Adding Two Integers in Oracle Service Bus (OSB) 12c using Java Method Callout

Oracle Service Bus (OSB) offers extensive modularity, allowing for the integration of a diverse range of technologies. In this article, we will explore how to use Java methods in OSB with the objective of implementing a use case that involves adding two integers . We will achieve this by leveraging a Java callout, which will enhance the flexibility and functionality of our integration solution."

To get started, let's create a Java class and generate a JAR file from

package Addpkg;

public class AddInt {

    public AddInt() {

        super();

    }

    

    public static int addNum(int num1,int num2)

    {

        int num3=0;

        num3=num1+num2;

    return    num3; 

    }

}

 

Now create JAR file of the above class by following this tutorial  Generate JAR in JDEVELOPER

Once JAR file generated , now lets create Application in JDEVELOPER 

1. Go to Jdeveloper --> Create Application

Provide Application Name 

Once Application Created , Create a Project --> Service Bus Project

Provide project Name : AdditionJavaPRJ

Create folders in newly created project as shown in below screenshot

Now click on Schema , Create New --> Click XML Schema 

Provide XML Schema name AdditionNum.xsd to create XSD 

Add Number1 & Number2 as two input elements and Result as output element 

Now schema definition has been created , next step is to create WSDL based out on these xsd. 

Provide WSDL file name 

Select Interface Type as Synchronous Interface and select Input and Output response as shown in the screenshot. 

With above step , WSDL generation completed. If you still have doubt refer this link WSDL Generation in JDEVELOPER

"The next step is to add the JAR files to our recently created project folder. Copy the JAR files that were created in the above step into the 'JAR' folder of the project

Now let's create proxy services

Click on Proxyservices folder --> Click on New -->  Proxy Service

Provide Proxy Service Name and add the WSDL file name 

Select the recently created WSDL and Click on OK

Click Finish 

Proxy Services Created 

Click on Pipeline and add PipeLine Pair 

Add Java Callout to the Project as shown in the screenshot 

Now select the JAR file along with the  method 

select the JAR file 

select the Method Name and click on OK

Provide input parameters as shown in the below screenshot 

provide variable name as Outputvar to capture the returning value from Java method. 

Java call out activity completed , now we need to capture the response . Drop Replace component at Response pipeline

Configure Replace component parameters 

Location : body

value : $Outputvar

Replace option : Replace node contents 

Run the project in Jdeveloper 

Here is the output response