Jackrabbit 1.4 is out: unfortunately the Provider implementation used for jackrabbit 1.3 is not binary compatible with jackrabbit 1.4, although it is source compatible (it just needs to be compiled with the appropriate jackrabbit version).

In order to support jackrabbit we should create a different provider implementation (two modules compiled with two different jackrabbit versions, not really nice) or doing some dirty hack using reflection (should be just a single method call actually).

PS: I've been testing snapshots builds from jackrabbit 1.4 for a few months in a clustered environment and it looks very good (faster, never had memory issues)