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-67f415bfc8b6f868485821/] 2). Implement prespecified interfaces, as in [crayon-67f415bfc8b83406215087/] 3). Contain prespecified annotations, as in [crayon-67f415bfc8b98168091297/] sumber: wiki 185