Ideally speaking, a POJO is a Java object not bound by any restriction other than those forced by the Java Language Specification; i.e. a POJO should not have to 1). Extend prespecified classes, as in [crayon-6a63f7703fe17948429082/] 2). Implement prespecified interfaces, as in [crayon-6a63f7703fe30958232760/] 3). Contain prespecified annotations, as in [crayon-6a63f7703fe34982987677/] sumber: wiki 185