CollationRules calls new String(String) which should be avoided.

final class CollationRules {
    final static String DEFAULTRULES = new String(
        "" // no FRENCH accent order by default, add in French Delta
        // IGNORABLES (up to first < character)
        // COMPLETELY IGNORE format characters
        + "='\u200B'=\u200C=\u200D=\u200E=\u200F"
        ...