Tuesday, 27 December 2016



 I came across this thing recently, and generally as we developers do, I did some head banging.
Assuming that theory is not what you are looking for, this post will land you in the arena directly, with working demo, following the old school tradition - a 'Hello World' program 🙂.

This will be involving ESB 5.x.x, based on the online documentation it is too easy to proceed with the installation part, Fedora 24 or any other yummy UNIX flavor.

I suggest you to install ESB bundle with Eclipse Luna from the site, since the latest version available i.e. the one with Eclipse Mars, will throw lot of NPEs in the environment.

package abc;

import org.apache.synapse.MessageContext;
import org.apache.synapse.mediators.AbstractMediator;

public class MedTester extends AbstractMediator {

    public boolean mediate(MessageContext context) {
        // TODO Implement your mediation logic here
        System.out.println("Wassup ??????? ");
        return true;

Steps to follow ahead -

Upload the jar for the above class in wso2esb-5.x.x/repository/components/lib folder.

Start the analytics server then your core server.

Add a sequence with class mediator.

Make sure class is uploaded successfully.

Create an API for invoking your above sequence.

Hit the below url using curl command -

curl -X GET

Here you go! Enjoy the output. 🙂

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