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Re: [netcdf-java] Getting a NetcdfFile object from a dods url

On 10/03/2011 03:37 AM, Raymond Cramer wrote:

I am having a similar problem. From a browser I can return ASCII data, so the
OPeNDAP is working.
http://...../thredds/dodsC/vault/..._cf.nc.ascii?crs,depth[3599:1:3719][19199:1:19319]

If I try to access this through code, using http my log file fills up with
msgs which suggests I can't use http (or something else needs setting ;-)):
I believe that the only way to do this via the Java API is to open the unconstrained URL (http://...../thredds/dodsC/vault/..._cf.nc) and then use the API to request the hyperslab you want rather than trying to open the constrained URL. 

Roland


Exception
http://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]
java.lang.IllegalArgumentException: Invalid uri
'http://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]':
Invalid query
        at
org.apache.commons.httpclient.HttpMethodBase.<init>(HttpMethodBase.java:222)
        at
org.apache.commons.httpclient.methods.HeadMethod.<init>(HeadMethod.java:94)
        at
ucar.unidata.io.http.HTTPRandomAccessFile.<init>(HTTPRandomAccessFile.java:92)
        at
ucar.unidata.io.http.HTTPRandomAccessFile.<init>(HTTPRandomAccessFile.java:78)
        at ucar.nc2.NetcdfFile.getRaf(NetcdfFile.java:300)
        at ucar.nc2.NetcdfFile.open(NetcdfFile.java:281)
        at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:335)
        at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:280)
        ...

If I try to use dods, I get a lot more msgs, it accesses the file, outputs
the header data but fails on the data (when the call becomes http again for
the DAS?):

[org.apache.commons.httpclient.HttpMethodBase] Resorting to protocol version
default close connection policy
[org.apache.commons.httpclient.HttpMethodBase] Should NOT close connection,
using HTTP/1.1
[org.apache.commons.httpclient.HttpConnection] enter
HttpConnection.isResponseAvailable()
[org.apache.commons.httpclient.HttpConnection] enter
HttpConnection.releaseConnection()
[org.apache.commons.httpclient.HttpConnection] Releasing connection back to
connection manager.
[org.apache.commons.httpclient.MultiThreadedHttpConnectionManager] enter
HttpConnectionManager.releaseConnection(HttpConnection)
[org.apache.commons.httpclient.MultiThreadedHttpConnectionManager] Freeing
connection, hostConfig=HostConfiguration[host=http://....:8080]
[org.apache.commons.httpclient.MultiThreadedHttpConnectionManager] enter
HttpConnectionManager.ConnectionPool.getHostPool(HostConfiguration)
[org.apache.commons.httpclient.util.IdleConnectionHandler] Adding connection
at: ........
[org.apache.commons.httpclient.MultiThreadedHttpConnectionManager] Notifying
no-one, there are no waiting threads
[ucar.nc2.dods.DODSNetcdfFile] DODSNetcdfFile
dods://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]
java.lang.IllegalArgumentException: Invalid uri
'http://....:8080/thredds/dodsC/vault/...._cf.nc.das?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]':
Invalid query
        at
org.apache.commons.httpclient.HttpMethodBase.<init>(HttpMethodBase.java:222)
        at
org.apache.commons.httpclient.methods.GetMethod.<init>(GetMethod.java:89)
        at opendap.dap.DConnect2.openConnection(DConnect2.java:205)
        at opendap.dap.DConnect2.getDAS(DConnect2.java:399)
        at ucar.nc2.dods.DODSNetcdfFile.<init>(DODSNetcdfFile.java:186)
        at ucar.nc2.dataset.NetcdfDataset.openDODS(NetcdfDataset.java:379)
        at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:316)
        at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:280)
       .....
ERROR [uk.ac.bodc.Netcdf_Utils] trying to open
dods://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]
java.io.FileNotFoundException: Cant open
dods://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]
or as DODS
dods://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]
Invalid uri
'http://....:8080/thredds/dodsC/vault/...._cf.nc.das?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]':
Invalid query
        at ucar.nc2.dataset.NetcdfDataset.openDODS(NetcdfDataset.java:381)
        at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:316)
        at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:280)
       ....

I am accessing this through inFile = NetcdfDataset.openFile(inFileName,
null);

I hope I haven't broken any rules for the length of this msg, hopefully
there's sufficient info that someone recognises the problem.

--
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