This post will contain detailed instructions on how to do a XML to XML transformation using WSO2 ESB 4.9.0. WSO2 Developer Studio 3.8.0 is used to create the project.

Create Maven Multi Module Project

Create Maven Multi Module Project with following details. This is the parent project for all the other projects.

Group Id - com.wso2.training.SmooksDataMapper

ArtifactID - SmooksDataMapperLab

Create Registry Resource Project

To create a Registry Resources Project, go to File -> New -> Projects -> WSO2 -> Repository and select Registry Resources Project.

Name : SmooksRegistryProject
Group ID :com.wso2.training.SmooksRegistryProject

Create a new Registry Resource for Smooks Configuration. Select From Existing Template option and select the template as Smooks Configuration.

ResourceName : SmooksConfigXMLToXML

Template : Smooks Configuration

Registry : Conf

Registry Path :/system/config/smooks

Now you will see smooks-configuration file has been created and it will be open in the embedded JBoss Smooks editor.

Create a Composite Application Project

Create CAR project

Name : SmooksDataMapperCAR
Group ID : com.wso2.training.SmooksDataMapperCAR
Tick specify Parent from Wokspace

Add following two files there under a folder.

model-input.xml

<order id='444'>
    <header>
           <customer number="555">Amila</customer>
    </header>
    <order-items>
       <order-item id='1'>
           <product>1</product>
           <quantity>2</quantity>
           <price>400</price>
           </order-item>
    </order-items>
</order>

model-output.xml

<salesorder>
 <details>
       <orderid></orderid>
       <customer>
           <id></id>
           <name></name>
       </customer>
    </details>
    <itemList>
       <item>
           <id></id>
           <productId></productId>
           <quantity></quantity>
           <price></price>
       </item>
    </itemList>
</salesorder>

Define Smooks Configuration

Go to Smooks Configuration

Set Input type as xml
Add the input model with data(model-input.xml) by browsing the workspace

That will automatically create a input model in input model view

Then click on the add button on Input Task and then click on apply template

set Message Type as XML and click on Next

Set “Create Template From:” as Sample XML & point the mapping model(model-output.xml) from workspace and then click on finish.

This will dynamically generate the graphical model as follows.

Configure Mapping

You can do the mapping by just connecting relevant elements or attributes by clicking on one element on the input model and connecting it to the corresponding element in the output model as shown below. Ensure to do the mapping from top to bottom or else the configuration will fail at run time. So do the mapping exactly as shown below.

Run Smooks Configuration

Add libraries from smooks framework. To add these libraries select the Registry Resources project and go to Project -> Properties.
Select Java Build Path and go to Libraries tab.
Click on Add Library button and you will see Add Library page which has WSO2 Classpath Libraries entry at the bottom.
Select WSO2 Classpath Libraries and click Next.
Now you will see a multi-tab page which includes most of the third party libraries that will be needed for your SOA development. To add smooks related libraries, go to Smooks tab.

Select all the libraries and click Finish.
Now you will see, all the smooks related libraries are added to project classpath.
Now you can run smooks configuration file by right click on the file (SmooksConfigXMLToXML.xml) and select Run As -> Smooks Run Configuration
If your mapping was successful it will create the output as below.

Create ESB Proxy Service

Create a new ESB config Project

Name : SmooksTransESBProject
Group Id : com.wso2.training.SmooksTransESBProject
Select Specify Parent from Workspace

Create new proxy service within that ESB config project

Proxy Service Name : SmooksTransProxy
Proxy Service Type : Custom Proxy

Add mediators to the inSequence of the proxy as follows.

Log Meidator - Log Level : Full
Smooks Mediator - Configuration Key : SmooksConfigXMLToXML.xml (Select by browsing the workspace)
Log Mediator - Log Level : Full
Add respond Mediator

Deploying the CAR file

Go to the pom.xml of the Composite Application Project (SmooksDataMapperCAR)
Select SmooksRegistryProject and SmooksTransESBProject as the dependencies.
Right clieck on CAR project -> Export Composite Application and give a Export Destination
Then go to ESB management console and upload the CAR file.

Test the Service

Test using try it tool and give the input as follows.

<order id='764'>
    <header>
           <customer number="444">James</customer>
    </header>
    <order-items>
       <order-item id='7'>
           <product>6</product>
           <quantity>8</quantity>
           <price>543</price>
       </order-item>
    </order-items>
</order>