Here is a collection of things that may be useful to you that are not part of the core driver. For assistance or support you should contact the channels specified in each item, instead of the core driver lists/team.
Statement Caching Wrapper
Wraps the core driver to enable caching of PreparedStatement objects. Not all application servers support this functionality in their connection pools and not all applications are deployed onto application servers. http://jdbccache.projects.postgresql.org/