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How to Write a Custom Mediator in WSO2 ESB

I will use WSO2 Developer Studio to write the custom mediator.

Click Developer studio tab and click open dashboard.

You can write the mediator logic in the following. 
Next create a carbon application project.

Next give the project name and select necessary dependencies.

Give a project name and click finish.

Next click "create archive"

Select the location (in file system) , Click 'OK'

Place the mediator (.car) to wso2esb-4.0.3/repository/deployment/server/carbonapps

The following code is a sample proxy service which will use a custom mediator
<proxy xmlns="http://ws.apache.org/ns/synapse" name="test" transports="https,http" statistics="disable" trace="disable" startOnLoad="true">
         <class name="org.wso2.carbon.sample.FirstMediator" />
         <log level="full" />
               <address uri="http://localhost:8282/services/SimpleStockQuoteService/" />
         <send />

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