Can't read grib dataset

[MTDAl]

hello, I'm trying to read grib file download from Copernicus with a java program.
every time I'm trying to read grib file, I got following exception:

`

/**
 * @param args the command line arguments
 */
public static void main(String[] args) throws IOException {
    // TODO code application logic here
    
    String path = "C:\\Users\\*****\\1980\\01\\ERA5_19800102.grib";
    
    NetcdfDataset data = NetcdfDatasets.openDataset(path, false, null);
}

`

Exception in thread "main" java.io.IOException: Cant read C:\Users\******\1980\01\ERA5_19800103.grib: not a valid CDM file. at ucar.nc2.NetcdfFile.open(NetcdfFile.java:788) at ucar.nc2.NetcdfFile.openInMemory(NetcdfFile.java:731) at ucar.nc2.NetcdfFile.openInMemory(NetcdfFile.java:749) at com.mycompany.testnetcdf.TestNetCDF.main(TestNetCDF.java:27)

what can I do from java code to have more information about this issue ? I use netcdf 5.4.2
Thanks

[JohnLCaron]

Looks like you are calling NetcdfFile.openInMemory() which doesnt work on GRIB. Call NetcdfDatasets.openDataset(), which is what your code snippet claims.

If it fails, send a sample file that it fails on.

[MTDAl]

I already use openDataset() method. You can find the file here : https://filetransfer.io/data-package/1O7kCtbm#link

[MTDAl]

Additionnal information, the java project I use link only the 4 dependencies from edu.ucar : cdm-core, httpservices, netcdf-java-plateform, udunits. Maybe should I had others?

[MTDAl]

Ok I rebuild my maven dependencies with last version ( and netcdfAll.jar ) and it seems to work. Thanks for informations JohnLCaron

[JohnLCaron]

Yes, you need grib module and its dependencies. Thats why netcdfAll worked.