[thredds] remote NcML "union" aggregation broken in TDS 4.3?

To: THREDDS Users <thredds@xxxxxxxxxxxxxxxx>
Subject: [thredds] remote NcML "union" aggregation broken in TDS 4.3?
From: John Maurer <jmaurer@xxxxxxxxxx>
Date: Fri, 19 Apr 2013 10:35:40 -1000
Hi all,
I'm attempting to do an NcML "union" aggregation of several variables from
a forecast model that are contained in separate remote OPeNDAP locations.
While this works in TDS 4.2 (and Tools UI 4.2), I'm getting an error in TDS
4.3.16 (and Tools UI 4.3). Below are the details. Perhaps this is related
to the recent "joinExisting" remote aggregation problem that Roland
Schweitzer reported in TDS 4.3 here:
https://www.unidata.ucar.edu/mailing_lists/archives/thredds/2013/msg00093.html.
I have already tried clearing the cache and restarting Tomcat as was
suggested in that chain: also did not solve the problem in my case, either.
Thanks in advance for your help on this.
Cheers,
John Maurer
Pacific Islands Ocean Observing System (PacIOOS)
University of Hawaii at Manoa

TDS catalog:

<?xml version="1.0" encoding="UTF-8" ?>

<catalog name="HYCOM Global Ocean Model"
         xmlns="
http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0";
         xmlns:xlink="http://www.w3.org/1999/xlink"; >

  <service name="gridServices" serviceType="Compound" base="">
    <service name="opendap" serviceType="OpenDAP"
base="/thredds/dodsC/"     />
    <service name="ncss"    serviceType="NetcdfSubset"
base="/thredds/ncss/grid/" />
    <service name="wms"     serviceType="WMS"
base="/thredds/wms/"       />
    <service name="wcs"     serviceType="WCS"
base="/thredds/wcs/"       />
    <service name="iso"     serviceType="ISO"
base="/thredds/iso/"       />
    <service name="ncml"    serviceType="NCML"
base="/thredds/ncml/"      />
  </service>

  <dataset name="HYCOM Global Ocean Model"
           ID="hycom_global"
           urlPath="hycom_global">

    <metadata inherited="true">
      <serviceName>gridServices</
serviceName>
      <dataType>Grid</dataType>
    </metadata>

    <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
      <attribute name="title" value="HYCOM test: temp and salinity union"/>

      <aggregation type="union">
        <netcdf location="dods://
apdrc.soest.hawaii.edu:80/dods/public_data/Model_output/HYCOM/global/hycomT
"/>
        <netcdf location="dods://
apdrc.soest.hawaii.edu:80/dods/public_data/Model_output/HYCOM/global/hycomS
"/>
      </aggregation>
    </netcdf>

  </dataset>

</catalog>


threddsServlet.log:

2013-04-19T09:29:09.165 -1000 [   1119756][       8] INFO  - threddsServlet
- Remote host: 128.171.151.240 - Request: "GET /thredds-test/dodsC/hycom_
global_temp.html HTTP/1.1"
2013-04-19T09:29:09.328 -1000 [   1119919][       8] ERROR -
thredds.server.opendap.OpendapServlet - path= /hycom_global_temp.html
java.lang.NullPointerException
        at ucar.nc2.util.URLnaming.resolveFile(URLnaming.java:238)
        at ucar.nc2.ncml.NcMLReader.readAgg(NcMLReader.java:1348)
        at ucar.nc2.ncml.NcMLReader.readNetcdf(NcMLReader.java:491)
        at ucar.nc2.ncml.NcMLReader.readNcML(NcMLReader.java:438)
        at ucar.nc2.ncml.NcMLReader.readNcML(NcMLReader.java:351)
        at
thredds.servlet.DatasetHandler$NcmlFileFactory.open(DatasetHandler.java:261)
        at
thredds.servlet.DatasetHandler$NcmlFileFactory.open(DatasetHandler.java:252)
        at ucar.nc2.util.cache.FileCache.acquire(FileCache.java:224)
        at
ucar.nc2.dataset.NetcdfDataset.openOrAcquireFile(NetcdfDataset.java:685)
        at
ucar.nc2.dataset.NetcdfDataset.acquireFile(NetcdfDataset.java:622)
        at
thredds.servlet.DatasetHandler.getNetcdfFile(DatasetHandler.java:158)
        at
thredds.server.opendap.OpendapServlet.getDataset(OpendapServlet.java:913)
        at
thredds.server.opendap.OpendapServlet.doGetHTML(OpendapServlet.java:613)
        at
thredds.server.opendap.OpendapServlet.doGet(OpendapServlet.java:230)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at
thredds.servlet.filter.CookieFilter.doFilter(CookieFilter.java:54)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at
thredds.servlet.filter.RequestQueryFilter.doFilter(RequestQueryFilter.java:120)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at
thredds.servlet.filter.RequestPathFilter.doFilter(RequestPathFilter.java:102)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at
thredds.server.RequestBracketingLogMessageFilter.doFilter(RequestBracketingLogMessageFilter.java:48)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
        at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
        at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
        at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
        at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
        at java.lang.Thread.run(Unknown Source)
2013-04-19T09:29:09.331 -1000 [   1119922][       8] INFO  - threddsServlet
- Request Completed - 500 - -1 - 166
Follow-Ups:
- Re: [thredds] remote NcML "union" aggregation broken in TDS 4.3?
  - From: John Caron
- Re: [thredds] remote NcML "union" aggregation broken in TDS 4.3?
  - From: John Maurer
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