returns the single instance of this class . will create one if none exists . concode_field_sep String NOBODY concode_elem_sep NullPrincipal INSTANCE concode_elem_sep long serialVersionUID concode_elem_sep Map<String,Object> attributes concode_field_sep Map<String,Object> getAttributes concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep String getId
NullPrincipal function ( ) { if ( INSTANCE == null ) { INSTANCE = new NullPrincipal ( ) ; } return INSTANCE ; }