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[Support #LIA-275471]: Writing a local netCDF file of a gridded data source from the Field Selector can result in a NPE. [1867]

> Hello -
> 
> I stumbled across a bug yesterday where in both McV and IDV the option of 
> right-clicking on a gridded data source in the Field Selector and choosing 
> 'Write Local Grid' results in a NPE.  We set this as a Critical priority 
> item.  See the Request of this inquiry for some step-by-step instructions on 
> how to reproduce the error.
> 
> - Bob Carp
> 

Bob,
    This bug is fixed in the latest nightly release.


Yuan
> ----==== Inquiry ====----
> 1867
> 
> ----==== Summary ====----
> Writing a local netCDF file of a gridded data source from the Field Selector 
> can result in a NPE.
> 
> ----==== Request ====----
> 2014-11-04 - Bob Carp
> This is a problem in both McV 1.5beta2 and IDV 5.0u2 nightlies.  To 
> replicate, do the following:
> 
> 1 - Add in the latest GFS CONUS 80km model run
> 2 - In the Field Selector, R-Click on the GFS CONUS Data Source and choose 
> Write Local Grid
> 3 - Select a destination and name for the netCDF file in the Save window
> 4 - In the unnamed window, select any field (or all).  For example, 'Pressure 
> @ Tropopause'.  Click OK
> 
> This results in an error:
> 
> Error writing local netcdf file.
> Data:dods://thredds.ucar.edu/thredds/dodsC/grib/NCEP/GFS/CONUS_80km/GFS_CONUS_80km_20141104_0600.grib1/GC
> Variables:[Pressure_tropopause]
> java.lang.NullPointerException
> java.lang.NullPointerException
> at 
> ucar.nc2.dt.grid.NetcdfCFWriter.writeGlobalAttributes(NetcdfCFWriter.java:751)
> at ucar.nc2.dt.grid.NetcdfCFWriter.makeOrTestSize(NetcdfCFWriter.java:302)
> at ucar.nc2.dt.grid.NetcdfCFWriter.makeFile(NetcdfCFWriter.java:190)
> at ucar.nc2.dt.grid.NetcdfCFWriter.makeFile(NetcdfCFWriter.java:172)
> at 
> ucar.unidata.data.grid.GeoGridDataSource.writeNc(GeoGridDataSource.java:922)
> at 
> ucar.unidata.data.grid.GeoGridDataSource.saveDataToLocalDisk(GeoGridDataSource.java:882)
> at 
> ucar.unidata.data.DataSourceImpl.saveDataToLocalDisk(DataSourceImpl.java:2773)
> at 
> ucar.unidata.data.DataSourceImpl.saveDataToLocalDisk(DataSourceImpl.java:2740)
> at 
> ucar.unidata.data.grid.GeoGridDataSource$1$1.run(GeoGridDataSource.java:685)
> at ucar.unidata.util.Misc$3.run(Misc.java:1243)
> 
> __________________________________________________
> * This was not a problem in McV 1.5beta1.
> * You can make this work by first displaying the 'Pressure @ Tropopause' 
> field and then follow steps 2-4 above.
> * The Export Grid/Image To NetCDF formula doesn't show this error, but the 
> data is displayed
> * Once you display the data, saving the display as NetCDF through File > 
> Save in the Layer Controls doesn't show this error
> 
> 
> ################################################################################
> 
> http://mcidas.ssec.wisc.edu/inquiry-v/index.php?inquiry=1867
> 
> 


Ticket Details
===================
Ticket ID: LIA-275471
Department: Support IDV
Priority: Normal
Status: Closed