When a PojoCache instance is obtained from a PojoCacheFactory, it is required that the either a org.jboss.cache.config.Configuration object is passed, or more typically a String indicating the location on the classpath or filesystem of an xml configuration file is provided. In the latter case, PojoCacheFactory will parse the xml to create a Configuration. PojoCache will simply pass the resulting Configuration to the underlying Core Cache implementation. For details on the configuration please see the "Configuration" chapter in the the JBoss Cache User Guide.