Hi Nathan, Dan,
I was just looking at this (John forwarded me a note from Dan). I'm not
seeing the NullPointerException but I am seeing some problems with
encoding of the "+" in URLs. What are you doing when you get the
NullPointerException?
Ethan
Nathan Potter wrote:
Ethan and John,
We are having a problem with (what we think is) a (valid) THREDDS
catalog entry causing the THREDDS code to throw a null pointer
exception in. (See the included emails for the background.)
The catalog entry is:
<dataset name="CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol"
urlPath="wcs/DataFed/NetCDF/CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol"
ID="wcs/DataFed/NetCDF/CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol" >
<property name="wcs-request"
value="http://webapps.datafed.net/ogc_NASA.wsfl?SERVICE=WCS&REQUEST=GetCoverage&VERSION=1.0.0&CRS=EPSG:4326&COVERAGE=GOCART_G_OL.CCEXTTAU&TIME=2007-06-24T23:00:00&BBOX=-180,-90,180,90,0,0&WIDTH=-1&HEIGHT=-1&DEPTH=-1&FORMAT=NetCDF";
/>
<property name="returnType" value="netCDF" />
<property name="cacheTime" value="600" />
<serviceName>OPeNDAP-Hyrax</serviceName>
</dataset>
The stack trace that I get is:
java.lang.NullPointerException
at
thredds.servlet.CatalogServicesServlet.handleCatalogServiceRequest(CatalogServicesServlet.java:226)
at
thredds.servlet.DataRootHandler.processReqForCatalog(DataRootHandler.java:1117)
at
opendap.bes.ThreddsDispatchHandler.handleRequest(ThreddsDispatchHandler.java:232)
at
opendap.coreServlet.DispatchServlet.doGet(DispatchServlet.java:437)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
And it appears to a problem ONLY when there is a plus sign ("+") in
the value of the ID attribute.
Any ideas?
N
Begin forwarded message:
From: Daniel Holloway <d.holloway@xxxxxxxxxxx>
Date: October 23, 2007 11:01:37 AM PDT
To: Nathan Potter <ndp@xxxxxxxxxxx>
Subject: Re: XML question for WCS THREDDS catalogs
On Oct 23, 2007, at 1:53 PM, Nathan Potter wrote:
On Oct 23, 2007, at 10:01 AM, Daniel Holloway wrote:
On Oct 23, 2007, at 12:21 PM, Nathan Potter wrote:
Dan,
Several things strike me as potential problems:
1) The Exception is being thrown deep in the THREDDS code.
Disturbingly, it appears to be in a servlert implmentation that I
am not running in Hyrax. Are you running a TDS too?
Hi Nathan,
Thanks for the quick reply. No, I'm not running a TDS on this
platform as well.
2) A plus sign in a URL (outside of the constraint expression)
mught get filtered by the new security features in the PLFS, and
this would cause trouble!
It's not a big problem for me, I was more interested in knowing
where the problem existed and why. If these characters aren't
allowable in XML, or THREDDS, then I need to document that in the
configuration guide for the handler. It seems to me that these
are valid characters, or at least should be able to be replaced
with '&plus' without it causing these problems.
Anyway, welcome back and thanks for the reply.
Dan
p.s. Should we enter a ticket on this to keep track of the
problem?
I think so. I am still pretty non functional from jet lag.... I'll
be on my game tomorrow and I'll try to tack it down. Will you send
me the THREDDS catalog entry that caused the error?
Nathan,
Here's the dataset element that is causing the problem. The
best bet is to replace the element in your example catalog.xml with
this one. The problem seems to be the '+' sign in the ID attribute.
I've experimented and found that it only fails when the '+' sign is
in the ID attribute, no idea why.
--------
<dataset name="CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol"
urlPath="wcs/DataFed/NetCDF/CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol"
ID="wcs/DataFed/NetCDF/CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol" >
<property name="wcs-request"
value="http://webapps.datafed.net/ogc_NASA.wsfl?SERVICE=WCS&REQUEST=GetCoverage&VERSION=1.0.0&CRS=EPSG:4326&COVERAGE=GOCART_G_OL.CCEXTTAU&TIME=2007-06-24T23:00:00&BBOX=-180,-90,\
180,90,0,0&WIDTH=-1&HEIGHT=-1&DEPTH=-1&FORMAT=NetCDF" />
<property name="returnType" value="netCDF" />
<property name="cacheTime" value="600" />
<serviceName>OPeNDAP-Hyrax</serviceName>
</dataset>
-------
Dan
N
N
On Oct 23, 2007, at 8:52 AM, Daniel Holloway wrote:
Nathan,
I've been playing with the configuration of a Hyrax server
using the latest OLFS/BES code. There is/was a dataset that has
a '+' sign in the name. I get an error from the OLFS when using
this string in the ID attribute of the dataset element. As follows:
------
<dataset
name="CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol"
urlPath="wcs/DataFed/NetCDF/CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol"
ID="wcs/DataFed/NetCDF/CCEXTTAU-INTEX.Organic+Black.Carbon.Aerosol"
>
<property name="wcs-request"
value="http://webapps.datafed.net/ogc_NASA.wsfl?SERVICE=WCS&REQUEST=GetCoverage&VERSION=1.0.0&CRS=EPSG:4326&COVERAGE=GOCART_G_OL.CCEXTTAU&TIME=2007-06-24T23:00:00&BBOX=-180,-90,\
180,90,0,0&WIDTH=-1&HEIGHT=-1&DEPTH=-1&FORMAT=NetCDF"
/>
<property name="returnType" value="netCDF" />
<property name="cacheTime" value="600" />
<serviceName>OPeNDAP-Hyrax</serviceName>
</dataset>
-------
The error is:
-------
Error { code = -1; message = "java.lang.NullPointerException:
null [CatalogServicesServlet.java - line 226]"; };
-------
I only get an error if the '+' sign is used in the 'ID'
attribute, the others don't seem to make any difference. I've
tried replacing the '+' with a + but that breaks the
server's access to the catalog completely. Not exactly sure why
but if I use a + in the XML I get a 'Resource Not Found'
response from the server when trying to open the catalog.
Anyway, figured I'd ask before submitting a Trac ticket.
Dan
= = =
Nathan Potter ndp at opendap.org
OPeNDAP, Inc. 541.752.1852
= = =
Nathan Potter ndp at opendap.org
OPeNDAP, Inc. 541.752.1852
= = =
Nathan Potter ndp at opendap.org
OPeNDAP, Inc. 541.752.1852
--
Ethan R. Davis Telephone: (303) 497-8155
Software Engineer Fax: (303) 497-8690
UCAR Unidata Program Center E-mail: edavis@xxxxxxxx
P.O. Box 3000
Boulder, CO 80307-3000 http://www.unidata.ucar.edu/
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