private static Map<String, Function<DittoHeaders, String>> createDefaultReplacementDefinitions() { final Map<String, Function<DittoHeaders, String>> defaultReplacementDefinitions = new LinkedHashMap<>(); defaultReplacementDefinitions.put(SubjectIdReplacementDefinition.REPLACER_NAME, SubjectIdReplacementDefinition.getInstance()); defaultReplacementDefinitions.put(SubjectIdReplacementDefinition.LEGACY_REPLACER_NAME, SubjectIdReplacementDefinition.getInstance()); return Collections.unmodifiableMap(defaultReplacementDefinitions); }