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[THREDDS #OPV-470285]: TDS error I've never seen before: "spi is null, perhaps file has been closed"

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  • Subject: [THREDDS #OPV-470285]: TDS error I've never seen before: "spi is null, perhaps file has been closed"
  • Date: Wed, 16 Dec 2015 01:37:26 -0700
Hi Rich,

I've reproduced the failure, though I'm getting a different error message:
java.lang.NullPointerException
        at 
ucar.nc2.iosp.hdf5.H5tiledLayoutBB$DataChunk.getByteBuffer(H5tiledLayoutBB.java:181)
 ~[edu.ucar-cdm-4.6.4-SNAPSHOT.jar:?]

The failure is in the HDF5 IOSP, but I don't think it actually has anything to 
do with that. The next step is to reproduce with plain NetCDF-3 files.

My working hypothesis is that OpendapServlet is keeping NetcdfDataset objects 
around in memory between calls, while the NcML aggregation machinery is 
aggressively closing them in the background to save memory. Then OpendapServlet 
attempts to read from a dataset that's been closed.

Your support tickets are never easy, Rich, but often instructive.

Cheers,
Christian

Ticket Details
===================
Ticket ID: OPV-470285
Department: Support THREDDS
Priority: Normal
Status: Closed