[Octave-bug-tracker] [bug #51845] Variable editor: trying to open Java or COM objects leads to infinite loop & crash

[Philip Nienhuis]

URL:
  <http://savannah.gnu.org/bugs/?51845>

                 Summary: Variable editor: trying to open Java or COM objects
leads to infinite loop & crash
                 Project: GNU Octave
            Submitted by: philipnienhuis
            Submitted on: Fri 25 Aug 2017 03:36:53 PM CEST
                Category: GUI
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: Philip Nienhuis
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Microsoft Windows

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Details:

Provisionally only Windows but I think this also happens on Linux.

Steps to reproduce:

a = javaObject ("java.lang.Double", 1.5);

##right-click a in workspace, or do
openvar (a)

and in the command window we get an endless loop of

:
>> error: [java] java.lang.IllegalArgumentException: not a Java array
error: parse error
>> error: [java] java.lang.IllegalArgumentException: not a Java array
error: parse error
>> error: [java] java.lang.IllegalArgumentException: not a Java array
error: parse error
:


Ctrl-C doesn't help (reliably). Closing Octave's GUI using the close button
does, but then Octave crashes upon exit.

Similar behavior goes to COM objects (in Windows).

I haven't tried this with other objects (classdef etc.) but I suspect there it
will also go wrong.

When the variable Editor was still just a patch I thought that limiting the
function openvar (that is called when right-clicking & selecting "Open in
Variable Editor" in the workspace) to only accept some types of variables
(prvisionally just numeric, cell, text and struct) would be the best option to
avoid this bug.  Later on when the variable Editor could handle more types
openvar could be adapted accordingly.
But I couldn't find out how to get this together (due to lacking C++/Qt
skills).





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