MariaDB prepareStatement does not convert characterSet for where clause

I posted a description of this bug here:

http://stackoverflow.com/questions/26380888/mariadb-preparestatement-does-not-convert-characterset-for-where-clause

Additional Infos:
I feel this is a bug and not a feature because the insert works perfectly.
If I use the UF8 character "C2 92" ([-62, -110]) instead of the japanese character, I get the same error AND the posted workaround does not work.
Originally, this problem comes from a data replication between oracle (source) and mariaDB (destination), where it is possible that I get characters which are not assigned in latin1.