The Grib Java decoder is used in conjunction with netcdf-java library to
convert some or all of the Grib1 or Grib2 data into netCDF files.

In the netcdf-java library, there is a Grib2Netcdf decoder:

To used the Grib2Netcdf decoder download the toolsUI jar file from the netCDF java page:

http://www.unidata.ucar.edu/software/netcdf-java/

The toolsUI jar file contains all the code necessary to do the conversion to netCDF.
One can create a shell script similar to the one below to do the conversion from 
Grib to a netCDF file.  The $CP variable needs to be set by you to where the 
toolsUI-<version number>.jar is located. Replace <your path too> with your own
path and update the version number of the toolsUI jar file to the one on the
downloaded jar file.



#/bin/csh -f
# the shell csh must use the -f flag
#
set CP="<your path too>toolsUI-<version number>.jar"

echo "java -classpath $CP ucar.nc2.ui.ToolsUI"

java -Xmx512m -classpath $CP ucar.nc2.iosp.grib.Grib2Netcdf <INPUT> <OUTPUT.NC>


Don't forget to add the INPUT grib file and OUTPUT.NC names.

One can also run the ToolsUI program by replacing the Grib2Netcdf line with
the following line:

java -Xmx512m -classpath $CP ucar.nc2.ui.ToolsUI


The ToolsUI program will permit one to look at the data on a parameter basis verses
converting the whole file to netCDF.