question: public static boolean safeNavigationOperatorDefined ( String nestedFieldName ) { if ( nestedFieldName . contains ( SAFE_NAVIGATION_OPERATOR ) ) if ( ! nestedFieldName . startsWith ( SAFE_NAVIGATION_OPERATOR ) ) throw new MappingException ( "Safe navigation operator must be the first symbol after dot notation" ) ; else return true ; return false ; }
target:  It checks the presence of the elvis operator and how it is used.