CallableStatements: index starts at 2

It seems that in Version "8.2dev-500 JDBC 3" CallableStatements are
implemented differently from older Versions.
The index to set fields now starts at 2.

This _did_ work:
CallableStatement cS = con.prepareCall("{ call test(?)}";
cS.setString( 1, "abc" );

This _now_ works:
CallableStatement cS = con.prepareCall("{ call test(?)}";
cS.setString( 2, "abc" );

Thanks,
Thomas