I have just released the very first version of the JCR Transport for Mule. This transport supports JCR 1.0 (Java Content Repository 1.0, as defined by JSR 170) repositories and is a receiver only. It leverages the asynchronous notification mechanism, named observation, to receive events whenever a change occurs in the repository and is not intended for storing nor reading messages from a content repository.
Indeed the use case for this connector is to monitor a content repository for particular events and to transform these events into fully-resolved serializable content-rich objects that Mule ESB can route to interested endpoints or components, enabling them to trigger actions like instantiating work-flow sequences or flushing caches.
Developing this connector using Mule's Transport Artifact was very easy, the biggest part of the code being in the (optional) augmentation of the JCR events with content from the repository. The development environment that MuleSource has opened to developers, named MuleForge, uses all the good tools of the moment like Subversion, Confluence, Jira, Bamboo and, of course, Maven ; with Xircles as the one platform to bind them all in a consistent dashboard.
MuleForge has allowed me to develop, build, distribute and document this transport in a very efficient and professional way. For example, the wiki templates look exactly like the Mule ESB official guide, which is a great plus for the end-users who will experiment a consistent reading experience.
All in all, MuleForge is a smart initiative that fosters creativity and contribution around a powerful and well-established open source product. I vouch the efforts MuleSource has put in setting up this environment will pay: it will nurture projects contributed by a vibrant community of users and developers and will eventually enrich the overall Mule ESB offer.