I tried to use the follwoing command "update -A -kb test.doc" to update the 
sticky kopts, but the Update Command delivers an error:

Illegal argument: null

Debugging showed that the -kb switch is transfered to '??'
Further analysis showed that the getOptString has no k Option in the 
getOptString method

    public String getOptString()
    {
        return "RCldPAfD:r:pj:";
    }

the cvs.exe tool shows that the -k option is allowed for update.

Usage: cvs update [-APdflRp] [-k kopt] [-r rev|-D date] [-j rev]
    [-I ign] [-W spec] [files...]
        -A      Reset any sticky tags/date/kopts.
        -P      Prune empty directories.
        -C      Overwrite locally modified files with clean repository copies.
        -d      Build directories, like checkout does.
        -f      Force a head revision match if tag/date not found.
        -l      Local directory only, no recursion.
        -R      Process directories recursively.
        -p      Send updates to standard output (avoids stickiness).
        -k kopt Use RCS kopt -k option on checkout.
        -r rev  Update using specified revision/tag (is sticky).
        -D date Set date to update from (is sticky).
        -j rev  Merge in changes made between current revision and rev.
        -I ign  More files to ignore (! to reset).
        -W spec Wrappers specification line.