I am working on a large migration project from phpbb to JForum. I am using version 2.1.9. In terms of caching techniques, there is no clear documentation about how long the objects getting cached. JForum in build using default caching techniques, but it has implementation for EHCache as well as JBoss Tree. But what is the best caching practice do JForum recommends. As far as I can see all of them are in-process caching techniques. I fear that may trigger frequent garbage collection. In case I opt of out-process caching techniques like memcached or Terracotta, which one should fir in to the bill? I can see on 2.1.9 no ehcache.xml!!!