George Lindholm created FOP-3154:
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Summary: Concurrency problem when rendering document
Key: FOP-3154
URL: https://issues.apache.org/jira/browse/FOP-3154
Project: FOP
Issue Type: Bug
Components: renderer/awt
Affects Versions: 2.9
Environment: Windows 11
Java:
openjdk version "1.8.0_312"
openjdk version "17.0.5" 2022-10-18
Reporter: George Lindholm
Attachments: fop.log, tran.xml
Hi,
I've been working on upgrading our ancient use of fop (0.20.5) to the latest
version of xmlgraphics (2.9) but I've been stymied by a concurrency problem
that causes a FOPException
{{org.apache.fop.apps.FOPException: Requested page number is out of range: 0;
only 0 page(s) available.}}
Complicating the issue is that when I try to debug the workflow the problem
does not happen. I've been able to trace part of the flow by using conditional
breakpoints that prints to the console which has helped, but the more
conditionals I put in, the less likely the problem shows up
An extract of the log shows:
I{{{}NFO: table-layout="fixed" and width="auto", but auto-layout not supported
=> assuming width="100%". (See position 201:18){}}}
{{Thread[Thread-4,5,main]PreviewPanel.Reloader.run()}}
{{Thread[AWT-EventQueue-0,6,main]Java2DRenderer.getPageViewport()}}
{{org.apache.fop.apps.FOPException: Requested page number is out of range: 0;
only 0 page(s) available.}}
{{ at
org.apache.fop.render.java2d.Java2DRenderer.getPageViewport(Java2DRenderer.java:421)}}
{{ at
org.apache.fop.render.java2d.Java2DRenderer.getPageImage(Java2DRenderer.java:436)}}
{{ at
org.apache.fop.render.awt.viewer.ImageProxyPanel.paintComponent(ImageProxyPanel.java:123)}}
{{...}}
{{INFO: table-layout="fixed" and width="auto", but auto-layout not supported =>
assuming width="100%". (See position 201:18)}}
{{Thread[Thread-4,5,main]PreviewPanel.setPage()}}
Somehow the AWT thread is dispatched while Reloader.run() is still running so
the data is un-available to render.
I run fop in Eclipse using the arguments: {{-awt tran.xml}}
The only way I've been able to cause the issue is to keep running fop until it
happens.
Any insight would be appreciated
George
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