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-68e9378ce8c18083379022/] 2). Implement prespecified interfaces, as in [crayon-68e9378ce8c28729625858/] 3). Contain prespecified annotations, as in [crayon-68e9378ce8c2d010479595/] sumber: wiki 185