ClassNotFoundException for SingletonEhCacheRegionFactory

Create a Dynamic Web Project with a single entity class (here called test.Pet ). Copy the jars from the required and optional/ehcache directories of the Hibernate 4.1.12 distribution into the WEB-INF/lib directory of the project. Add the following hibernate.cfg.xml : <hibernate-configuration> <session-factory> <property name= "hibernate.connection.driver_class" >org.h2.Driver</property> <property name= "hibernate.connection.url" >jdbc:h2:test</property> <property name= "hibernate.dialect" >org.hibernate.dialect.H2Dialect</property> <property name= "hibernate.cache.use_second_level_cache" > true </property> <property name= "hibernate.cache.use_query_cache" > true </property> <property name= "hibernate.cache.region.factory_class" > org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory </property> <mapping class= "test.Pet" /> </session-factory> </hibernate-configuration> Use the config XML in a new Hibernate configuration (I selected Annotations and Hibernate 4.0), then expand the configfuration's Session Factory subtree.