> Following the example which comes with Jaybird I always receive this
> Excpetion (could you tell me why?):

Some versions of Firebird on some platforms do not like following
parameters:

dataSource.setNonStandardProperty("isc_dpb_sweep", null);
dataSource.setNonStandardProperty("isc_dpb_num_buffers", "75");

Just comment them out.

Roman