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https://issues.apache.org/jira/browse/XGC-117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
simon steiner resolved XGC-117.
-------------------------------
Resolution: Won't Fix
> ConcurrentModificationException in ImageCache / ImageCache not thread-safe
> --------------------------------------------------------------------------
>
> Key: XGC-117
> URL: https://issues.apache.org/jira/browse/XGC-117
> Project: XMLGraphicsCommons
> Issue Type: Bug
> Components: general
> Affects Versions: 2.3
> Reporter: Torsten Kuhnhenne
> Priority: Major
>
> When using a single {{FopFactory}} to create multiple {{Fop}} instances that
> are used in different threads I get an {{ConcurrentModificationException}} in
> {{ImageCache#doInvalidURIHouseKeeping}} in line 294.
>
> Source of the problem is the that new HashSet(this.invalidURIs.keySet())
> internaly iterates over the key-set that is backed by the {{HashMap}} and
> when another thread changes the {{HashMap}} the
> {{ConcurrentModificationException}} occurs.
>
> In my opinion there must be synchronized-blocks around each access of the
> {{invalidURIs}} map to solve this problem. The use of a synchronized map can
> not solve this problem.
>
> Stacktrace:
> {code:java}
> Caused by: java.util.ConcurrentModificationException: null
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
> at java.util.HashMap$KeyIterator.next(HashMap.java:1461)
> at java.util.AbstractCollection.addAll(AbstractCollection.java:343)
> at java.util.HashSet.<init>(HashSet.java:119)
> at
> org.apache.xmlgraphics.image.loader.cache.ImageCache.doInvalidURIHouseKeeping(ImageCache.java:294)
> at
> org.apache.xmlgraphics.image.loader.cache.ImageCache.doHouseKeeping(ImageCache.java:290)
> at
> org.apache.xmlgraphics.image.loader.cache.ImageCache.considerHouseKeeping(ImageCache.java:280)
> at
> org.apache.xmlgraphics.image.loader.cache.ImageCache.registerInvalidURI(ImageCache.java:209)
> at
> org.apache.xmlgraphics.image.loader.cache.ImageCache.needImageInfo(ImageCache.java:130)
> 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)
> {code}
> The issue XGC-30 sounds similiar but does not solve the problem.
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