Re: [netcdf-java] NPE when reading Grid Variable

• To: Aaron Braeckel <braeckel@xxxxxxxx>
• Subject: Re: [netcdf-java] NPE when reading Grid Variable
• From: John Caron <caron@xxxxxxxx>
• Date: Wed, 18 Mar 2015 09:09:48 -0600

HI Aaron: Im seeing the problem with that file, seems to be in the dark
matter of JJ2000 library. I will investigate asap. John

On Tue, Mar 17, 2015 at 5:24 PM, Aaron Braeckel <braeckel@xxxxxxxx> wrote:

> Hello,
>
> with 4.5.5 and 4.6.0-SNAPSHOT when I read a GRIB file and call
> Variable.read() I get a NullPointerException.  I've placed a copy of my
> file at http://www.ral.ucar.edu/~braeckel/pgbh02.gdas.CLWMR.975mbar.grb2.
> Here is my code:
>
> GridDataset dataset = null;
>
> try {
>   dataset = GridDataset.open( "pgbh02.gdas.CLWMR.975mbar.grb2");
>   System.out.println( "Opened "+dataset);
>   for( GridDatatype grid : dataset.getGrids() ){
>     Variable v = grid.getVariable();
>     Array a = v.read();
>     System.out.println("Read data for "+grid.getName());
>   }
> } catch( IOException e ) {
>   e.printStackTrace();
> }
>
> if( dataset!=null)
>   dataset.close();
>
> This results in the following NPE (this is 4.6.0-SNAPSHOT):
>
> Exception in thread "main" java.lang.NullPointerException
>     at
> ucar.nc2.grib.grib2.Grib2DataReader2.getData40(Grib2DataReader2.java:756)
>     at
> ucar.nc2.grib.grib2.Grib2DataReader2.getData(Grib2DataReader2.java:117)
>     at ucar.nc2.grib.grib2.Grib2Record.readData(Grib2Record.java:327)
>     at ucar.nc2.grib.collection.Grib2Iosp.readData(Grib2Iosp.java:470)
>     at
> ucar.nc2.grib.collection.GribIosp$DataReader.read(GribIosp.java:1013)
>     at
> ucar.nc2.grib.collection.GribIosp.readDataFromCollection(GribIosp.java:935)
>     at ucar.nc2.grib.collection.GribIosp.readData(GribIosp.java:880)
>     at ucar.nc2.NetcdfFile.readData(NetcdfFile.java:1980)
>     at ucar.nc2.Variable.reallyRead(Variable.java:868)
>     at ucar.nc2.Variable._read(Variable.java:839)
>     at ucar.nc2.Variable.read(Variable.java:717)
>     at ucar.nc2.dataset.VariableDS.reallyRead(VariableDS.java:523)
>     at ucar.nc2.dataset.VariableDS._read(VariableDS.java:507)
>     at ucar.nc2.Variable.read(Variable.java:717)
>
> Have you seen this before?
> Aaron
>
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• References:
  • [netcdf-java] NPE when reading Grid Variable
    • From: Aaron Braeckel