question: gets the value of the key property . this accessor method returns a reference to the live list , not a snapshot . therefore any modification you make to the returned list will be present inside the jaxb object . this is why there is not a set method for the key property . for example , to add a new item , do as follows : getkey . add newitem ; objects of the following type s are allowed in the list objectkey concode_field_sep BigInteger sequenceNumber concode_elem_sep List<NotificationCriteria> notificationCriteria concode_elem_sep long serialVersionUID concode_elem_sep String id concode_elem_sep String relationshipCode concode_elem_sep List<NotificationTemplate> notificationTemplate concode_elem_sep List<Classification> classification concode_elem_sep List<ObjectKey> key concode_elem_sep List<SpecificationGroup> characteristic concode_elem_sep Status status concode_field_sep BigInteger getSequenceNumber concode_elem_sep List<NotificationCriteria> getNotificationCriteria concode_elem_sep void setRelationshipCode concode_elem_sep void setSequenceNumber concode_elem_sep void setId concode_elem_sep String getId concode_elem_sep Status getStatus concode_elem_sep List<SpecificationGroup> getCharacteristic concode_elem_sep String getRelationshipCode concode_elem_sep void setStatus concode_elem_sep List<NotificationTemplate> getNotificationTemplate concode_elem_sep List<Classification> getClassification
target: List < ObjectKey > function ( ) { if ( key == null ) { key = new ArrayList < ObjectKey > ( ) ; } return this . key ; }