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Posted to batik-dev@xmlgraphics.apache.org by bu...@apache.org on 2009/05/28 10:43:58 UTC

DO NOT REPLY [Bug 47277] New: Avoid java.awt.HeadlessException when using WMF transcoder functionality

https://issues.apache.org/bugzilla/show_bug.cgi?id=47277

           Summary: Avoid java.awt.HeadlessException when using WMF
                    transcoder functionality
           Product: Batik
           Version: 1.7
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: (RFE) Request For Extension
        AssignedTo: batik-dev@xmlgraphics.apache.org
        ReportedBy: gabriel.gajdos@ipdap.sk


I was using Batik with Jasper with some WMF images.

Everything was working perfectly in my Windows GUI environmenet.
But after deploying to server without available display GUI I got
java.awt.HeadlessException.
Setting -Djava.awt.headless=true was not sufficient.

I started small investigation and I identified the problem:
Toolkit.getDefaultToolkit().getScreenResolution().

I modified two classes (attached AbstractWMFReader and AbstractWMFPainter)
which use this call with a simple workaround.
1. only one call to this method is needed (subsequent calls can use final
static variable already declared).
2. If a HeadlessException is thrown, we assume (hardcoded) resolution 96
(current value from my GUI environment).
I think it is better to have this hardcoded output than thrown exception.

I tested this new classes and result was OK without thrown Exception.

I past my minor changes fot the case that someone else would appreciate
server-side functionality for reading WMF files.

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DO NOT REPLY [Bug 47277] Avoid java.awt.HeadlessException when using WMF transcoder functionality

Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=47277

Helder Magalhães <he...@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #3 from Helder Magalhães <he...@gmail.com> 2009-11-29 03:31:53 UTC ---
(In reply to comment #0)
> Everything was working perfectly in my Windows GUI environmenet.
> But after deploying to server without available display GUI I got
> java.awt.HeadlessException.
> Setting -Djava.awt.headless=true was not sufficient.

I've also confirmed that this is already addressed in issue 42408. The other
patch is more complete in the sense that it allow configuring resolution
through transcoding hints.

I'm marking this issue as a duplicate of that bug, and invite you to help
testing that patch (currently the bug is marked "need info" as it wasn't yet
sufficiently tested).

(The patch I just attached was provided in the sense of easing the comparison
between this and the other bug.)

*** This bug has been marked as a duplicate of bug 42408 ***

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DO NOT REPLY [Bug 47277] Avoid java.awt.HeadlessException when using WMF transcoder functionality

Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=47277

Helder Magalhães <he...@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #23722|0                           |1
        is obsolete|                            |

--- Comment #2 from Helder Magalhães <he...@gmail.com> 2009-11-29 03:27:40 UTC ---
Created an attachment (id=24628)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=24628)
Propose fix

Hi Gabriel,

First of all, thanks for the fix. The suggested form for contributions is
through a patch, though. I've turned your raw file attachment into that. ;-)

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DO NOT REPLY [Bug 47277] Avoid java.awt.HeadlessException when using WMF transcoder functionality

Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=47277





--- Comment #1 from Gabriel Gajdos <ga...@ipdap.sk>  2009-05-28 01:46:53 PST ---
Created an attachment (id=23722)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=23722)
Small changes for classes AbstractWMFReader and AbstractWMFPainter

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