Manikanta created FOP-3285:
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Summary: NullPointerException in Xerces DOM (fNodeListCache)
during concurrent access to Renderer Configuration
Key: FOP-3285
URL: https://issues.apache.org/jira/browse/FOP-3285
Project: FOP
Issue Type: Bug
Components: renderer/pdf
Reporter: Manikanta
I am encountering a concurrency issue when using FOP 2.10 in a multi-threaded
Spring Boot environment.
We initialize a singleton FopFactory using FopFactoryBuilder and a
DefaultConfigurationBuilder. When multiple threads attempt to create a new FOP
object using factory.newFop(...) simultaneously, the application crashes with a
NullPointerException inside Xerces.
Stack Trace:
Caused by: java.lang.NullPointerException: Cannot read field "fLength" because
"this.fNodeListCache" is null
at org.apache.xerces.dom.ParentNode.nodeListGetLength(Unknown Source)
at
org.apache.fop.configuration.DefaultConfiguration.getChildren(DefaultConfiguration.java:138)
at
org.apache.fop.render.PrintRendererConfigurator.getCustomFontCollection(PrintRendererConfigurator.java:147)
...
Steps to Reproduce:
1. Create a large fop_config.xml with many <font> entries inside a <renderer>.
2. Initialize FopFactory once using DefaultConfigurationBuilder PDF/A3.
3. Spawn 20+ threads(more than one is enough IG) that immediately call
fopFactory.newFop() and render a PDF.
Suggested Fix/Workaround:
Make FopFactory.newFop() threadsafe
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