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

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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