Talend Service Factory Examples

As Dan has already mentioned, we have created a number of documented examples which have been tuned to run within the OSGI Karaf container shipped as part of the Talend Service Factory release.

The OSGI container in the release is really an optimized OSGI-aware Web Services stack with only the most relevant bundles being loaded. We've also tried to take care of minor issues such as ensuring that the default HTTP port is 8080 and that the HttpService context is set to "/services" by default as opposed to "/cxf". You can set these initial settings in 30 seconds yourself - but don't you want the demos just to work without having to know how to configure pax web and cxf osgi properties from the very start :-) ?

We have some serious plans to make sure CXF plays really well in OSGI - please keep an eye on the CXF dev list. We will want to make sure the CXF services and indeed the consumers just work in OSGI.

Additionally, most of the examples provide options for starting the services from the command line and within the servlet container.

Next I'd like to actually spend a bit of time and describe what examples we ship. What we have now is some classical CXF examples, such as the one demonstrating all sorts of CXF interceptors in action and additionally prepared to run in the OSGI container. The OSGI-fied example demonstrating SOAP over JMS specification is also there.

Finally we have started closing the gap which has existed in the area of JAX-RS demos and we've added 6 new demos.

Two first demos are called jaxrs-intro and jaxrs-advanced with the idea to show the basic JAX-RS features and then progress to a more involved example, not only showing more sophisticated JAX-RS features but also applying them to solving a reasonably interesting problem, traversing the Person family tree in a number of ways and updating individual Persons. These demos will be regularly updated.

The next 2 demos, jaxrs-jaxws-java-first and jaxrs-jaxws-description-first show how SOAP and RESTful services can be combined.
The first one shows how both JAX-WS and JAX-RS annotations can be combined on a single interface, how endpoints can share the same service bean and how both JAX-WS and CXF JAX-RS proxies can effectively use the same code for invoking on the services. The second one shows how SOAP services developed using a WSDL-first approach can be selectively exposed as RESTful services by applying an external CXF-JAXRS user model giving that modifying the interface generated from WSDL is not an option.

What we actually want to show with these 2 demos is that making this experience as seamless as possible is a top priority for us - we do want users to really like developing both SOAP and RESTful services with CXF.

The next demo, jaxrs-jms-http, shows how a typical JAX-RS HTTP server can be enhanced to receive the JMS messages with just adding few extra lines to the configuration. As noted here, you may want to do it if you'd like to preserve your investment in the JAX-RS but also make sure the service is capable of getting the messages from a variety of (transport) channels. This demo also shows how HTTP requests can be processed oneway with the server picking up the messages and forwarding them further to the JMS destination.

The last example is jaxrs-jaxws-authorization. This example shows CXF authentication and authorization interceptors in action, authenticating the users via JAAS and populating the CXF SecurityContext with Principal and its roles, and then enforcing the authorization rules for both JAX-WS and JAX-RS endpoints. The JAAS interceptor is only used when the demo is run within Karaf so that the Karaf JAAS context can be resolved. When the demo is deployed into the servlet container, the container-managed authentication is utilized to populate the current Principal.

This demo will be significantly simplified in the next release due to the recent related CXF enhancements (the topic of the next post).

You'll see many more examples added in time.

So please download the examples and give them a try. Note, you have to register in order to download the examples, this is due to the fact the examples content in general is considered to be a premium content at Talend, hopefully it won't be a problem for those who are interested.