We are using: Jboss 4.2.2 GA Hibernate EntityManager 3.2.1.GA Hibernate Annotations 3.2.1.GA Hibernate 3.2.4.sp1 Following example for defining the index: | @Column | @org.hibernate.annotations.Index(name = "test_idx") | public String getUserName() { | return this.userName; | } Bug seems to be related to the persistence.xml entry: <property name="hibernate.hbm2ddl.auto" value="create-drop" /> Index generation ONLY works when hibernate.hbm2ddl.auto is set to "create-drop", in any other case the index is NOT created. I'm shure, anybody understands, that 'create-drop' is not an appropriate value for production systems. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4151971#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...