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From Robert Gurol <robert.gu...@signavio.com>
Subject SVG text and tspan content disappears or gets distorted, restart necessary
Date Wed, 08 May 2013 14:01:36 GMT
Hi all,

my company has been using batik for several years now.

We are using batik for both SVG-to-PNG transcoding, and for rendering done
by Apache FOP 1.1.

The library is used in a running apache web server (see system stats below)
where its functionality may be accessed by multiple users at the same time.

# SYMPTOMS:
After running the system for a while, the text in the output disappears,
loses formatting or overlaps with itself; the corresponding SVG elements
whose content is painted inaccurately are text and tspan. The issue occurs
for all transcoding that is done once it occurred; a restart of the system
(Tomcat) fixes the issue, though only temporarily.

This has happened more frequently recently, I have already spent some time
trying to figure out the reasons.

Unfortunately, I have no exception output or similar (this part of the
system is supposed not to fail; possible Exceptions are ignored), but we
changed logging configuration so I may have more info soon, though I doubt
it considering there is a valid PNG output, though incorrectly rendered.

# SYSTEM:
OS: Debian Squeeze 64 Bit
Java: version 1.6.0_26
JRE: Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
VM: Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)
Server: Tomcat 6.0.35-1+squeeze2
Batik: Version 1.7 (most recent)

# STEPS TAKEN:
I have searched for quite some time, assuming a thread safety / concurrency
issue (like, a Singleton instance changed static variables incorrectly, and
this state pertains until the system is restarted and the static variable
gets re-initialized), so far without success.

I used the FindBugs checker on the batik source, but found no direct hints
as to where there may be defects causing an issue like this; I will present
the FindBugs output in a separate mail, though. I also investigated the
StrokingTextPainter class (implemented as a singleton) which does the
actual text rendering (as far as I can see), but cannot see issues with it.

I'll be glad for any help or pointers,

best regards

Robert


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Robert Gurol
Software Developer
robert.gurol@signavio.com
T +49 30 488 172 50
F +49 30 250 43 747

Signavio GmbH
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