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1. Download and setup WSO2 Developer Studio.
2. Open the Developer Studio and select File > New > Other.
   
3. From the window that appears, select Carbon Composite Application Project and click Next.
   
4. Provide a suitable name to for the Carbon application project. For the purposes purpose of this example, name it as "WS_NumberAdderCarbon". Click Finish once done.
   The Carbon composite application project is created and you can see it on Project ExploreExplorer pane on the left of your Developer Studio screen.
5. Create a new BPEL project. To do this, rightRight-click on the project which is on the Project ExploreExplorer pane and choose New > BPEL WorkFlow. If it does not appear there, click Other and search for BPEL WorkFlow on the search bar. 
6. On the “Create New BPEL Project” wizardWorkFlow wizard, select Create New BPEL workflow and click Next to continue.
7. Provide suitable names, a namespace and select the matching template for your BPEL process and project. More information on the different templates can be found here. 
   In For this example, we use "BPELNumberAdder" as the project name. Also provide a valid namespace as the process namespace. Since we are creating the synchronous business process, select the template “Synchronous BPEL Process”.the following values can be used: 
   
   • Project Name : BPELNumberAdder
   • Process Name : AdderProcess
   • Namespace : http://NumberAdder.com
   • Template : Synchronous BPEL Process
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8. Click Finish to close the wizard.

   Expand the "WS_NumberAdderCarbon" project folder in the "Project Explore" pane to view another folder named "BPELNumberAdder". The "BPELNumberAdder" project is used here for BPEL process development. The “Project Explorer”

   The Project Explorer window and the AdderProcess.bpel file will look like the following.
   

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   Note
   This point onwards you have to design your BPEL process by adding business logic to the BPEL process. In this guide we will be designing a simple process to add two integers.

9. Open “AdderProcessArtifactsAdderProcessArtifacts.wsdl” wsdl file in BPELNumberAdder Project in order to set input parameters. Click and click on the blue arrow next to "Adder Process Request".
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   It  It will open another tab called “Inline Schema of Add”. By default it will have a single variable named “input” with type string. Rename it as x and set the type to int.You need to add another element. To add another element right-click on "AdderProcessRequestType" and “add an element” after it. Name it "y" and set the "type" as "int" InlineSchemaofAdderProcessArtifacts.wsdl.
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10. Rename the default variable named as "input" as x and change the type from "string" to int. 
11. Add another element by right-clicking on AdderProcessRequestType>Add an element. Name it y and set the type as int. Now it should look like the follwing image.
    

12. Now lets design the simple business logic. Open the AdderProcess.bpel bpel file. You need to add business logic in the place of where “FIXFIX_ME-Add_Business_Logic_Here” Here activity resides. Delete the “FIXFIX_ME-Add_Business_Logic_Here” Here element. You will have the following process.

    Info
    To delete, right-click on the element and choose delete.

    

13. Now you need to add Add an Assign activity in between “receiveInput” receiveInput and “callbackClient” callbackClient activities. To add Assign activity drag it from the Action section of the Action Palette.

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    Another way to add activity element to the editor is right-click on element and use add-before option.

    

14. Now you need to configure Assign activity. Click on “Assign” element which is on BPEL process the Assign element and then click on “Details” Details tab in ”property window”the Properties window. 
15. Click on “New” which New which will lead you to the following view in “property window”
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16. We will use an Xpath expression to compute the addition of two variables and assign the result to the output variable. To do that choose “Expression” from “From” select Expression from the From drop down list and choose “Variable” from “To” select Variable from the To drop down list.
17. Choose “Xpath 1.0 in BPEL 2.0 ” as Expression Language.
18. The Expression which we need to evaluate is “

    Include the following expression in the box below "Edit the associated Xpath Expression".

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    $input.payload/tns:x + $input.payload/tns:y

    ”. Include this in the box below “Expression Language”.Select “result:string” under “To” as the assigned variable.
19. While you configure the variables, The editor will send you the a message will appear asking you to initialize the variables. Click Yes. It will automatically generate an XML string for variable initialization. The property Properties window of Assign activity should look like the following once you have completed the steps.
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20. Now you need to define inbound and out bound interfaces. Open the deploy.xml file which is in the BPEL project. Choose AdderProcessPort as the inbound address port Inbound Address Port from the given list. The rest of the parameters will be automatically filled in once you select it. There will not be any ports for  You do not need to specify ports outbound interfaces as we do not have external invocations in this particular business process.
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21. Include the BPEL process as a dependency of the Carbon Application Composite Application (WS_NumberAdderCarbon). To include it, open “pompom.xml” xml of Carbon Composite application project and select the BPELNumberAdder checkbox as a dependency. 
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Deploying and testing the BPEL process

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1. In Developer Studio, right-click on the "Servers" Servers window and select New -> ServerNew>Server. If it is not visible, select Window -> Show View -> ServersWindow>Show View>Servers.
2. The New Server window appears. From the list, expand the WSO2 folder and select WSO2 Carbon 4.4 based server as shown below. Carbon 4.4 based server is selected here since BPS 3.5.0 is based on Carbon 4.0.2. If needed, specify the Server name here. In this example, we specify it as WSO2 BPS. Click Next.
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3. Set the CARBON_HOME by clicking the Browse button and selecting WSO2 Business Process Server home folder_Home directory. Click Finish once done or Next if more settings of the server need to be configured such as the 'service port', 'web console port' etc.
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4. Once done, WSO2 BPS is added to Servers List as shown below.
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5. The next step is to deploy the carbon composite application in WSO2 BPS. Simply click on "Go to WSO2 BPS Server>Add and Remove and select the WS_NumberAdderCarbon " project in "Project Explore" window and drag and drop it on Server.  The server will be automatically started.
6. If the server does not get started automatically, run the server by right-clicking click on it the server and selecting "select Start". In Console the console window, note the server process's log. 
7. The WSO2 BPS login page will be opened open automatically in the default web browser. Login using admin as username and admin as password.
   

8. Select "processes →list" menu from the "Main" Processes >BPEL>List from the Main menu. The "Deployed Processes" window opens with the "AdderProcess" deployed.

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   The "Process ID" is generated in the format {"Process NameSpace"} ProcessName-VersionNo.

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9. Click the Process ID.

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10. The "Process Information" window appears with the details of the process. Click on the "Try It" link. 
    
11. A browser window opens to enter the required input parameters. Enter the values and click "Send" for the answer.press Send to calculate the result.