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-69ecd162b0db4761599796/] 2). Implement prespecified interfaces, as in [crayon-69ecd162b0dc2067426474/] 3). Contain prespecified annotations, as in [crayon-69ecd162b0dc7466935680/] sumber: wiki 185