https://issues.apache.org/bugzilla/show_bug.cgi?id=47868
Summary: ConcurrentModificationException in
ImageCache.doInvalidURIHouseKeeping()
Product: XMLGraphicsCommons
Version: Trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Image codecs
AssignedTo: general@xmlgraphics.apache.org
ReportedBy: mercu...@gmx.ch
If an Image in org/apache/xmlgraphics/image/loader/cache/ImageCache.java
expires a ConcurrentModificationException will be thrown.
The cause is method "private void doInvalidURIHouseKeeping()" which loops over
the Map "this.invalidURIs" and then tries to remove an element from this map in
method "private boolean removeInvalidURIIfExpired(String uri, long timestamp)".
To reproduce the error you can add the following method to ImageCacheTestCase.
public void testImageCacheHouseKeeping() {
ImageCache imageCache = new ImageCache(new TimeStampProvider(), new
DefaultExpirationPolicy(1));
imageCache.registerInvalidURI("invalid");
imageCache.registerInvalidURI("invalid2");
try {
Thread.sleep(1200);
} catch (InterruptedException e) {
e.printStackTrace();
}
imageCache.doHouseKeeping();
}
Stacktrace:
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
at java.util.HashMap$EntryIterator.next(HashMap.java:834)
at java.util.HashMap$EntryIterator.next(HashMap.java:832)
at
org.apache.xmlgraphics.image.loader.cache.ImageCache.doInvalidURIHouseKeeping(ImageCache.java:294)
at
org.apache.xmlgraphics.image.loader.cache.ImageCache.doHouseKeeping(ImageCache.java:287)
at
org.apache.xmlgraphics.image.loader.cache.ImageCache.considerHouseKeeping(ImageCache.java:277)
at
org.apache.xmlgraphics.image.loader.cache.ImageCache.registerInvalidURI(ImageCache.java:206)
at
org.apache.xmlgraphics.image.loader.cache.ImageCache.needImageInfo(ImageCache.java:129)
at
org.apache.xmlgraphics.image.loader.ImageManager.getImageInfo(ImageManager.java:112)
at org.apache.fop.fo.flow.ExternalGraphic.bind(ExternalGraphic.java:81)
at org.apache.fop.fo.FObj.processNode(FObj.java:123)
at
org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:282)
at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:171)
at
org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown
Source)
at org.apache.xerces.xinclude.XIncludeHandler.emptyElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at
org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
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