bugGNU Octave - Bugs: bug #45290, calling java from octave:...


bug #45290: calling java from octave: NullPointerException in parameter conversion of string array (cellarray -> String[])

Submitter:  None
Submitted:  Wed 10 Jun 2015 10:17:55 AM UTC
Category:  Interpreter Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Regression
Status:  Fixed Assigned to:  None
Originator Name:  T Herzke Originator Email:  -email is unavailable-
Open/Closed:  * Closed Release:  * 4.0.0
Operating System:  * Any
* Mandatory Fields

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Mon 15 Jun 2015 05:28:42 PM UTC, comment #6: 

Thank you for the very fast fix, Carnë

Philip Nienhuis <philipnienhuis>
Project Member
Mon 15 Jun 2015 01:11:35 AM UTC, comment #5: 

It should be fixed now with http://hg.savannah.gnu.org/hgweb/octave/rev/137f183b7dee

It will be part of the next patch release, i.e., 4.0.1 release.

Carnë Draug <carandraug>
Project Member
Sun 14 Jun 2015 08:00:59 PM UTC, comment #4: 

Be careful please, as the one I found may not be the one at fault but only uncover the actual problem introduced in an earlier changeset.
Perhaps speculation but it has happened before.

Philip Nienhuis <philipnienhuis>
Project Member
Sat 13 Jun 2015 09:10:58 PM UTC, comment #3: 

Thanks for finding that commit.

Based on this comment in that commit

// Note that we do NOT handle char here because they are unboxed
// into a String[], not into a char array

I'd guess that the first if-clause in that commit needs an additional check like

    && ! val.is_char_type()

But as I know nothing about octave internals this is a wild guess.


Fri 12 Jun 2015 07:42:09 PM UTC, comment #2: 

A little "bisecting" ("hg update <cs>" until catching the offending changeset) shows that it is this changeset by Carnë:

Automatically convert octave vectors into java primitive arrays (bug #44882)

that broke this.
I'll cc Carnë

Philip Nienhuis <philipnienhuis>
Project Member
Wed 10 Jun 2015 02:04:43 PM UTC, comment #1: 

Thanks for your bug report, I can confirm this regression on 4.0.0.

Mike Miller <mtmiller>
Project Administrator
Wed 10 Jun 2015 10:17:55 AM UTC, original submission:  

This was working fine in octave 3.8.2, but produces an error in octave 4.0.0. Tested on Linux with self-compiled executable and also on windows using the official binaries.

Steps to reproduce:

runtime = javaMethod('getRuntime','java.lang.Runtime');
process = runtime.exec({'echo','x'})

expected result:
process =
<Java object: java.lang.ProcessImpl>

actual result:
error: [java] java.lang.NullPointerException

The octave error is triggered in libinterp/octave-value/ov-java.cc line 715, where a java exception in the parameter conversion code is detected and reported.



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    Follow 6 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-06-15 carandraug StatusConfirmed Fixed
        Open/ClosedOpen Closed
    2015-06-12 philipnienhuis Carbon-Copy- Added carandraug
    2015-06-10 mtmiller Item GroupIncorrect Result Regression
        StatusNone Confirmed
        Operating SystemGNU/Linux Any

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