Re: NullPointerException during aggregation

• To: "John Caron" <caron@xxxxxxxxxxxxxxxx>
• Subject: Re: NullPointerException during aggregation
• From: "Jon Blower" <jdb@xxxxxxxxxxxxxxxxxxxx>
• Date: Tue, 7 Nov 2006 08:28:02 +0000

Hi John,

Yes, this problem is still evident in 2.2.17 (I downloaded the
toolsUI-2.2.17.jar file).

Thanks, Jon

On 03/11/06, John Caron <caron@xxxxxxxxxxxxxxxx> wrote:

Hi Jon:

Can you check if you get the same error in the latest 2.2.17 release?
I have fixed some bugs in aggregation, but im not sure if thats one of them.

thanks

Jon Blower wrote:
> Hi all,
>
> I'm having problems working with NcML aggregations and the 2.2.16
> version of the Java NetCDF libraries.  I would like to aggregate
> files:
>
> NATL_1_28082006.nc
> NATL_1_29082006.nc
> NATL_1_30082006.nc
> ...
>
> along the time dimension.  I tried an NcML file like this:
>
> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
>   <aggregation dimName="time" type="joinNew">
>     <variableAgg name="temperature"/>
>     <variableAgg name="salinity"/>
>     <scan location="/path/to/files/" suffix=".nc"
> dateFormatMark="NATL_1_#ddMMyyyy" />
>   </aggregation>
> </netcdf>
>
> This gave me a NullPointerException:
>
> java.lang.NullPointerException
>     java.util.Calendar.setTime(Calendar.java:1032)
>     java.text.SimpleDateFormat.format(SimpleDateFormat.java:785)
>     java.text.SimpleDateFormat.format(SimpleDateFormat.java:778)
>     java.text.DateFormat.format(DateFormat.java:314)
>     ucar.nc2.units.DateFormatter.toDateTimeStringISO(DateFormatter.java:184)
>
>     ucar.nc2.ncml.Aggregation.crawlDirectory(Aggregation.java:817)
>
> I think I know why this is.  There are other files in the same
> directory of the form "NATL_120_28082006.nc" and I think the
> aggregator is trying to match these.  Can I arrange it so that only
> files that match the pattern "NATL_1_#ddMMyyyy.nc" are aggregated, and
> all others are simply ignored?
>
> I am reluctant to change the directory structure of my data because
> other applications may depend on it.
>
> Thanks in advance,
> Jon
>

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