Re: [netcdf-java] NoClassDefFoundError in NetcdfFile.canOpen(String)

• To: Martin Desruisseaux <martin.desruisseaux@xxxxxxxxxxx>
• Subject: Re: [netcdf-java] NoClassDefFoundError in NetcdfFile.canOpen(String)
• From: Don Murray <dmurray@xxxxxxxxxxxxxxxx>
• Date: Fri, 29 Jan 2010 10:02:00 -0700

Hi Martin-

Don


Martin Desruisseaux wrote:

Hello all

I'm using the NetCDF library version 4.1 without the visadNoDods.jar file (this dependency is big! 4.3Mb). In my understanding of

http://www.unidata.ucar.edu/software/netcdf-java/reference/JarDependencies.html

this dependency is optional if I don't need to read McIDAS AREA files. This work well for normal NetCDF I/O operations. But when trying to invoke the following code:

   NetcdfFile.canOpen("myFile")

on any file that is not a NetCDF file (for example a PNG image), I get the following exception:

    java.lang.NoClassDefFoundError: visad/util/Trace
       at ucar.nc2.iosp.gempack.GempackStationFileIOSP.isValidFile:141
       (...snip...)
       at ucar.nc2.NetcdfFile.canOpen(NetcdfFile.java:412)

I can workaround with a try ... catch block. But is there any chance to have NetcdfFile.canOpen(...) to not check file format that depends on optional JAR files not present on the classpath?

    Regards,

        Martin

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--
*************************************************************
Don Murray                               UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
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• References:
  • [netcdf-java] NoClassDefFoundError in NetcdfFile.canOpen(String)
    • From: Martin Desruisseaux