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-6a2884ee6c066265697194/] 2). Implement prespecified interfaces, as in [crayon-6a2884ee6c077160662189/] 3). Contain prespecified annotations, as in [crayon-6a2884ee6c07b802008233/] sumber: wiki 185