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Coffee instead of snakes – Openshift fun (2)

February 8th, 2012 • Comments Off on Coffee instead of snakes – Openshift fun (2)

In my last post I demoed how OpenShift can be used to deploy WSGI based Python application. But since OpenShift also supports other languages including Java I wanted to give it a shot.

So I developed a very minimalistic application which emulates a RESTful interface. Of course it takes the simplistic – all time favorite – Hello World approach for this. Client can create resources, which when queried will return the obligatory ‘Hello <resource name>’.

To start create a new java application in your OpenShift dashboard. When cloning the git repository – which was created – you will notice that you basically get a maven project with some templates in it. Now you can simple use maven to test and develop your application. When done do a git push and your application is ready to go.

The implementation is pretty straight forward:

 * Simple REST Hello World Service.
 * @author tmetsch
public class HelloServlet extends HttpServlet {
    protected final void doGet(final HttpServletRequest req,
            final HttpServletResponse resp) throws ServletException,
            IOException {

So beside from extending the HttpServlet class all you need to do is implement the doGet and doPost methods. When done edit the ‘web.xml’ file in the folder src/main/webapp:


This will make sure you the application can be found under the right route. If you like you can also add an index.html file in the same folder so people can read a brief introduction when visting the top layer of you application. In my case that would be – The application itself can be found under:

So I like the approach OpenShift takes here with maven. You can simply add you dependencies like jmock, junit etc. and during deployment it is taken care of that everything falls in place. Also if you write Unittest it’ll also ensure that you’re application will work – Non functional apps will not be deployed obviously if you write a Unittest and use maven. It’s pretty easy to write Unittest for the HttpServlet class if you use a mocking framework like jmock. You can get the source code at github.