[Octave-bug-tracker] [bug #42710] fieldnames() fails for java classes in dynamic classpath

[Carnë Draug]

URL:
  <http://savannah.gnu.org/bugs/?42710>

                 Summary: fieldnames() fails for java classes in dynamic
classpath
                 Project: GNU Octave
            Submitted by: carandraug
            Submitted on: Tue 08 Jul 2014 18:23:35 GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

The function javafields() is currently deprecated and fieldnames() is
recommended instead. However, fieldnames() fails for classes that are on the
dynamic classpath instead of static path, while javafields() is working fine
for both cases.

The following is using loci_tools.jar which can be downloaded from
http://downloads.openmicroscopy.org/bio-formats/5.0.2/artifacts/loci_tools.jar
just for the sake of an example:


$ wget
http://downloads.openmicroscopy.org/bio-formats/5.0.2/artifacts/loci_tools.jar
[...]
$ octave
octave-cli-3.8.1> javaaddpath ("./loci_tools.jar" );
octave-cli-3.8.1> r = javaObject ('loci.formats.in.ZipReader');
octave-cli-3.8.1> javafields (r)
warning: javafields is obsolete and will be removed from a future version of
Octave, please use fieldnames instead

{
  [1,1] = public static final int loci.formats.IFormatReader.MUST_GROUP
  [1,2] = public static final int loci.formats.IFormatReader.CAN_GROUP
  [1,3] = public static final int loci.formats.IFormatReader.CANNOT_GROUP
  [1,4] = public static final java.lang.String[]
loci.formats.FormatHandler.COMPRESSION_SUFFIXES
}
octave-cli-3.8.1> fieldnames (r)
error: [java] java.lang.ClassNotFoundException: loci.formats.in.ZipReader
error: called from:
error:   /usr/local/share/octave/3.8.1/m/general/fieldnames.m at line 54,
column 15
octave-cli-3.8.1> exit

$ echo './loci_tools.jar' > javaclasspath.txt
$ octave
octave-cli-3.8.1> r = javaObject ('loci.formats.in.ZipReader');
octave-cli-3.8.1> fieldnames (r)
ans = 
{
  [1,1] = public static final int loci.formats.IFormatReader.MUST_GROUP
  [1,2] = public static final int loci.formats.IFormatReader.CAN_GROUP
  [1,3] = public static final int loci.formats.IFormatReader.CANNOT_GROUP
  [1,4] = public static final java.lang.String[]
loci.formats.FormatHandler.COMPRESSION_SUFFIXES
}





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