[thredds] java.lang.NullPointerException: Name is null

• To: Jon Blower <j.d.blower@xxxxxxxxxxxxx>
• Subject: [thredds] java.lang.NullPointerException: Name is null
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Sat, 10 Jul 2010 09:33:58 -0600

readCatalog(): Exception on 
catalog=/usr/local/tomcat/content/thredds/idd/atm_mod.xml Name is null
log=null catalog
java.lang.NullPointerException: Name is null


I havent been able to figure out where this is coming from. If anyone sees it 
again, send me the full stack trace. thanks.


Jon Blower wrote:

Hi John,

Would you be happy to send me (or the list) the relevant fragment of
your TDS catalog that works in 4.2?  I've seen exactly the same error
trying to override the units for a particular variable in an FMRC
aggregation and I'd be very interested to understand your workaround.

Cheers, Jon

-----Original Message-----
Date: Fri, 18 Jun 2010 09:21:17 -1000
From: "John Maurer, IV" <jmaurer@xxxxxxxxxx>
To: thredds@xxxxxxxxxxxxxxxx
Subject: Re: [thredds] TDS 4.2 FMRC catalogInit error: Name is null
Message-ID: <fb7ec9b949f72.4c1b3a8d@xxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"

Hi All,
Here is a brief follow-up on some new progress I've made on this
problem:

Because of the error from TDS 4.2, I have returned to TDS 4.1 for now
but at least found a workaround for the _FillValue mismatch. Because
FMRC is returning NaN for _FillValue, I have set this to NaN with NcML
in my TDS config file for these datasets. As I stated below, this was
not working for me at first because I was making the modification within
the aggregation tag. Placing this modification prior to the aggregation
tag instead now gives me the expected results: the metadata on the TDS
OPeNDAP page and the OPeNDAP output now both have NaN for _FillValue so
there is no longer a mismatch causing errors for me in visualization
applications such as LAS.

Cheers,
John Maurer
Hawaii Ocean Observing System (HiOOS)

----- Original Message -----
From: "John Maurer, IV" <jmaurer@xxxxxxxxxx>
Date: Thursday, June 17, 2010 4:10 pm
Subject: TDS 4.2 FMRC catalogInit error: Name is null
To: thredds@xxxxxxxxxxxxxxxx

Hi All,
I'm working with the latest development release of TDS (4.2) in order

to take advantage of the FMRC refactor. However, I get an error for each
of my FMRC datasets in my TDS catalogInit.log that says something like
the following:

readCatalog(): Exception on

catalog=/usr/local/tomcat/content/thredds/idd/atm_mod.xml Name is null

 log=null catalog
java.lang.NullPointerException: Name is null

I do not see where "Name" is supposed to be used in the documentation,

and I already have lower-case "name" settings in place. Any ideas what's
going on here? I realize this is not a stable release yet, so my
apologies if I'm jumping the gun. Here is the URL to our THREDDS
catalog:

http://oos.soest.hawaii.edu/thredds/catalog.html

Go to "Ocean Model Output" or "Atmosphere Model Output" and you will

get an HTTP Status 404 - Not Found that results from this problem.

A little background on why I care:

Because of the way FMRC used to work, I am getting NaN for _FillValue

in my Best Time Series even though the source NetCDF dataset files have
_FillValue set to 1.0E37 in their metadata. This discrepency is causing
problems when displaying my data in LAS 7.1.1: the metadata say one
thing, but TDS delivers another. I have tried using NcML to get the two
in sync but without any success. From my understanding in talking with
others, this is a known bug in TDS that will be fixed in 4.2. I have
converted all my FMRC catalogs from the old datasetScan syntax to the
new featureCollection syntax as described here:
http://www.unidata.ucar.edu/projects/THREDDS/tech/tds4.2/reference/colle
ctions/FeatureCollections.html. I have attached one example.

Thanks for your time!
Cheers,
John Maurer

Hawaii Ocean Observing System (HiOOS)

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• Follow-Ups:
  • Re: [thredds] java.lang.NullPointerException: Name is null
    • From: Jon Blower

• References:
  • Re: [thredds] TDS 4.2 FMRC catalogInit error: Name is null (John Maurer, IV)
    • From: Jon Blower