This article will guide you to build simple integration with a purpose concatenate two strings using OSB.
Open Jdeveloper à
Create Application with Name -> ConcatStringApp
Once Application is created then will create a new Project under the newly created Application à
ConcatStringPRJ
Once project created will create folder structures specific
to components for example
The schema folder will have WSDL schema definitions , WSDL
folder will have WSDL files and ProxyServices folder will have contents related
to proxyservices
So now Project created, next step is to create WSDL. To create WSDL, we must create Schema
definitions and based on that WSDL file will be created.
Click on Schema Folder and Click on XML Schema
Create Schema Definition by following below screenshot
Once Schema definition (XSD) created , next step is to create WSDL file based on this newly created XSD
Provide the name of WSDL as Concat.wsdl and select Interface Type as Synchronous Interface as our WSDL will have response as well.
select Input and output Response as shown in the screenshot.
Selecting Input Response from newly created schema definitions
Selecting output Response from newly created schema definitions
Click on OK to create WSDL file
This is how your WSDL will look
Now using this WSDL file we will create Proxy Services .
Go to the ProxyServices folder and Click on New and then Click on Proxy Service
Provide the service name as ConcatProxyService
Click on WSDL radio button
Select the WSDL file which we have created for this project
Click Next and Finish to complete the creation of Proxy Services
Along with Proxy Services , Pipeline also gets created. Click on Pipeline
Once you click on Pipeline , drag the Pipeline Pair
After dragging the pipeline , drag Replace function to the Response Pipeline node
In the Location , Select Body
in
Value , from the dropdown select
XQuery Expression 
Go to Functions Tab and Click on Strings
Click on Concat function
Provide the parameters
I'm providing first parameter as "Hi" as i want to concatenate with payload input string
Use payload input string as second string which will concatenated with the first string
Click on Replace Node Contents
Run the integrations
Execute the payload by providing the input string
Here is the final concatenated string
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