[jira] [Created] (XGC-120) java.util.ConcurrentModificationException in ImageImplregistry iterator

["Allan Andersen (JIRA)" <ji...@apache.org>]

Allan Andersen created XGC-120:
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             Summary: java.util.ConcurrentModificationException in ImageImplregistry iterator
                 Key: XGC-120
                 URL: https://issues.apache.org/jira/browse/XGC-120
             Project: XMLGraphicsCommons
          Issue Type: Bug
    Affects Versions: 2.3
         Environment: Ubuntu
            Reporter: Allan Andersen


I get this ConcurrentModificationException when running a multithreaded testcase. 

The problem is related to the preloaders (ArrayList) in ImageImplRegistry which isn't threadsafe. Using CopyOnWriteArrayList is a quick solution to the issue.

The other lists/maps are using the same non-threadsafe implementations. CopyOnWriteArrayList and ConcurrentHashMap works better.
{code:java}
Stacktrace:

Caused by: java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
at java.util.ArrayList$Itr.next(ArrayList.java:859)
at org.apache.xmlgraphics.image.loader.spi.ImageImplRegistry$MyIterator.next(ImageImplRegistry.java:267)
at org.apache.xmlgraphics.image.loader.ImageManager.preloadImage(ImageManager.java:175)
at org.apache.xmlgraphics.image.loader.cache.ImageCache.needImageInfo(ImageCache.java:127)
at org.apache.xmlgraphics.image.loader.ImageManager.getImageInfo(ImageManager.java:123)
at org.apache.fop.fo.flow.ExternalGraphic.bind(ExternalGraphic.java:81)
at org.apache.fop.fo.FObj.processNode(FObj.java:126)
at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:291)
at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:179)
at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1073)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:485)
{code}



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