Re: NullPointerException during aggregation

Hi,

As a follow-up question, should it be possible to use the regExp
option in the <scan> element to only attempt to match filenames that
match a given regular expression?  I tried to do this with the example
below, i.e.:

<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" regExp="NATL"
dateFormatMark="NATL_1_#ddMMyyyy" />
  </aggregation>
</netcdf>

but it gave a different NullPointerException (in
AggregationNew.java:51, version 2.2.17), which seems to be because the
aggregation is not picking up any files at all.  Should regexps work
with joinNew?

Thanks, Jon


On 07/11/06, Jon Blower <address@hidden> wrote:
> 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 <address@hidden> 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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>
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> --------------------------------------------------------------
> Dr Jon Blower              Tel: +44 118 378 5213 (direct line)
> Technical Director         Tel: +44 118 378 8741 (ESSC)
> Reading e-Science Centre   Fax: +44 118 378 6413
> ESSC                       Email: address@hidden
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--
--------------------------------------------------------------
Dr Jon Blower              Tel: +44 118 378 5213 (direct line)
Technical Director         Tel: +44 118 378 8741 (ESSC)
Reading e-Science Centre   Fax: +44 118 378 6413
ESSC                       Email: address@hidden
University of Reading
3 Earley Gate
Reading RG6 6AL, UK
--------------------------------------------------------------

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