John,
Thanks a lot. The problem was the "core libray" (netcdf.jar) was missing!
I was thinking that I would need only the netcdfAll.jar
<ftp://ftp.unidata.ucar.edu/pub/netcdf-java/v2.1/netcdfAll.jar> file
because in the web is written : "This includes the core library, the
OpenDAP client, and the *ucar.nc2.dataset* and its subpackages". So,
I've got the following files: netcdfAll.jar, the units.jar and the
jdom.jar. I was thinking that nectcdf.jar had been included in
netcdfAll.jar as is written in the text.
Sorry, and thanks for your patience
Viviane