StringBuffer is used in some local variables. The newer StringBuilder alternative will improve the performance slightly in such cases.

E.g.in FileNamePattern

public String convert(Object o) {
Converter<Object> p = headTokenConverter;
StringBuffer buf = new StringBuffer();
while (p != null)

{ buf.append(p.convert(o)); p = p.getNext(); }

return buf.toString();
}

should change to use

StringBuilder buf = new StringBuilder();