UTF8 4byte (un)escapeJava not work correctly

String bellsTest = "\ud83d\udc80\ud83d\udd14";

String value = StringEscapeUtils.escapeJava(bellsTest);
String valueTest = StringEscapeUtils.unescapeJava(value);

System.out.println(bellsTest);
System.out.println(value);
System.out.println(valueTest);

Error:
!!! bellsTest (befor) != valueTest (after escapeJava&unescapeJava)