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-69254cd05a653192485458/] 2). Implement prespecified interfaces, as in [crayon-69254cd05a660020893431/] 3). Contain prespecified annotations, as in [crayon-69254cd05a665360920873/] sumber: wiki 185