ContentType.java

@Target({TYPE,ANNOTATION_TYPE}) 
@Retention(RUNTIME)
@Constraint(validatedBy = ContentTypeMultipartFileValidator.class)
@Documented
public @interface ContentType {
 
    String message() default "Please upload  jpg, png or gif and less than 5MB in size";
 
    Class<?>[] groups() default {};
 
    Class<? extends Payload>[] payload() default {};
 
     String[] value();
}