Hi José,
Sorry for the late response—hopefully this is still useful to you.
Writing structures to NetCDF-4 is a recent addition to our library and
hasn't been tested as comprehensively as we'd like, especially since most
of our users that are writing NetCDF-4 are only utilizing the classic data
model (i.e. no structures). Your example uncovered multiple bugs [1][2][3],
so thank you for that!
That said, it is still possible to make your example work, although the
admittedly limited documentation makes it tricky to get right. I've
corrected your NetCdfCreatorLite2 class and posted it here [4]. Notice that
the "Other" dimension is no longer unlimited and that I'm recalculating the
structure's size after adding members to it.
Also, for future reference, the latest versions of our library artifacts
are not available on Maven Central. Instead, grab them from our
organization's repository, as described here [5].
Cheers,
Christian
[1] https://github.com/Unidata/thredds/issues/296
[2] https://github.com/Unidata/thredds/issues/298
[3] https://github.com/Unidata/thredds/issues/299
[4] https://gist.github.com/cwardgar/7aa866886468e97c8eea
[5]
https://www.unidata.ucar.edu/software/thredds/current/netcdf-java/reference/BuildDependencies.html
On Thu, Nov 5, 2015 at 8:01 AM, José Évora <jose.evora@xxxxxxxx> wrote:
> The dependency is being taken from Maven central. However, I have tried
> this jar instead of maven:
>
> ftp://ftp.unidata.ucar.edu/pub/netcdf-java/v4.6/netcdfAll-4.6.jar
>
> And I get exactly the same problems in both java files.
>
> José Évora Gómez
> Instituto Universitario SIANI
> Universidad de Las Palmas de GC
> @j_evora
>
> 2015-11-05 14:09 GMT+00:00 John Caron <jcaron1129@xxxxxxxxx>:
>
>> what repo is
>>
>> <dependency>
>> <groupId>edu.ucar</groupId>
>> <artifactId>netcdf4</artifactId>
>> <version>LATEST</version>
>> </dependency>
>>
>> coming from?
>>
>>
>>
>> On Thu, Nov 5, 2015 at 12:13 AM, José Évora <jose.evora@xxxxxxxx> wrote:
>>
>>> When maven resolves the code quoted, this is the library that downloads:
>>>
>>> Maven: edu.ucar:netcdf4:4.5.5
>>>
>>>
>>> Version seems to be 4.5.5 for the netcdf java library. For the netcdf C
>>> libraries, I downloaded and installed: netCDF 4.3.3.1. Specifically, this
>>> file:
>>>
>>>
>>> http://www.unidata.ucar.edu/downloads/netcdf/ftp/netCDF4.3.3.1-NC4-DAP-64.exe
>>>
>>> Thanks,
>>>
>>> José Évora Gómez
>>> Instituto Universitario SIANI
>>> Universidad de Las Palmas de GC
>>> @j_evora
>>>
>>> 2015-11-04 23:33 GMT+00:00 John Caron <jcaron1129@xxxxxxxxx>:
>>>
>>>> Hi Jose, what version of netcdf-java and netcdf C libraries are you
>>>> using? John
>>>>
>>>> On Wed, Nov 4, 2015 at 12:54 AM, José Évora <jose.evora@xxxxxxxx>
>>>> wrote:
>>>>
>>>>> Hi everyone,
>>>>>
>>>>> I'm trying to create a structure (also know compounded type). In this
>>>>> email I attach two different ways I've tried to do it and their respective
>>>>> error message. This is the dependency I'm using
>>>>>
>>>>> <dependency>
>>>>>> <groupId>edu.ucar</groupId>
>>>>>> <artifactId>netcdf4</artifactId>
>>>>>> <version>LATEST</version>
>>>>>> </dependency>
>>>>>
>>>>>
>>>>> *1) NetCdfCreatorLite.java*
>>>>>
>>>>> The execution throws a NullPointerException at
>>>>>
>>>>> Structure otherVar = ncFile.addStructure(root,
>>>>>> root.getParentStructure(), "Other", singletonList(other));
>>>>>
>>>>>
>>>>> Exception in thread "main" java.lang.NullPointerException
>>>>>> at ucar.nc2.NetcdfFileWriter.addStructure(NetcdfFileWriter.java:584)
>>>>>> at org.mock.NetCdfCreatorLite.main(NetCdfCreatorLite.java:27)
>>>>>
>>>>>
>>>>> *2) NetCdfCreatorLite2.java*
>>>>>
>>>>> According to the java doc, the method addstructure shouldn't be used.
>>>>> Then, in this second version, I uses a addVariable method to create the
>>>>> structure:
>>>>>
>>>>> Structure otherVar = (Structure) ncFile.addVariable(root, "Other",
>>>>>> STRUCTURE, singletonList(other));
>>>>>
>>>>>
>>>>> The exeception given this time is:
>>>>>
>>>>> Exception in thread "main" java.io.IOException: nc_put_vars: -49:
>>>>>> NetCDF: Variable not found grpid=65536 objid=1
>>>>>> at ucar.nc2.jni.netcdf.Nc4Iosp.writeCompoundData(Nc4Iosp.java:2895)
>>>>>> at ucar.nc2.jni.netcdf.Nc4Iosp.writeData(Nc4Iosp.java:2839)
>>>>>> at ucar.nc2.jni.netcdf.Nc4Iosp.writeData(Nc4Iosp.java:2721)
>>>>>> at ucar.nc2.NetcdfFileWriter.write(NetcdfFileWriter.java:934)
>>>>>> at ucar.nc2.NetcdfFileWriter.write(NetcdfFileWriter.java:918)
>>>>>> at org.mock.NetCdfCreatorLite2.main(NetCdfCreatorLite2.java:46)
>>>>>
>>>>>
>>>>> At line:
>>>>>
>>>>> ncFile.write(otherVar, otherStructure);
>>>>>
>>>>>
>>>>> If I comment the creation of structures, the application executes
>>>>> perfectly. Even more, by only adding the addVariable of a structure line,
>>>>> I
>>>>> get this exception, even though I only write the cityVar at line 50.
>>>>>
>>>>> What is wrong? Can you please provide me with an example of use of the
>>>>> structures?.
>>>>>
>>>>> Best regards, thank you very much,
>>>>>
>>>>> José Évora Gómez
>>>>> Instituto Universitario SIANI
>>>>> Universidad de Las Palmas de GC
>>>>> @j_evora
>>>>>
>>>>> _______________________________________________
>>>>> netcdf-java mailing list
>>>>> netcdf-java@xxxxxxxxxxxxxxxx
>>>>> For list information or to unsubscribe, visit:
>>>>> http://www.unidata.ucar.edu/mailing_lists/
>>>>>
>>>>
>>>>
>>>
>>
>
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