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
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