp have a dependency relationship with the FlightModel.

Creating a Context for the Custom Controller 1. In the project structure, double-click the name of the custom controller (in this case,

FlightListCust).

2. Choose the Context tab if necessary.

3. Open the context menu for the root node Context and choose the option New → Model Node. 4. Enter the name Bapi_Flight_Getlist_Input for the model node and choose Finish.

5. From the context menu for the model node that you have just created, choose Edit Model Binding… 6. Choose the model class Bapi_Flight_Getlist_Input, followed by Next.

7. Activate the following entries: Destination_From and Destination_To. Expand Output and activate Flight_List. Choose Finish.

The Developer Studio refreshes the context tree appropriately.



In this way, you have completed specification of all the context nodes for the input and output data. You will need this context later for the SearchView and the ResultView.

8. Save your work by choosing the icon (Save All Metadata) from the toolbar.



Mapping Custom Context Elements to View Context Elements In this step you will learn how to map context elements of the custom controller FlightListCust to the appropriate context elements of the views SearchView and ResultView.

Adding Dependencies to the Views ... ...

1. Navigate to SearchView (Web Dynpro → Web Dynpro Components → FlightListComp → Views → SearchView) and open the ViewDesigner with secondary mouse button.

2. Choose the Properties tab. 3. Under Required Controllers, choose Add. 4. In the list that appears, choose the FlightListCust component.

5. Confirm by choosing OK. 6. Repeat steps 1-5 as appropriate for the ResultView view.

You have now entered the appropriate dependency on the custom controller FlightListCust for each view.

Creating a Context for the SearchView ... ...

1. Open the View Designer for the SearchView again and choose the Context tab.

2. Open the context menu for the root node Context and choose the option New → Model Node. 3. Enter the name Bapi_Flight_Getlist_Input for the model node and choose Finish. 4. From the context menu of the model node that you have created, choose Edit Context Mapping… 5. Choose the custom context node Bapi_Flight_Getlist_Input, followed by Next. 6. Activate only Destination_From and Destination_To. Choose Finish.



The Developer Studio refreshes the context tree appropriately.

Creating a Context for the ResultView 1. Open the View Designer for the ResultView again.

2. Choose the Context tab.

3. Open the context menu for the root node Context and choose the option New → Model Node. 4. Enter the name FlightList for the model node and choose Finish.

5. From the context menu of the model node that you have created, choose Edit Context Mapping…

6. Expand the custom context structure Bapi_Flight_Getlist_Input → Output, then choose Next.



7. Choose the node Flight_List, then choose Finish.

The Developer Studio refreshes the view context tree appropriately.

8. Save your work by choosing the icon (Save All Metadata) from the toolbar



Creating Actions and Declaring Methods To trigger display of the flight data from the SAP system, in the SearchView, you need to create an action that can be bound to a UI element, such as a button. You can then implement the event handler, which reacts to this action.

Creating the Search Action ...

1. Open the View Designer for the SearchView.

2. Choose the Actions tab. 3. Choose the New pushbutton.

You can create a new action in the wizard that appears. 4. Enter the name Search for this new action, leave the other settings unchanged, and choose

Finish. An event handler, onActionSearch, is automatically created for this new action.



Declaring the executeBapi_Flight_Getlist_Input() method

1. Open the editor for the custom controller FlightListCust again.

2. Choose the Methods tab. 3. Choose New. 4. Select the Method option and choose Next. 5. In the wizard screen that appears, enter the name executeBapi_Flight_Getlist_Input for

this new method and assign it the return type void. Choose Finish.

The method executeBapi_Flight_Getlist_Input is added to the custom controller.

6. Save the new metadata by choosing the icon (Save All Metadata) from the toolbar.



Editing the UI Elements

Editing UI Elements for the Search view .

1. Open the SearchView in the View Designer by clicking the Layout tab of the View Editor.

The View Designer displays a predefined default text. Simultaneously, the Outline view displays a list of the UI elements included. If you select an element in the Outline view or on the Layout tab, its associated element properties are shown in the Properties view.

2. Choose following UI elements that have been included in the project template and give them following properties:

Property Value

For FromCityInputField

Value Bapi_Flight_Getlist_Input.Destination_From.City

For ToCityInputField

Value Bapi_Flight_Getlist_Input.Destination_To.City

For SearchButton

Event > onAction Search

The View Designer displays the following layout for the SearchView:




Editing UI Elements for the ResultView

1. Open the ResultsView in the View Designer by clicking the Layout tab.

2. Select the Table on the Outline tab and choose Create Binding from the context menu.

3. In the wizard that appears, you can specify table columns that will be displayed in the TableView. Select the FlightList model node and press Next.

4. On the next screen leave all the other values unchanged and choose Finish. The value FlightList is automatically assigned to the dataSource property of the table UI element and all selected table columns are created for the TableView. The View Designer displays the following layout for the ResultView.




Adding the Implementation of the Backend Connection

Implementing the Action Event Handler ...

1. In the View Designer, choose the Implementation tab for the SearchView.

The Developer Studio runs several generation routines, and then displays the updated source code for the implementation of the view controller.

2. Insert the following line of code in the onActionSearch() method: /** declared validating event handler */ public void onActionSearch(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent ){ //@@begin onActionSearch(ServerEvent) // The event handler onActionSearch triggers the remote function call wdThis.wdGetFlightListCustController().executeBapi_Flight_Getlist_Input(); //@@end }

Adding the Implementation for the Custom Controller FlightListCust ...

1. Open the Controller Editor for the custom controller FlightListCust again.

2. Choose the Implementation tab. 3. In the standard method wdDoInit(), between //@@begin wdDoInit() and //@@end, add the

following lines of code: /** Ho k meo thod called to initialize controller. */ public void wdDoInit() { //@@begin wdDoInit() // Create a new element in the Bapi_Flight_Getlist_Input node Bapi_Flight_Getlist_Input input = new Bapi_Flight_Getlist_Input(); wdContext.nodeBapi_Flight_Getlist_Input().bind(input); // Create new elements in the Destination_From and Destination_To nodes input.setDestination_From(new Bapisfldst()); input.setDestination_To(new Bapisfldst()); //@@end }

4. In the method executeBapi_Flight_Getlist_Input(), between //@@begin executeBapi_Flight_Getlist_Input() and //@@end, add the following lines of code: /** de larec d method */ public void executeBapi_Flight_Getlist_Input( ) { //@@begin executeBapi_Getlist_Input() try { // Calls remote function module BAPI_FLIGHT_GETLIST wdContext.currentBapi_Flight_Getlist_InputElement().modelObject().execute(); // Synchronise the data in the context with the data in the model wdContext.nodeOutput().invalidate(); } catch (Exception ex) { // If an exception is thrown, then the stack trace will be printed ex.printStackTrace(); } //@@end }

5. To add the import statements, position the cursor anywhere in the Java Editor and choose Source → Organize Imports from the context menu.



The following import statements are added to the source code, without your having to do anything more:

//@@begin imports

import com.sap.tut.wd.flightlist.model.Bapi_Flight_Getlist_Input;

import com.sap.tut.wd.flightlist.model.Bapisfldst;

import com.sap.tut.wd.flightlist.wdp.IPrivateFlightListCust;

//@@end




Building, Deploying, Configuring and Running Your Application You have now reached the last stage in the development of you example application. However, some preparation is still essential before you can deploy and run the application successfully on the SAP NetWeaver Application Server. Go through each of the following prerequisites carefully.

Prerequisites • You have made sure that the relevant ABAP system, which you will be accessing remotely to

retrieve the flight data, is currently available and contains flight data.

• You have made sure that the SAP NetWeaver Application Server has been launched.

• You have checked that the configuration settings for the SAP NetWeaver Application Server and for the SDM server are entered correctly in the Developer Studio.

• To check the server settings, choose the menu path Window → Preferences → SAP J2EE Engine.

• The connection parameters for the used SLD are defined in the Visual Administrator.

Building the Project ...

1. If you have not already done so, save the metadata for your project in its current state. 2. In the Web Dynpro Explorer, from the context menu of the project node

TutWD_FlightList_Init, choose Rebuild Project.

Deploying the Project

3. In the Web Dynpro Explorer, select the project node TutWD_FlightList_Init and choose Create Archive from the context menu.

4. Choose Deploy Project from the context menu of the project node.

Creating the JCO Connections in the Content Administrator The logical system names used in the model declaration must be associated with an actual SAP system defined in the SLD before this application can be executed. For this reason you need to create JCO connections in the Web Dynpro Content Administrator. To use an adaptive RFC model in your Web Dynpro application you will define two connections:

• A connection to get the needed (dictionary) meta data information

• A connection to get the read the application data To create the new JCO connections proceed as follows: ...

1. Open the Web Dynpro Content Administrator on your SAP NetWeaver Application Server using the URL: http://<host>:<port>/webdynpro/welcome.

2. If you are using the Content Administrator for the first time, you need to perform the self registration.

3. Select the Browse tab and navigate to the application node local→ TutWD_FlightList_Init→ Applications→ FlightListApp.

4. Choose the JCO Connections tab. Two destinations named WD_FLIGHTLIST_MODELDATA_DEST and WD_FLIGHTLIST_RFC_METADATA_DEST are shown in this view and both of them have the status red. This means that the JCO connection is not yet maintained in assigned SLD.



5. Select WD_FLIGHTLIST_MODELDATA_DEST and choose Create to configure a new JCO

connection. a. Go though the steps of the JCO connection creation wizard and specify the connection data. b. After making the required entries, press Finish. c. Test your configuration data by pressing the Test button.

6. Do the same for WD_FLIGHTLIST_RFC_METADATA_DEST.

The both destinations are ready to use.

7. If the tests were successful, you can close the Content Administrator. Otherwise correct your

connection entries.

Launching the Application 8. In the Web Dynpro Explorer, open the context menu for the application object FlightListApp.

9. Choose Run.



Result The Developer Studio performs the deployment process and then automatically launches your application in the Web browser. Test your Web Dynpro application by entering a valid city name for the Departure City and Arrival City and then clicking the Search button. Provided the system contains the appropriate flight data, it will display it in a table.



Related Content • Tutorials & Samples for Web Dynpro Java

• Web Dynpro Models: Backend Access

• Importing an Adaptive RFC Model

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Accessing ABAP Functions in Web Dynpro Java · Accessing ABAP Functions in Web Dynpro Java Applies...

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